Skip to content

Update dependency undici to v6.24.0 [SECURITY]#1202

Open
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-undici-vulnerability
Open

Update dependency undici to v6.24.0 [SECURITY]#1202
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-undici-vulnerability

Conversation

@renovate
Copy link
Copy Markdown
Contributor

@renovate renovate Bot commented Jan 15, 2026 •
edited
Loading

This PR contains the following updates:

Package Change Age Adoption Passing Confidence
undici (source) 6.21.2 → 6.24.0 age adoption passing confidence

Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion

CVE-2026-22036 / GHSA-g9mf-h72j-4rw9

More information

Details

Impact

The fetch() API supports chained HTTP encoding algorithms for response content according to RFC 9110 (e.g., Content-Encoding: gzip, br). This is also supported by the undici decompress interceptor.

However, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation.

Patches

Upgrade to 7.18.2 or 6.23.0.

Workarounds

It is possible to apply an undici interceptor and filter long Content-Encoding sequences manually.

References

Severity

  • CVSS Score: 5.9 / 10 (Medium)
  • Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Undici: Malicious WebSocket 64-bit length overflows parser and crashes the client

CVE-2026-1528 / GHSA-f269-vfmq-vjvj

More information

Details

Impact

A server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process.

Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Workarounds

There are no workarounds.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Undici has an HTTP Request/Response Smuggling issue

CVE-2026-1525 / GHSA-2mjp-6q6p-2qxm

More information

Details

Impact

Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire.

Who is impacted:

  • Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as flat arrays
  • Applications that accept user-controlled header names without case-normalization

Potential consequences:

  • Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-Length headers (400 Bad Request)
  • HTTP Request Smuggling: In deployments where an intermediary and backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential hijacking
Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Workarounds

If upgrading is not immediately possible:

  1. Validate header names: Ensure no duplicate Content-Length headers (case-insensitive) are present before passing headers to undici
  2. Use object format: Pass headers as a plain object ({ 'content-length': '123' }) rather than an array, which naturally deduplicates by key
  3. Sanitize user input: If headers originate from user input, normalize header names to lowercase and reject duplicates

Severity

  • CVSS Score: 6.5 / 10 (Medium)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Undici has Unhandled Exception in WebSocket Client Due to Invalid server_max_window_bits Validation

CVE-2026-2229 / GHSA-v9p9-hfj2-hcw8

More information

Details

Impact

The undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range server_max_window_bits value (outside zlib's valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination.

The vulnerability exists because:

  1. The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15
  2. The createInflateRaw() call is not wrapped in a try-catch block
  3. The resulting exception propagates up through the call stack and crashes the Node.js process
Patches

Has the problem been patched? What versions should users upgrade to?

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Undici has Unbounded Memory Consumption in WebSocket permessage-deflate Decompression

CVE-2026-1526 / GHSA-vrm6-8vpv-qv8q

More information

Details

Description

The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive.

The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold.

Impact
  • Remote denial of service against any Node.js application using undici's WebSocket client
  • A single compressed WebSocket frame of ~6 MB can decompress to ~1 GB or more
  • Memory exhaustion occurs in native/external memory, bypassing V8 heap limits
  • No application-level mitigation is possible as decompression occurs before message delivery
Patches

Users should upgrade to fixed versions.

Workarounds

No workaround are possible.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Undici has CRLF Injection in undici via upgrade option

CVE-2026-1527 / GHSA-4992-7rv2-5pvq

More information

Details

Impact

When an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  1. Inject arbitrary HTTP headers
  2. Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)

The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121
if (upgrade) {
  header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n`
}
Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Workarounds

Sanitize the upgrade option string before passing to undici:

function sanitizeUpgrade(value) {
  if (/[\r\n]/.test(value)) {
    throw new Error('Invalid upgrade value')
  }
  return value
}

client.request({
  upgrade: sanitizeUpgrade(userInput)
})

Severity

  • CVSS Score: 4.6 / 10 (Medium)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

nodejs/undici (undici)

v6.24.0

Compare Source

Undici v6.24.0 Security Release Notes (LTS)

This release backports fixes for security vulnerabilities affecting the v6 line.

Upgrade guidance

All users on v6 should upgrade to v6.24.0 or later.

Fixed advisories

Not applicable to v6

Affected and patched ranges (v6)

References

v6.23.0

Compare Source

Full Changelog: nodejs/undici@v6.22.0...v6.23.0

v6.22.0

Compare Source

What's Changed

Full Changelog: nodejs/undici@v6.21.3...v6.22.0

v6.21.3

Compare Source

What's Changed

Full Changelog: nodejs/undici@v6.21.2...v6.21.3

Configuration

📅 Schedule: (UTC)

  • Branch creation
    • ""
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

@socket-security
Copy link
Copy Markdown

socket-security Bot commented Jan 15, 2026 •
edited
Loading

Caution

Review the following alerts detected in dependencies.

According to your organization's Security Policy, you must resolve all "Block" alerts before proceeding. Learn more about Socket for GitHub.

Action Severity Alert  (click "▶" to expand/collapse)
Block Low
Potential code anomaly (AI signal): npm chownr is 100.0% likely to have a medium risk anomaly

Notes: The code represents a standard, well-scoped recursive ownership utility with deliberate cross-version compatibility. No evidence of malicious activity, data leakage, or external communications. The main risk is the potential for broad permission changes if invoked with untrusted uid/gid values; usage should be restricted to trusted contexts.

Confidence: 1.00

Severity: 0.60

From: ? → npm/ava@6.1.3 → npm/chownr@2.0.0

ℹ Read more on: This package | This alert | What is an AI-detected potential code anomaly?

Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev.

Suggestion: An AI system found a low-risk anomaly in this package. It may still be fine to use, but you should check that it is safe before proceeding.

Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/chownr@2.0.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

Block Low
Potential code anomaly (AI signal): npm delayed-stream is 100.0% likely to have a medium risk anomaly

Notes: The DelayedStream module intercepts and buffers events from a source stream. While the core functionality appears to be for stream delay and management, two aspects raise concern: the overriding of the source's emit method and the attachment of a silent error handler (source.on('error', function() {})). The silent error handler is particularly suspicious as it can mask underlying problems or potential malicious activity originating from the source stream. Without further context on why errors are being suppressed, this behavior warrants caution. The code itself does not exhibit direct malware patterns like network exfiltration or reverse shells, but the error suppression could be a component of a larger, more covert operation.

Confidence: 1.00

Severity: 0.60

From: ? → npm/@openzeppelin/defender-sdk-deploy-client@2.1.0 → npm/@openzeppelin/defender-sdk-network-client@2.1.0 → npm/delayed-stream@1.0.0

ℹ Read more on: This package | This alert | What is an AI-detected potential code anomaly?

Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev.

Suggestion: An AI system found a low-risk anomaly in this package. It may still be fine to use, but you should check that it is safe before proceeding.

Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/delayed-stream@1.0.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

Block Low
Low CVE: Elliptic allows BER-encoded signatures

CVE: GHSA-49q7-c7j4-3p7m Elliptic allows BER-encoded signatures (LOW)

Affected versions: >= 5.2.1 < 6.5.7

Patched version: 6.5.7

From: ? → npm/hardhat@2.22.9 → npm/@nomicfoundation/hardhat-verify@2.0.14 → npm/elliptic@6.5.4

ℹ Read more on: This package | This alert | What is a mild CVE?

Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev.

Suggestion: Remove or replace dependencies that include known low severity CVEs. Consumers can use dependency overrides or npm audit fix --force to remove vulnerable dependencies.

Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/elliptic@6.5.4. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

Block Low
Low CVE: Elliptic's ECDSA missing check for whether leading bit of r and s is zero

CVE: GHSA-977x-g7h5-7qgw Elliptic's ECDSA missing check for whether leading bit of r and s is zero (LOW)

Affected versions: >= 2.0.0 < 6.5.7

Patched version: 6.5.7

From: ? → npm/hardhat@2.22.9 → npm/@nomicfoundation/hardhat-verify@2.0.14 → npm/elliptic@6.5.4

ℹ Read more on: This package | This alert | What is a mild CVE?

Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev.

Suggestion: Remove or replace dependencies that include known low severity CVEs. Consumers can use dependency overrides or npm audit fix --force to remove vulnerable dependencies.

Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/elliptic@6.5.4. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

Block Low
Low CVE: Elliptic's EDDSA missing signature length check

CVE: GHSA-f7q4-pwc6-w24p Elliptic's EDDSA missing signature length check (LOW)

Affected versions: >= 4.0.0 < 6.5.7

Patched version: 6.5.7

From: ? → npm/hardhat@2.22.9 → npm/@nomicfoundation/hardhat-verify@2.0.14 → npm/elliptic@6.5.4

ℹ Read more on: This package | This alert | What is a mild CVE?

Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev.

Suggestion: Remove or replace dependencies that include known low severity CVEs. Consumers can use dependency overrides or npm audit fix --force to remove vulnerable dependencies.

Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/elliptic@6.5.4. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

Block Low
Low CVE: Elliptic's verify function omits uniqueness validation

CVE: GHSA-434g-2637-qmqr Elliptic's verify function omits uniqueness validation (LOW)

Affected versions: < 6.5.6

Patched version: 6.5.6

From: ? → npm/hardhat@2.22.9 → npm/@nomicfoundation/hardhat-verify@2.0.14 → npm/elliptic@6.5.4

ℹ Read more on: This package | This alert | What is a mild CVE?

Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev.

Suggestion: Remove or replace dependencies that include known low severity CVEs. Consumers can use dependency overrides or npm audit fix --force to remove vulnerable dependencies.

Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/elliptic@6.5.4. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

View full report

@renovate renovate Bot force-pushed the renovate/npm-undici-vulnerability branch from 85e05b1 to aa722e3 Compare March 13, 2026 18:48
@renovate renovate Bot changed the title Update dependency undici to v6.23.0 [SECURITY] Update dependency undici to v6.24.0 [SECURITY] Mar 14, 2026
@renovate renovate Bot changed the title Update dependency undici to v6.24.0 [SECURITY] Update dependency undici to v6.24.0 [SECURITY] - autoclosed Mar 27, 2026
@renovate renovate Bot closed this Mar 27, 2026
@renovate renovate Bot deleted the renovate/npm-undici-vulnerability branch March 27, 2026 01:13
@renovate renovate Bot changed the title Update dependency undici to v6.24.0 [SECURITY] - autoclosed Update dependency undici to v6.24.0 [SECURITY] Mar 30, 2026
@renovate renovate Bot reopened this Mar 30, 2026
@renovate renovate Bot force-pushed the renovate/npm-undici-vulnerability branch 2 times, most recently from aa722e3 to 22b2e26 Compare March 30, 2026 21:53
@renovate renovate Bot force-pushed the renovate/npm-undici-vulnerability branch from 22b2e26 to e58b354 Compare April 29, 2026 13:51
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

No reviews

Assignees

No one assigned

Labels

None yet

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

0 participants