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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.
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
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gzm0
changed the title
chore(deps): update dependency undici to v7.18.2 [security]
Old: chore(deps): update dependency undici to v7.18.2 [security]
Feb 13, 2026
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This PR contains the following updates:
7.16.0→7.18.2GitHub Vulnerability Alerts
CVE-2026-22036
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-Encodingsequences manually.References
Release Notes
nodejs/undici (undici)
v7.18.2Compare Source
What's Changed
Full Changelog: nodejs/undici@v7.18.1...v7.18.2
v7.18.1Compare Source
What's Changed
Full Changelog: nodejs/undici@v7.18.0...v7.18.1
v7.18.0Compare Source
What's Changed
Full Changelog: nodejs/undici@v7.17.0...v7.18.0
v7.17.0Compare Source
What's Changed
'node:'prefix for requiring node built-ins by @Uzlopak in #4547statusinResponse.redirectby @gineika in #4591304 not modifiedreply upon revalidation did not update cache. by @daan944 in #4617New Contributors
Full Changelog: nodejs/undici@v7.16.0...v7.17.0
Configuration
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