CVE-2026-9679Medium· 5.9▾ SunlitA flaw was found in undici. The cookie parser in the `parseSetCookie` function incorrectly decodes cookie values, which is contrary to standard specifications. This vulnerability allows an attacker-controlled upstream to inject arbitrary H…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 32.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.3%
0.3% → 0.3%
Last analysed / modified upstream
A flaw was found in undici. The cookie parser in the parseSetCookie function incorrectly decodes cookie values, which is contrary to standard specifications. This vulnerability allows an attacker-controlled upstream to inject arbitrary HTTP response headers, such as Set-Cookie, Location, or Cache-Control. The primary consequence is HTTP response header injection, which can lead to session fixation, open redirect, or cache poisoning.
undici: undici vulnerable to HTTP header injection via Set-Cookie percent-decoding — rated Moderate by Red Hat. Released 2026-06-17, updated 2026-10-01.
Affected:
Fixed:
No fix planned:
Not affected:
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:38236 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:38009 Before applying this update, make sure all previously released errata relevant to your system have been applied.
For details on how to apply this update, refer to:
https://docs.redhat.com/en/documentation/red_hat_openshift_data_foundation/4.18/html/updating_openshift_data_foundation/updating-ocs-to-odf_rhodf https://access.redhat.com/errata/RHSA-2026:56431
Workarounds / mitigations:
Affected packages:
undici < 6.27.0undici >= 7.0.0, < 7.28.0undici >= 8.0.0, < 8.5.0Patched in:
undici 6.27.0undici 7.28.0undici 8.5.0Connected by shared product, vendor, weakness, or advisory.
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