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Open Redirect CVE-2026-9679

| EUVDEUVD-2026-37764 MEDIUM
Improper Neutralization of CRLF Sequences ('CRLF Injection') (CWE-93)
2026-06-17 openjs GHSA-p88m-4jfj-68fv
Open Redirect Undici Red Hat Suse
5.9
CVSS 3.1 · Vendor: openjs
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Severity by source

Vendor (openjs) PRIMARY
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
SUSE
MEDIUM
qualitative
Red Hat
5.9 MEDIUM
qualitative

Primary rating from Vendor (openjs).

CVSS VectorVendor: openjs

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

2
Patch available
Jun 19, 2026 - 16:01 EUVD
Analysis Generated
Jun 17, 2026 - 18:09 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 28 npm packages depend on undici (16 direct, 23 indirect)

Ecosystem-wide dependent count for version 7.0.0.

DescriptionCVE.org

Impact: undici's cookie parser in parseSetCookie percent-decodes cookie values via qsUnescape, turning encoded sequences like %0D%0A, %00, %3B, and %3D into their literal byte equivalents. RFC 6265 §5.4 does not specify any decoding and browsers do not decode either.

Applications that parse a Set-Cookie header and then forward the parsed value into a response header (proxies, middleware, SSR frameworks) become vulnerable to HTTP response header injection: an attacker-controlled upstream can inject arbitrary Set-Cookie, Location, or Cache-Control headers into the application's downstream response, enabling session fixation, open redirect, or cache poisoning.

Affected applications are those that use undici's cookie parsing (parseSetCookie, parseCookie, getSetCookies) and forward the parsed cookie value into a response header.

This was introduced in undici 7.0.0 via PR #3789.

Patches: Upgrade to undici v6.26.0, v7.28.0 or v8.5.0.

Workarounds: If upgrade is not immediately possible, do not forward values returned by parseSetCookie/parseCookie/getSetCookies directly into response headers; sanitize the value first to strip or reject CR, LF, NUL, ;, and = bytes.

AnalysisAI

HTTP response header injection in undici's cookie parser exposes proxy, middleware, and SSR framework applications to session fixation, open redirect, and cache poisoning. The parseSetCookie, parseCookie, and getSetCookies functions incorrectly percent-decode cookie values using qsUnescape, converting encoded sequences such as %0D%0A into literal CRLF bytes in violation of RFC 6265 §5.4, which prescribes no such decoding. Any application that fetches from an attacker-controlled upstream and forwards the parsed cookie value into a downstream response header is exploitable; no public exploit has been identified at time of analysis, and patched releases v6.26.0, v7.28.0, and v8.5.0 are available.

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Same weakness CWE-93 – Improper Neutralization of CRLF Sequences ('CRLF Injection')

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Web and Scripting 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP6-LTSS Fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP6 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected

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CVE-2026-9679 vulnerability details – vuln.today
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