CVE Explorer
CVE-2026-9679
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 inj
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","packageURL":"pkg:npm/undici","product":"undici","vendor":"undici","versions":[{"lessThan":"6.26.0","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"6.26.0","versionType":"semver"},{"lessThan":"7.28.0","status":"affected","version":"7.0.0","versionType":"semver"},{"status":"unaffected","version":"7.28.0","versionType":"semver"},{"lessThan":"8.5.0","status":"affected","version":"8.0.0","versionType":"semver"},{"status":"unaffected","version":"8.5.0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:99ee35f1c28077875060fd709dd2b018f701730c48e7641afc119cf387bc3ef8 · sha256:c72974472c93731e… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"baseScore":5.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:99ee35f1c28077875060fd709dd2b018f701730c48e7641afc119cf387bc3ef8 · sha256:c72974472c93731e… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-93","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:99ee35f1c28077875060fd709dd2b018f701730c48e7641afc119cf387bc3ef8 · sha256:c72974472c93731e… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"url":"https://cna.openjsf.org/security-advisories.html"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:99ee35f1c28077875060fd709dd2b018f701730c48e7641afc119cf387bc3ef8 · sha256:c72974472c93731e… · /containers/cna/references/1
{"url":"https://github.com/nodejs/undici/security/advisories/GHSA-p88m-4jfj-68fv"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:99ee35f1c28077875060fd709dd2b018f701730c48e7641afc119cf387bc3ef8 · sha256:c72974472c93731e… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.