CVE-2026-93748: high-severity vulnerability in kornelski http-cache-semantics
http-cache-semantics through 4.2.0 Cross-User Cache Disclosure via max-stale
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.6%
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Affected products
kornelski · http-cache-semanticsRelated CVEs — kornelski http-cache-semantics
In the same product, most dangerous first.
References
https://github.com/advisories/GHSA-ch52-4w7c-c8xphttps://github.com/github/advisory-database/issues/10139https://github.com/kornelski/http-cache-semanticshttps://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L425-L441https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L603-L623https://github.com/kornelski/http-cache-semantics/issues/56https://github.com/kornelski/http-cache-semantics/issues/56#issuecomment-5975759591https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-user-cache-disclosure-via-max-stale