{"id":"CVE-2026-93750","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-93750","summary":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte…","details":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","published":"2026-09-18T18:18:33.633","modified":"2026-09-18T18:18:33.633","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/kornelski/http-cache-semantics"},{"type":"WEB","url":"https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L483-L501"},{"type":"WEB","url":"https://github.com/kornelski/http-cache-semantics/issues/57"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-client-cache-disclosure-via-vary-wildcard"},{"type":"WEB","url":"https://github.com/kornelski/http-cache-semantics/issues/57"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-18T18:18:33.633"}}