{"id":"GHSA-ch52-4w7c-c8xp","summary":"http-cache-semantics max-stale handling can disclose cross-user cached responses","details":"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.","aliases":["CVE-2026-93748"],"modified":"2026-10-02T22:45:04.334960361Z","published":"2026-09-18T18:31:44Z","database_specific":{"cwe_ids":["CWE-524"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-02T22:36:42Z","nvd_published_at":"2026-09-18T18:18:33Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93748"},{"type":"WEB","url":"https://github.com/kornelski/http-cache-semantics/issues/56"},{"type":"PACKAGE","url":"https://github.com/kornelski/http-cache-semantics"},{"type":"WEB","url":"https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L425-L441"},{"type":"WEB","url":"https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L603-L623"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-user-cache-disclosure-via-max-stale"}],"affected":[{"package":{"name":"http-cache-semantics","ecosystem":"npm","purl":"pkg:npm/http-cache-semantics"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"4.2.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-ch52-4w7c-c8xp/GHSA-ch52-4w7c-c8xp.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"CVSS_V4","score":"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"}]}