CVE-2026-93748
http-cache-semantics through 4.2.0 Cross-User Cache Disclosure via max-stale
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 18, 2026
- Updated
- Oct 14, 2026
- Reserved
- Sep 18, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-524 Use of Cache Containing Sensitive Information
Affected Products
| Product | Versions |
|---|---|
http-cache-semanticskornelski |
|
References
- GitHub Issue #56issue-tracking
- https://github.com/kornelski/http-cache-semanticsproduct
- max-stale stale-serving branch that re-serves a zero-lifetime entrytechnical-description
- maxAge() zeroing for shared Set-Cookie and proxy-revalidate responsestechnical-description
- VulnCheck Advisory: http-cache-semantics through 4.2.0 Cross-User Cache Disclosure via max-stalethird-party-advisory
- https://github.com/kornelski/http-cache-semantics/issues/56#issuecomment-5975759591
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.