CVE-2026-93750
http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard
- State
- Published
- Severity
- 8.2 High
- Published
- Sep 18, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 18, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.2 High | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.9 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-436 Interpretation Conflict
Affected Products
| Product | Versions |
|---|---|
http-cache-semanticskornelski |
|
References
- GitHub Issue #57issue-tracking
- https://github.com/kornelski/http-cache-semanticsproduct
- _varyMatches() exact-string wildcard test and unguarded per-field comparisontechnical-description
- VulnCheck Advisory: http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcardthird-party-advisory
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