CVE-2026-93750highCWE-436

CVE-2026-93750: high-severity vulnerability in kornelski http-cache-semantics

http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.2epss 0.4%
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.
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
Affected products
kornelski · http-cache-semantics
Related CVEs — kornelski http-cache-semantics

In the same product, most dangerous first.

CVE-2026-93748HIGHhttp-cache-semantics through 4.2.0 Cross-User Cache Disclosure via max-staleEPSS 0.6%