CVE-2026-93750 http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard
Attackers can retrieve cached responses intended for other users due to flawed Vary header validation, leading to cross-client information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-93750?
CVE-2026-93750 is a high-severity vulnerability in kornelski http-cache-semantics, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-436
Which versions are affected by CVE-2026-93750?
How do I fix CVE-2026-93750?
No fix has been published for CVE-2026-93750 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-93750 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-93750 exists.
Sources
Also known as AZL-103451, AZL-103487, DEBIAN-CVE-2026-93750, GHSA-f27v-pv5m-c5g6, UBUNTU-CVE-2026-93750.