CVE-2026-93750
CVE-2026-93750
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (38.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Weakness classification (CWE)
References
- github.com/kornelski/http-cache-semantics/issues/57 (issue-tracking)
- github.com/kornelski/http-cache-semantics (product)
- github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e… (technical-description)
- www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-client-ca… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-93750?
- CVE-2026-93750 is a medium-severity vulnerability, classified under CWE-436. CVSS score: 5.9/10. Published 2026-09-18.
- How severe is CVE-2026-93750?
- Medium severity. CVSS v3 base score is 5.9 out of 10.