8.2

CVE-2026-93750: http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard

Deferred
AliasesUBUNTU-CVE-2026-93750DEBIAN-CVE-2026-93750CGA-m5vc-cxgg-g586
Published 18-09-2026Last modified 24-09-2026

Vulnerability summary

CVE-2026-93750 is a high (CVSS 8.2) Interpretation Conflict vulnerability in kornelski http-cache-semantics. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 38.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.2 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.45%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 18-09-2026
    PublishedVulnerability first disclosed.
  2. 24-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.45% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard1 product
  • npm-12All versions (No fix recorded)
Debian1 product
  • node-gotAll versions (No fix recorded)
Kornelski1 product
Ubuntu1 product
  • node-gotAll versions (No fix recorded)
Wolfi1 product
  • npm-12All versions (No fix recorded)

5 vendors · 5 products

References

7 links