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CVE-2026-93750

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

8.2 High

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.45%Up 0.1 points since Sep 19, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.2

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

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.

Record
CVE-2026-93750
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-436
Updated
2026-11-02
EUVDEUVD-2026-83255 8.2

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.

Record
EUVD-2026-83255
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-f27v-pv5m-c5g6 8.2

http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches(...

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.

Record
GHSA-f27v-pv5m-c5g6
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-436
Updated
2026-11-02
NVD 8.2

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.

Record
CVE-2026-93750
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-436
Updated
2026-11-02
OSVDEBIAN-CVE-2026-93750 5.9

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.

Record
DEBIAN-CVE-2026-93750
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-93750 8.2

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.

Record
UBUNTU-CVE-2026-93750
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVAZL-103451 No score

CVE-2026-93750 affecting package nodejs-nodemon 2.0.3-5

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.

Record
AZL-103451
Updated
2026-11-05
OSVAZL-103487 No score

CVE-2026-93750 affecting package python-tensorboard 2.16.2-6

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.

Record
AZL-103487
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nodejs-nodemon
Azure Linux:3
 through 2.0.3-5 None known
python-tensorboard
Azure Linux:3
 through 2.16.2-6 None known
node-got
Debian:12
 All versions, plus listed versions
11.8.5+~cs58.13.36-311.8.5+~cs58.13.36-411.8.5+~cs58.13.36-511.8.5+~cs58.13.36-611.8.5+~cs58.13.36-711.8.5+~cs58.13.36-811.8.6+~cs58.13.36-1
 None known
node-got
Debian:13
 All versions, plus listed versions
11.8.5+~cs58.13.36-511.8.5+~cs58.13.36-611.8.5+~cs58.13.36-711.8.5+~cs58.13.36-811.8.6+~cs58.13.36-1
 None known
node-got
Debian:14
 All versions, plus listed versions
11.8.5+~cs58.13.36-511.8.5+~cs58.13.36-611.8.5+~cs58.13.36-711.8.5+~cs58.13.36-811.8.6+~cs58.13.36-1
 None known
node-got
Ubuntu:18.04:LTS
 All versions, plus listed versions
7.1.0-1
 None known
node-got
Ubuntu:20.04:LTS
 All versions, plus listed versions
7.1.0-1
 None known
node-got
Ubuntu:22.04:LTS
 All versions, plus listed versions
11.8.1+~cs53.13.17-311.8.2+~cs58.7.32-211.8.3+~cs58.7.37-1
 None known
node-got
Ubuntu:24.04:LTS
 All versions, plus listed versions
11.8.5+~cs58.13.36-3
 None known
node-got
Ubuntu:26.10
 All versions, plus listed versions
11.8.5+~cs58.13.36-611.8.5+~cs58.13.36-7
 None known
node-got
Ubuntu:26.04:LTS
 All versions, plus listed versions
11.8.5+~cs58.13.36-511.8.5+~cs58.13.36-6
 None known

History

History
RecordedChangedSources
factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-93750 is a high vulnerability (CVSS 8.2) in Kornelski Http-cache-semantics, published September 18, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 38th percentile. No source names a fixed version.

References

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