CVE-2026-93748
http-cache-semantics through 4.2.0 Cross-User Cache Disclosure via max-stale
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
http-cache-semantics through 4.2.0 Cross-User Cache Disclosure via max-stale
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
- Record
CVE-2026-93748- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-524
- Updated
- 2026-11-05
EUVDEUVD-2026-83253
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
- Record
EUVD-2026-83253- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N - Updated
- 2026-11-05
GitHub AdvisoriesGHSA-ch52-4w7c-c8xp
Withdrawn Advisory: http-cache-semantics max-stale handling can disclose cross-user cached responses
Withdrawn Advisory
This advisory has been withdrawn because it's not a valid vulnerability. This link is maintained to preserve external references.
Original Description
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
- Record
GHSA-ch52-4w7c-c8xp- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-524
- Updated
- 2026-11-02
NVD
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
- Record
CVE-2026-93748- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/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
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-524
- Updated
- 2026-11-05
OSVDEBIAN-CVE-2026-93748
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
- Record
DEBIAN-CVE-2026-93748- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/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 - Updated
- 2026-11-06
OSVGHSA-ch52-4w7c-c8xp
Withdrawn Advisory: http-cache-semantics max-stale handling can disclose cross-user cached responses
Withdrawn Advisory
This advisory has been withdrawn because it's not a valid vulnerability. This link is maintained to preserve external references.
Original Description
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
- Record
GHSA-ch52-4w7c-c8xp- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-524
- Updated
- 2026-11-02
Show 6 moreShow less
OSVUBUNTU-CVE-2026-93748
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
- Record
UBUNTU-CVE-2026-93748- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVAZL-103448 No score
CVE-2026-93748 affecting package nodejs-nodemon 2.0.3-5
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
- Record
AZL-103448- Updated
- 2026-11-05
OSVAZL-103485 No score
CVE-2026-93748 affecting package python-tensorboard 2.16.2-6
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
- Record
AZL-103485- Updated
- 2026-11-02
OSVCLSA-2026-1792231034 No score
TuxCare security update for http-cache-semantics (1 CVE)
TuxCare rebuilt http-cache-semantics to address 1 CVE. Fixed in 3.8.1-tuxcare.4.
- Record
CLSA-2026-1792231034- Updated
- 2026-11-02
OSVCLSA-2026-1792743662 No score
TuxCare security update for http-cache-semantics (1 CVE)
TuxCare rebuilt http-cache-semantics to address 1 CVE. Fixed in 4.2.0-tuxcare.1.
- Record
CLSA-2026-1792743662- Updated
- 2026-11-02
OSVROOT-APP-NPM-CVE-2026-93748 No score
CVE-2026-93748 in http-cache-semantics - Patched by Root
Root has patched CVE-2026-93748 in the http-cache-semantics package for Root:npm. Multiple fixed versions available.
- Record
ROOT-APP-NPM-CVE-2026-93748- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
nodejs-nodemonAzure Linux:3 |
through 2.0.3-5 | None known |
python-tensorboardAzure Linux:3 |
through 2.16.2-6 | None known |
http-cache-semanticsTuxCare:npm |
3.8.1-tuxcare.0 up to 3.8.1-tuxcare.4, plus listed versions 3.8.13.8.1-tuxcare.13.8.1-tuxcare.23.8.1-tuxcare.3 |
3.8.1-tuxcare.4 |
http-cache-semanticsTuxCare:npm |
4.2.0-tuxcare.0 up to 4.2.0-tuxcare.1, plus listed versions 4.2.0 |
4.2.0-tuxcare.1 |
node-gotDebian: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-gotDebian: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-gotDebian: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 |
http-cache-semanticsRoot:npm |
before 3.8.1-aikido.3 | 3.8.1-aikido.34.2.0-aikido.14.1.1-aikido.1 |
@rootio/http-cache-semanticsRoot:npm |
before 3.8.1-root.io.3 | 3.8.1-root.io.34.2.0-root.io.14.1.1-root.io.1 |
node-gotUbuntu:18.04:LTS |
All versions, plus listed versions 7.1.0-1 |
None known |
Show 5 moreShow less
| Package | Affected | Fixed |
|---|---|---|
node-gotUbuntu:20.04:LTS |
All versions, plus listed versions 7.1.0-1 |
None known |
node-gotUbuntu: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-gotUbuntu:24.04:LTS |
All versions, plus listed versions 11.8.5+~cs58.13.36-3 |
None known |
node-gotUbuntu:26.10 |
All versions, plus listed versions 11.8.5+~cs58.13.36-611.8.5+~cs58.13.36-7 |
None known |
node-gotUbuntu:26.04:LTS |
All versions, plus listed versions 11.8.5+~cs58.13.36-511.8.5+~cs58.13.36-6 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts, references | CVE List, EUVD, OSV | |
| affected | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-93748 is a high vulnerability (CVSS 8.7) 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 0.60%, the 48th percentile. Fixed in http-cache-semantics 3.8.1-tuxcare.4.
References
github.com/kornelski/http-cache-semantics/issues/56
vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-user-cache-disclosure-via-max-stale