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🛡️ CVE-2025-31650 — tomcat

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-459 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Apache Tomcat Denial of Service via invalid HTTP priority header

Improper Input Validation vulnerability in Apache Tomcat. Incorrect error handling for some invalid HTTP priority headers resulted in incomplete clean-up of the failed request which created a memory leak. A large number of such requests could trigger an OutOfMemoryException resulting in a denial of service.

This issue affects Apache Tomcat: from 9.0.76 through 9.0.102, from 10.1.10 through 10.1.39, from 11.0.0-M2 through 11.0.5. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.90 though 8.5.100.

Users are recommended to upgrade to version 9.0.104, 10.1.40 or 11.0.6 which fix the issue.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Attack requirements: None — no deployment-specific condition has to hold.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2025-31650 is classified as CWE-459: Incomplete Cleanup. Temporary state is not fully removed after use, leaving data or resources behind.

Affected software

CVE-2025-31650 is recorded against 3 packages.

  • org.apache.tomcat.embed:tomcat-embed-core (from 8.5.0)
  • org.apache.tomcat:tomcat-coyote (from 8.5.0)
  • tomcat

Timeline and source

Published on 28 April 2025 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
lists.apache.org (Web)
lists.debian.org (Web)
tomcat.apache.org (Web)
tomcat.apache.org (Web)
tomcat.apache.org (Web)
www.openwall.com (Web)

Other advisories for this package

org.apache.tomcat:tomcat-coyote has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-459: Incomplete Cleanup) in other software:

CVE-2025-31650 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 8.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
CWE CWE-459
Public Exploit ✅ No
Source OSV
Published 2025-04-28
Updated 2026-08-20
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
org.apache.tomcat:tomcat-coyote 8.5.0 —
org.apache.tomcat.embed:tomcat-embed-core 8.5.0 —
tomcat — —

References

Site Security Check

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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