[thredds] Fwd: [SECURITY] CVE-2025-31650 Apache Tomcat - DoS via invalid HTTP prioritization header

• To: THREDDS community <thredds@xxxxxxxxxxxxxxxx>
• Subject: [thredds] Fwd: [SECURITY] CVE-2025-31650 Apache Tomcat - DoS via invalid HTTP prioritization header
• From: Jennifer Oxelson Ganter <oxelson@xxxxxxxx>
• Date: Mon, 28 Apr 2025 14:22:03 -0600

Hi all,

A couple of new Tomcat CVEs, including one of high severity, were just
announced.

---------- Forwarded message ---------
From: Mark Thomas <markt@xxxxxxxxxx>
Date: Mon, Apr 28, 2025 at 1:14 PM
Subject: [SECURITY] CVE-2025-31650 Apache Tomcat - DoS via invalid HTTP
prioritization header
To: Tomcat Users List <users@xxxxxxxxxxxxxxxxx>
Cc: <announce@xxxxxxxxxx>, announce@xxxxxxxxxxxxxxxxx <
announce@xxxxxxxxxxxxxxxxx>, Tomcat Developers List <dev@xxxxxxxxxxxxxxxxx>


CVE-2025-31650 Apache Tomcat - DoS via invalid HTTP prioritization header

Severity: High

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 11.0.0-M2 to 11.0.5
Apache Tomcat 10.1.10 to 10.1.39
Apache Tomcat 9.0.76 to 9.0.102

Description:
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.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.6 or later
- Upgrade to Apache Tomcat 10.1.40 or later
- Upgrade to Apache Tomcat 9.0.104 or later

Note: This issue was fixed in Apache Tomcat 9.0.103 but the release vote
for the 9.0.103 release candidate did not pass. Therefore, although
users must download 9.0.104 to obtain a version that includes a fix for
this issue, version 9.0.103 is not included in the list of affected
versions.

Credit:
The vulnerability was identified by the Tomcat security team.

History:
2025-04-28 Original advisory

References:
[1] https://tomcat.apache.org/security-11.html
[2] https://tomcat.apache.org/security-10.html
[3] https://tomcat.apache.org/security-9.html


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Jennifer Oxelson Ganter                                       NSF Unidata
Software Engineer IV                                          P.O. Box 3000
oxelson@xxxxxxxx                                       Boulder, CO 80307
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