CVE-2026-77762
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat allows an attacker to inject trailer fields into another HTTP/2 request. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.39 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60, 9.0.122, which fix the issue.
- Score
- CVSS 3.1 8.1 High
- Status
- Awaiting Analysis - security@apache.org
- Published
- 2026-09-23
- Last modified
- 2026-09-30
- Weaknesses
- CWE-362
Affected products
References
- https://lists.apache.org/thread/y5r9fvjo7ol24mkoyoc0st8bqrfyqcyn
- http://www.openwall.com/lists/oss-security/2026/09/23/23
