CVE-2026-77762
Description
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.
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Apache Software Foundation Apache Tomcat | 11.0.0-M1 ≤ v ≤ 11.0.25, 10.1.0-M1 ≤ v ≤ 10.1.59, 9.0.39 ≤ v ≤ 9.0.121, 8.5.59 ≤ v ≤ 8.5.100 | — |
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