CVE-2026-77762

Apache Tomcat: Stale HPACK emitter injects trailers into recycled pooled Request

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.

Scores

Faiblesses (CWE)

• CWE-362

Références européennes

• ENISA EUVD · EUVD-2026-85227
• GCVE · GCVE-0-2026-77762

Avis du CERT-FR

• CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1336 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1218 — Multiples vulnérabilités dans Apache Tomcat · cert.ssi.gouv.fr

Produits affectés

Références

• https://lists.apache.org/thread/y5r9fvjo7ol24mkoyoc0st8bqrfyqcyn
• http://www.openwall.com/lists/oss-security/2026/09/23/23

Sources