CVE-2026-77756
CVE-2026-77756 · Apache Tomcat: Transfer-Encoding honored for HTTP/1.0 requests
This page contains facts from public vulnerability sources. Check the original advisory before updating.
This page shows selected source facts. See the linked advisories for the complete description and affected versions.
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
CVSS 3.7 · Low · EPSS 0.3% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
apache tomcat
- Versions
- ≥ 11.0.0-M1, ≤ 11.0.25: Affected (semver)
- ≥ 10.1.0-M1, ≤ 10.1.59: Affected (semver)
- ≥ 9.0.47, ≤ 9.0.121: Affected (semver)
- ≥ 8.5.67, ≤ 8.5.100: Affected (semver)
- ≥ 0, ≤ 7.0.109: Not affected (semver)
No fix published
tomcat10 Debian:12
- Versions
- 10.1.10-1
- 10.1.13-1
- 10.1.14-1
- 10.1.15-1
- 10.1.16-1
- 10.1.20-1
- 10.1.23-1
- 10.1.25-1
- 10.1.25-1~bpo12+1
- 10.1.25-2
- 10.1.30-1
- 10.1.30-1~bpo12+1
- 10.1.31-1
- 10.1.33-1
- 10.1.33-1~bpo12+1
- 10.1.34-0+deb12u1
- 10.1.34-0+deb12u2
- 10.1.34-1
- 10.1.35-1
- 10.1.40-1
- 10.1.40-1~bpo12+1
- 10.1.46-1
- 10.1.52-1
- 10.1.52-1~deb12u1
- 10.1.52-1~deb13u1
- 10.1.52-2
- 10.1.54-1
- 10.1.55-1
- 10.1.55-1~deb12u1
- 10.1.55-1~deb13u1
- 10.1.6-1
- 10.1.6-1+deb12u1
- 10.1.6-1+deb12u2
- 10.1.60-1
- 10.1.7-1
- 10.1.8-1
- 10.1.9-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat10 Debian:13
- Versions
- 10.1.40-1
- 10.1.46-1
- 10.1.52-1
- 10.1.52-1~deb12u1
- 10.1.52-1~deb13u1
- 10.1.52-2
- 10.1.54-1
- 10.1.55-1
- 10.1.55-1~deb12u1
- 10.1.55-1~deb13u1
- 10.1.60-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat10 Debian:14
- Versions
- 10.1.40-1
- 10.1.46-1
- 10.1.52-1
- 10.1.52-1~deb12u1
- 10.1.52-1~deb13u1
- 10.1.52-2
- 10.1.54-1
- 10.1.55-1
- 10.1.55-1~deb12u1
- 10.1.55-1~deb13u1
- Affected ranges
- ECOSYSTEM: < 10.1.60-1
Update to 10.1.60-1
tomcat11 Debian:13
- Versions
- 11.0.11-1
- 11.0.15-1
- 11.0.15-1~deb13u1
- 11.0.18-1
- 11.0.21-1
- 11.0.22-1
- 11.0.22-1~deb13u1
- 11.0.22-2
- 11.0.24-1
- 11.0.6-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat11 Debian:14
- Versions
- 11.0.11-1
- 11.0.15-1
- 11.0.15-1~deb13u1
- 11.0.18-1
- 11.0.21-1
- 11.0.22-1
- 11.0.22-1~deb13u1
- 11.0.22-2
- 11.0.24-1
- 11.0.6-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Debian:12
- Affected ranges
- ECOSYSTEM: < 9.0.70-2
Update to 9.0.70-2
tomcat9 Debian:13
- Affected ranges
- ECOSYSTEM: < 9.0.70-2
Update to 9.0.70-2
tomcat9 Debian:14
- Affected ranges
- ECOSYSTEM: < 9.0.70-2
Update to 9.0.70-2
tomcat6 Ubuntu:Pro:14.04:LTS
- Versions
- 6.0.37-1
- 6.0.39-1
- 6.0.39-1ubuntu0.1
- 6.0.39-1ubuntu0.1+esm1
- 6.0.39-1ubuntu0.1+esm2
- 6.0.39-1ubuntu0.1+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat7 Ubuntu:Pro:14.04:LTS
- Versions
- 7.0.42-1
- 7.0.47-1
- 7.0.50-1
- 7.0.52-1
- 7.0.52-1ubuntu0.1
- 7.0.52-1ubuntu0.3
- 7.0.52-1ubuntu0.6
- 7.0.52-1ubuntu0.7
- 7.0.52-1ubuntu0.8
- 7.0.52-1ubuntu0.9
- 7.0.52-1ubuntu0.10
- 7.0.52-1ubuntu0.11
- 7.0.52-1ubuntu0.13
- 7.0.52-1ubuntu0.14
- 7.0.52-1ubuntu0.15
- 7.0.52-1ubuntu0.16
- 7.0.52-1ubuntu0.16+esm1
- 7.0.52-1ubuntu0.16+esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat8 Ubuntu:Pro:16.04:LTS
- Versions
- 8.0.26-1
- 8.0.28-1
- 8.0.30-1
- 8.0.32-1
- 8.0.32-1ubuntu1
- 8.0.32-1ubuntu1.1
- 8.0.32-1ubuntu1.2
- 8.0.32-1ubuntu1.3
- 8.0.32-1ubuntu1.4
- 8.0.32-1ubuntu1.5
- 8.0.32-1ubuntu1.6
- 8.0.32-1ubuntu1.7
- 8.0.32-1ubuntu1.8
- 8.0.32-1ubuntu1.9
- 8.0.32-1ubuntu1.10
- 8.0.32-1ubuntu1.11
- 8.0.32-1ubuntu1.13
- 8.0.32-1ubuntu1.13+esm1
- 8.0.32-1ubuntu1.13+esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat7 Ubuntu:Pro:16.04:LTS
- Versions
- 7.0.64-1
- 7.0.68-1
- 7.0.68-1ubuntu0.1
- 7.0.68-1ubuntu0.3
- 7.0.68-1ubuntu0.4
- 7.0.68-1ubuntu0.4+esm1
- 7.0.68-1ubuntu0.4+esm2
- 7.0.68-1ubuntu0.4+esm3
- 7.0.68-1ubuntu0.4+esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat8 Ubuntu:Pro:18.04:LTS
- Versions
- 8.5.21-1ubuntu1
- 8.5.29-1
- 8.5.30-1
- 8.5.30-1ubuntu1
- 8.5.30-1ubuntu1.2
- 8.5.30-1ubuntu1.3
- 8.5.30-1ubuntu1.4
- 8.5.39-1ubuntu1~18.04.1
- 8.5.39-1ubuntu1~18.04.2
- 8.5.39-1ubuntu1~18.04.3
- 8.5.39-1ubuntu1~18.04.3+esm1
- 8.5.39-1ubuntu1~18.04.3+esm2
- 8.5.39-1ubuntu1~18.04.3+esm3
- 8.5.39-1ubuntu1~18.04.3+esm4
- 8.5.39-1ubuntu1~18.04.3+esm5
- 8.5.39-1ubuntu1~18.04.3+esm6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Ubuntu:Pro:18.04:LTS
- Versions
- 9.0.16-3~18.04.1
- 9.0.16-3ubuntu0.18.04.1
- 9.0.16-3ubuntu0.18.04.2
- 9.0.16-3ubuntu0.18.04.2+esm1
- 9.0.16-3ubuntu0.18.04.2+esm2
- 9.0.16-3ubuntu0.18.04.2+esm3
- 9.0.16-3ubuntu0.18.04.2+esm4
- 9.0.16-3ubuntu0.18.04.2+esm5
- 9.0.16-3ubuntu0.18.04.2+esm6
- 9.0.16-3ubuntu0.18.04.2+esm7
- 9.0.16-3ubuntu0.18.04.2+esm8
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Ubuntu:Pro:20.04:LTS
- Versions
- 9.0.24-1
- 9.0.27-1
- 9.0.31-1
- 9.0.31-1ubuntu0.1
- 9.0.31-1ubuntu0.2
- 9.0.31-1ubuntu0.3
- 9.0.31-1ubuntu0.4
- 9.0.31-1ubuntu0.5
- 9.0.31-1ubuntu0.6
- 9.0.31-1ubuntu0.7
- 9.0.31-1ubuntu0.8
- 9.0.31-1ubuntu0.9
- 9.0.31-1ubuntu0.9+esm1
- 9.0.31-1ubuntu0.9+esm2
- 9.0.31-1ubuntu0.9+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Ubuntu:Pro:22.04:LTS
- Versions
- 9.0.43-3
- 9.0.54-1
- 9.0.55-1
- 9.0.58-1
- 9.0.58-1ubuntu0.1
- 9.0.58-1ubuntu0.1+esm1
- 9.0.58-1ubuntu0.1+esm2
- 9.0.58-1ubuntu0.1+esm3
- 9.0.58-1ubuntu0.1+esm4
- 9.0.58-1ubuntu0.2
- 9.0.58-1ubuntu0.2+esm1
- 9.0.58-1ubuntu0.2+esm2
- 9.0.58-1ubuntu0.2+esm3
- 9.0.58-1ubuntu0.2+esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat10 Ubuntu:24.04:LTS
- Versions
- 10.1.10-1
- 10.1.14-1
- 10.1.15-1
- 10.1.16-1
- 10.1.16-1ubuntu0.1~esm1
- 10.1.16-1ubuntu0.1~esm2
- 10.1.16-1ubuntu0.1~esm3
- 10.1.16-1ubuntu0.1~esm4
- 10.1.55-1ubuntu2~24.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Ubuntu:24.04:LTS
- Versions
- 9.0.70-1ubuntu1
- 9.0.70-2
- 9.0.70-2ubuntu0.1
- 9.0.70-2ubuntu0.1+esm1
- 9.0.70-2ubuntu0.1+esm2
- 9.0.70-2ubuntu0.1+esm3
- 9.0.118-1~24.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat10 Ubuntu:26.10
- Versions
- 10.1.40-1ubuntu1
- 10.1.54-1
- 10.1.54-1ubuntu1
- 10.1.54-1ubuntu2
- 10.1.55-1ubuntu1
- 10.1.55-1ubuntu2
- 10.1.57~us1-0ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat11 Ubuntu:26.10
- Versions
- 11.0.18-1
- 11.0.22-2
- 11.0.22-2ubuntu1
- 11.0.22-2ubuntu2
- 11.0.24-1ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Ubuntu:26.10
- Versions
- 9.0.115-1
- 9.0.115-1ubuntu1
- 9.0.118-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat10 Ubuntu:26.04:LTS
- Versions
- 10.1.40-1ubuntu1
- 10.1.40-1ubuntu1.26.04.1
- 10.1.55-1ubuntu2~26.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Ubuntu:26.04:LTS
- Versions
- 9.0.95-1ubuntu1
- 9.0.111-1
- 9.0.115-1
- 9.0.115-1ubuntu0.1
- 9.0.118-1~26.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published