| Name | CVE-2026-34483 |
| Description | Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 , which fix the issue. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1133356, 1133357 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| tomcat10 (PTS) | bookworm | 10.1.34-0+deb12u2 | vulnerable |
| bookworm (security) | 10.1.52-1~deb12u1 | vulnerable | |
| trixie (security), trixie | 10.1.52-1~deb13u1 | vulnerable | |
| forky, sid | 10.1.54-1 | fixed | |
| tomcat11 (PTS) | trixie (security), trixie | 11.0.15-1~deb13u1 | vulnerable |
| forky, sid | 11.0.21-1 | fixed | |
| tomcat9 (PTS) | bullseye | 9.0.43-2~deb11u10 | vulnerable |
| bullseye (security) | 9.0.107-0+deb11u2 | fixed | |
| bookworm | 9.0.70-2 | fixed | |
| trixie | 9.0.95-1 | fixed | |
| forky, sid | 9.0.115-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| tomcat10 | source | (unstable) | 10.1.54-1 | 1133356 | ||
| tomcat11 | source | (unstable) | 11.0.21-1 | 1133357 | ||
| tomcat9 | source | (unstable) | 9.0.70-2 |
Starting with 9.0.70-2 src:tomcat9 no longer ships the server stack, using that as the fixed version
Fixed by: https://github.com/apache/tomcat/commit/f9ddc24fcfcdfaea4a6953198d8636aca3e957bc (11.0.21)
Fixed by: https://github.com/apache/tomcat/commit/f22dc2ce6cfda8609ed86816c0d78e1a9cbadb06 (10.1.54)
Fixed by: https://github.com/apache/tomcat/commit/97566842589d0b80de138ca719378861fd017d68 (9.0.117)
https://www.openwall.com/lists/oss-security/2026/04/09/26