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CVE-2026-29146: Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration. This issue aff

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HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-29146 is a high-severity flaw (CVSS 7.5) affecting tomcat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.0.0-M1 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.19, 10.1.53 and 9.0.116, which fixes the issue.

Why this priority

  • High severity
  • EPSS top 5%: very likely to be exploited
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance8.8% (top 5%)
CISA exploited listNo
WeaknessCWE-209, CWE-642, CWE-1240
Published2026-04-09
Last modified2026-10-26
Publisher (CNA): Apache Software Foundation · Vendor: apache

Share: LinkedIn · X · Reddit

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

apache tomcat UPGRADE
Affected: >= 7.0.100 and <= 7.0.109 · >= 8.5.38 and <= 8.5.100 · >= 9.0.13 and < 9.0.116 · >= 10.0.0 and < 10.1.53 · >= 11.0.0 and < 11.0.20
Fixed in: 9.0.116, 10.1.53, 11.0.20
Safe to downgrade to: a release before 7.0.100
1. Check installed version
apt-cache policy tomcat || rpm -q tomcat || tomcat --version
2. UPGRADE to 9.0.116 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade tomcat
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade tomcat
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 7.0.100 (Debian / Ubuntu)
apt-cache madison tomcat sudo apt install tomcat=<VERSION_BEFORE_7.0.100> sudo apt-mark hold tomcat
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list tomcat sudo dnf downgrade tomcat-<VERSION_BEFORE_7.0.100> sudo dnf versionlock add tomcat
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Maven · org.apache.tomcat:tomcat · FIXED · 9.0.116 · vulnerable: >= 9.0.13, < 9.0.116 · source
Set org.apache.tomcat:tomcat to 9.0.116 or later in pom.xml or build.gradle, then rebuild and redeploy.
Maven · org.apache.tomcat:tomcat-tribes · FIXED · 9.0.116 · vulnerable: >= 9.0.13, < 9.0.116 · source
Set org.apache.tomcat:tomcat-tribes to 9.0.116 or later in pom.xml or build.gradle, then rebuild and redeploy.
Debian 12 · tomcat10 · FIXED · 10.1.55-1~deb12u1
sudo apt update && sudo apt install --only-upgrade tomcat10 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' tomcat10)" ge "10.1.55-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · tomcat10 · FIXED · 10.1.55-1~deb13u1
sudo apt update && sudo apt install --only-upgrade tomcat10 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' tomcat10)" ge "10.1.55-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · tomcat11 · FIXED · 11.0.22-1~deb13u1
sudo apt update && sudo apt install --only-upgrade tomcat11 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' tomcat11)" ge "11.0.22-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · tomcat9 · FIXED · 9.0.70-2
sudo apt update && sudo apt install --only-upgrade tomcat9 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' tomcat9)" ge "9.0.70-2" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · tomcat · FIXED · tomcat-10.1.49-3.el10_2
sudo dnf upgrade --advisory=RHSA-2026:36788 rpm -q tomcat
RHEL 10 · tomcat9 · FIXED · tomcat9-9.0.117-2.el10_2
sudo dnf upgrade --advisory=RHSA-2026:36790 rpm -q tomcat9
RHEL 10.0 Extended Update Support · tomcat · FIXED · tomcat-10.1.36-2.el10_0
sudo dnf upgrade --advisory=RHSA-2026:36787 rpm -q tomcat
RHEL 10.0 Extended Update Support · tomcat9 · FIXED · tomcat9-9.0.87-6.el10_0
sudo dnf upgrade --advisory=RHSA-2026:36789 rpm -q tomcat9
RHEL 7 Extended Lifecycle Support · tomcat · FIXED · tomcat-7.0.76-18.el7_9
sudo dnf upgrade --advisory=RHSA-2026:38505 rpm -q tomcat
Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1673 · source
sudo dnf update --advisory=ALAS2023-2026-1673

Advisories and coverage

Official advisories

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-29146?

tomcat: upgrade to 9.0.116, 10.1.53, 11.0.20. Exact commands for each OS are on this page.

Is CVE-2026-29146 being exploited?

CVE-2026-29146 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-29146 affect?

CVE-2026-29146 affects tomcat. Severity is high (CVSS 7.5). Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.0.0-M1 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 throug

How urgent is CVE-2026-29146?

Priority 60/100. High severity; EPSS top 5%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache Tomcat vulnerabilities

Related CVEs

References

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