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CVE-2025-31650: Improper Input Validation vulnerability in Apache Tomcat

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HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2025-31650 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.

Improper Input Validation vulnerability in Apache Tomcat. Incorrect error handling for some invalid HTTP priority headers resulted in incomplete clean-up of the failed request which created a memory leak. A large number of such requests could trigger an OutOfMemoryException resulting in a denial of service. This issue affects Apache Tomcat: from 9.0.76 through 9.0.102, from 10.1.10 through 10.1.39, from 11.0.0-M2 through 11.0.5. The following ve

Why this priority

  • High severity
  • EPSS top 1%: very likely to be exploited
  • Public exploit reference
  • 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 chance61.3% (top 1%)
CISA exploited listNo
WeaknessCWE-459
Published2025-04-28
Last modified2026-06-17
Publisher (CNA): Apache Software Foundation · Vendor: apache

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

apache tomcat UPGRADE
Affected: >= 9.0.76 and < 9.0.104 · >= 10.1.10 and < 10.1.40 · >= 11.0.1 and < 11.0.6 · 11.0.0 milestone10 · 11.0.0 milestone11 · 11.0.0 milestone12 · 11.0.0 milestone13 · 11.0.0 milestone14
Fixed in: 9.0.104, 10.1.40, 11.0.6
Safe to downgrade to: a release before 9.0.76
1. Check installed version
apt-cache policy tomcat || rpm -q tomcat || tomcat --version
2. UPGRADE to 9.0.104 (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 9.0.76 (Debian / Ubuntu)
apt-cache madison tomcat sudo apt install tomcat=<VERSION_BEFORE_9.0.76> 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_9.0.76> 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-coyote · FIXED · 9.0.104 · vulnerable: >= 9.0.76, <= 9.0.102 · source
Set org.apache.tomcat:tomcat-coyote to 9.0.104 or later in pom.xml or build.gradle, then rebuild and redeploy.
Maven · org.apache.tomcat.embed:tomcat-embed-core · FIXED · 9.0.104 · vulnerable: >= 9.0.76, <= 9.0.102 · source
Set org.apache.tomcat.embed:tomcat-embed-core to 9.0.104 or later in pom.xml or build.gradle, then rebuild and redeploy.
Fedora ELN · ibus-typing-booster · FIXED · 2.31.3-1.eln159 · FEDORA-2026-c895c68d60 · source
sudo dnf upgrade --advisory=FEDORA-2026-c895c68d60
Fedora 46 · perl-WWW-OrangeHRM-Client · FIXED · 0.12.0-21.fc46 · FEDORA-2026-2d14efca09 · source
sudo dnf upgrade --advisory=FEDORA-2026-2d14efca09
Ubuntu 20.04 · tomcat9 · NOT AFFECTED
Ubuntu 22.04 · tomcat9 · NOT AFFECTED
Ubuntu 24.04 · tomcat9 · NOT AFFECTED
Ubuntu 24.10 · tomcat9 · NOT AFFECTED
Ubuntu 25.04 · tomcat9 · NOT AFFECTED
Debian 12 · tomcat10 · FIXED · 10.1.40-1
sudo apt update && sudo apt install --only-upgrade tomcat10 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' tomcat10)" ge "10.1.40-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · tomcat10 · FIXED · 10.1.40-1
sudo apt update && sudo apt install --only-upgrade tomcat10 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' tomcat10)" ge "10.1.40-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · tomcat11 · FIXED · 11.0.6-1
sudo apt update && sudo apt install --only-upgrade tomcat11 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' tomcat11)" ge "11.0.6-1" && 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 · tomcat9 · FIXED · tomcat9-9.0.87-5.el10_0.1
sudo dnf upgrade --advisory=RHSA-2025:11332 rpm -q tomcat9
RHEL 10 · tomcat · FIXED · tomcat-10.1.49-1.el10
sudo dnf upgrade --advisory=RHSA-2026:18537 rpm -q tomcat
RHEL 8 · tomcat · FIXED · tomcat-9.0.87-1.el8_10.4
sudo dnf upgrade --advisory=RHSA-2025:11333 rpm -q tomcat
RHEL 8.8 Telecommunications Update Service · tomcat · FIXED · tomcat-9.0.87-1.el8_8.5
sudo dnf upgrade --advisory=RHSA-2025:11382 rpm -q tomcat
RHEL 8.8 Update Services for SAP Solutions · tomcat · FIXED · tomcat-9.0.87-1.el8_8.5
sudo dnf upgrade --advisory=RHSA-2025:11382 rpm -q tomcat
Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2025-965 · source
sudo dnf update --advisory=ALAS2023-2025-965

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

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-2025-31650?

tomcat: upgrade to 9.0.104, 10.1.40, 11.0.6. Exact commands for each OS are on this page.

Is CVE-2025-31650 being exploited?

CVE-2025-31650 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-2025-31650 affect?

CVE-2025-31650 affects tomcat. Severity is high (CVSS 7.5). Improper Input Validation vulnerability in Apache Tomcat. Incorrect error handling for some invalid HTTP priority headers resulted in incomplete clean-up of the failed request which created a memory leak. A large number of such requests cou

How urgent is CVE-2025-31650?

Priority 66/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache Tomcat vulnerabilities

Related CVEs

References

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