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LOW severity

CVE-2026-43514 — tomcat-embed-core

LOWFix: apache/tomcat@933dcdb

CVE-2026-43514 is a low-severity (CVSS 3.7) CWE-208 vulnerability in org.apache.tomcat.embed:tomcat-embed-core. A fix is available for org.apache.tomcat.embed:tomcat-embed-core — see the affected versions and patch details below.

Apache Tomcat: AJP secret compared in non-constant time

Also known asBIT-tomcat-2026-43514GHSA-9m89-8frq-c98c
Published
Updated
Affected
9 pkgs
Patched
9 / 9
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-43514.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs29th percentile — riskier than 29% of all scored CVEsHighest risk
0.00%0.34%0.69%1.03%0.1%0.4%Jun 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

9 pkgs affected
☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat-catalina☕org.apache.tomcat:tomcat-catalina+1 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected

Description: The AJP secret was compared in non-constant time allowing an attacker on the local network to mount a timing attack to determine the AJP secret.

Mitigation: Users of the affected versions should apply one of the following mitigations:

  • Upgrade to Apache Tomcat 11.0.22 or later
  • Upgrade to Apache Tomcat 10.1.55 or later
  • Upgrade to Apache Tomcat 9.0.118 or later

Affected Packages

9 total 9 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.tomcat.embed:tomcat-embed-coreall versions9.0.118org.apache.tomcat.embed:tomcat-embed-core:9.0.118
☕Mavenorg.apache.tomcat.embed:tomcat-embed-core≥ 10.1.0-M1&&< 10.1.5510.1.55org.apache.tomcat.embed:tomcat-embed-core:10.1.55
☕Mavenorg.apache.tomcat.embed:tomcat-embed-core≥ 11.0.0-M1&&< 11.0.2211.0.22org.apache.tomcat.embed:tomcat-embed-core:11.0.22
☕Mavenorg.apache.tomcat:tomcatall versions9.0.118org.apache.tomcat:tomcat:9.0.118
☕Mavenorg.apache.tomcat:tomcat≥ 10.1.0-M1&&< 10.1.5510.1.55org.apache.tomcat:tomcat:10.1.55
☕Mavenorg.apache.tomcat:tomcat≥ 11.0.0-M1&&< 11.0.2211.0.22org.apache.tomcat:tomcat:11.0.22

Affected Products

1 product · 5 configurations
Application
tomcatapache
≥ 11.0.0 && ≤ 8.5.100
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat.embed:tomcat-embed-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.tomcat.embed:tomcat-embed-core to 9.0.118 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-43514 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow
ProductFixed inAdvisory
Red Hat Enterprise Linux 10tomcat9-1:9.0.120-1.el10_2RHSA-2026:68651
Red Hat Enterprise Linux 10.0 Extended Update Supporttomcat9-1:9.0.120-1.el10_0RHSA-2026:67163
Red Hat Enterprise Linux 8tomcat-1:9.0.120-1.el8_10RHSA-2026:68677
Red Hat Enterprise Linux 8.8 Telecommunications Update Servicetomcat-1:9.0.120-1.el8_8RHSA-2026:68680
Red Hat Enterprise Linux 9tomcat-1:9.0.120-2.el9_8RHSA-2026:68660
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutionstomcat-1:9.0.120-1.el9_2RHSA-2026:68678
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutionstomcat-1:9.0.120-1.el9_4RHSA-2026:68679
Red Hat Enterprise Linux 9.6 Extended Update Supporttomcat-1:9.0.120-1.el9_6RHSA-2026:68659

Frequently Asked Questions

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected Description: The AJP secret was compared in non-constant time allowing an attacker on the local network to mount a timing attack to determine the AJP secret. Mitigation: Users of the affected versions should apply one of the following mitigations: - Upgrade to Apache Tomcat 11.0.22 or later - Upgrade to Apache Tomcat 10.1.55 or later - Upgrade to Apache Tomcat 9.0.118 or later
O3 Security · Impact-Aware SCA

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CVE-2026-43514: tomcat-embed-core — Fixed in 9.0.118