GHSA-9m3c-qcxr-9x87 — tomcat-catalina
MEDIUMGHSA-9m3c-qcxr-9x87 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in org.apache.tomcat:tomcat-catalina. A fix is available for org.apache.tomcat:tomcat-catalina — see the affected versions and patch details below.
Apache Tomcat has an Open Redirect vulnerability
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 GHSA-9m3c-qcxr-9x87.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-9m3c-qcxr-9x87 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
org.apache.tomcat:tomcat-catalina☕org.apache.tomcat:tomcat-catalina☕org.apache.tomcat:tomcat-catalina☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat.embed:tomcat-embed-core+1 moreReal-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
Occasional URL redirection to untrusted Site ('Open Redirect') vulnerability in Apache Tomcat via the LoadBalancerDrainingValve.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M23 through 9.0.115, from 8.5.30 through 8.5.100. Other, unsupported versions may also be affected
Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.apache.tomcat:tomcat-catalina | ≥ 8.5.30&&< 9.0.116 | 9.0.116org.apache.tomcat:tomcat-catalina:9.0.116 |
| ☕Maven | org.apache.tomcat:tomcat-catalina | ≥ 10.1.0-M1&&< 10.1.53 | 10.1.53org.apache.tomcat:tomcat-catalina:10.1.53 |
| ☕Maven | org.apache.tomcat:tomcat-catalina | ≥ 11.0.0-M1&&< 11.0.20 | 11.0.20org.apache.tomcat:tomcat-catalina:11.0.20 |
| ☕Maven | org.apache.tomcat:tomcat | ≥ 8.5.30&&< 9.0.116 | 9.0.116org.apache.tomcat:tomcat:9.0.116 |
| ☕Maven | org.apache.tomcat:tomcat | ≥ 10.1.0-M1&&< 10.1.53 | 10.1.53org.apache.tomcat:tomcat:10.1.53 |
| ☕Maven | org.apache.tomcat:tomcat | ≥ 11.0.0-M1&&< 11.0.20 | 11.0.20org.apache.tomcat:tomcat:11.0.20 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat-catalina, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.tomcat:tomcat-catalina to 9.0.116 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9m3c-qcxr-9x87 is resolved across your whole dependency graph.
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.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-9m3c-qcxr-9x87 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-9m3c-qcxr-9x87. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
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.
This Low impact vulnerability in Apache Tomcat allows for an open redirect through the LoadBalancerDrainingValve. An attacker could exploit this to redirect users to malicious websites, potentially leading to phishing. This affects Red Hat Enterprise Linux and Red Hat JBoss Web Server when Apache Tomcat is configured…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Enterprise Linux 10 | tomcat9-1:9.0.117-2.el10_2 | RHSA-2026:36790 |
| Red Hat JBoss Web Server 6.2.3 | tomcat | RHSA-2026:20406 |
| Red Hat JBoss Web Server 6.2 on RHEL 10 | jws6-tomcat-0:10.1.49-13.redhat_00011.1.el10jws | RHSA-2026:20405 |
Frequently Asked Questions
Is GHSA-9m3c-qcxr-9x87 in your dependencies?
O3 Security finds GHSA-9m3c-qcxr-9x87 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.