GHSA-27hp-xhwr-wr2m
GHSA-27hp-xhwr-wr2m is a CWE-367 vulnerability in org.apache.tomcat:tomcat-catalina. O3 Security confirms whether GHSA-27hp-xhwr-wr2m is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Apache Tomcat Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability
Blast Radius
org.apache.tomcat:tomcat-catalina☕org.apache.tomcat:tomcat-catalina☕org.apache.tomcat:tomcat-embed-core☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat.embed:tomcat-embed-coreReal-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
Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.1, from 10.1.0-M1 through 10.1.33, from 9.0.0.M1 through 9.0.97.
The mitigation for CVE-2024-50379 was incomplete.
Users running Tomcat on a case insensitive file system with the default servlet write enabled (readonly initialisation parameter set to the non-default value of false) may need additional configuration to fully mitigate CVE-2024-50379 depending on which version of Java they are using with Tomcat:
- running on Java 8 or Java 11: the system property sun.io.useCanonCaches must be explicitly set to false (it defaults to true)
- running on Java 17: the system property sun.io.useCanonCaches, if set, must be set to false (it defaults to false)
- running on Java 21 onwards: no further configuration is required (the system property and the problematic cache have been removed)
Tomcat 11.0.3, 10.1.35 and 9.0.99 onwards will include checks that sun.io.useCanonCaches is set appropriately before allowing the default servlet to be write enabled on a case insensitive file system. Tomcat will also set sun.io.useCanonCaches to false by default where it can.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.apache.tomcat:tomcat-catalina | ≥ 11.0.0-M1&&< 11.0.2 | 11.0.2 |
| ☕Maven | org.apache.tomcat:tomcat-catalina | ≥ 10.1.0-M1&&< 10.1.34 | 10.1.34 |
| ☕Maven | org.apache.tomcat:tomcat-embed-core | ≥ 9.0.0.M1&&< 9.0.98 | 9.0.98 |
| ☕Maven | org.apache.tomcat.embed:tomcat-embed-core | ≥ 11.0.0-M1&&< 11.0.2 | 11.0.2 |
| ☕Maven | org.apache.tomcat.embed:tomcat-embed-core | ≥ 10.1.0-M1&&< 10.1.34 | 10.1.34 |
| ☕Maven | org.apache.tomcat.embed:tomcat-embed-core | ≥ 9.0.0.M1&&< 9.0.98 | 9.0.98 |
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. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update org.apache.tomcat:tomcat-catalina to 11.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-27hp-xhwr-wr2m 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 pinpoints whether GHSA-27hp-xhwr-wr2m is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-27hp-xhwr-wr2m. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-27hp-xhwr-wr2m in your dependencies?
O3 detects GHSA-27hp-xhwr-wr2m across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.