CVE-2022-38749
MEDIUMCVE-2022-38749 is a medium-severity (CVSS 6.5) CWE-121 vulnerability in org.yaml:snakeyaml. O3 Security confirms whether CVE-2022-38749 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
DoS in SnakeYAML
Blast Radius
org.yaml:snakeyaml☕be.cylab:snakeyaml☕com.alipay.sofa.acts:acts-common-util☕io.prometheus.jmx:jmx_prometheus_httpserver☕io.prometheus.jmx:jmx_prometheus_httpserver_java6☕org.testifyproject.external:external-snakeyaml☕pl.droidsonroids.yaml:snakeyamlReal-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
Using snakeYAML to parse untrusted YAML files may be vulnerable to Denial of Service attacks (DOS). If the parser is running on user supplied input, an attacker may supply content that causes the parser to crash by stackoverflow.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.yaml:snakeyaml | all versions | 1.31 |
| ☕Maven | be.cylab:snakeyaml | all versions | No fix |
| ☕Maven | com.alipay.sofa.acts:acts-common-util | all versions | No fix |
| ☕Maven | io.prometheus.jmx:jmx_prometheus_httpserver | all versions | No fix |
| ☕Maven | io.prometheus.jmx:jmx_prometheus_httpserver_java6 | all versions | No fix |
| ☕Maven | org.testifyproject.external:external-snakeyaml | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.yaml:snakeyaml. 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.yaml:snakeyaml to 1.31 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-38749 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 CVE-2022-38749 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 CVE-2022-38749. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2022-38749 in your dependencies?
O3 detects CVE-2022-38749 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.