GHSA-w33c-445m-f8w7 is a medium-severity (CVSS 5.9) CWE-195 vulnerability in com.squareup.okio:okio. 1 public exploit reference exists, so weaponization risk is real. A fix is available for com.squareup.okio:okio — see the affected versions and patch details below.
Okio Signed to Unsigned Conversion Error 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-w33c-445m-f8w7.
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-w33c-445m-f8w7 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 379,145 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
com.squareup.okio:okio☕com.squareup.okio:okio☕com.squareup.okio:okio-jvmReal-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
GzipSource does not handle an exception that might be raised when parsing a malformed gzip buffer. This may lead to denial of service of the Okio client when handling a crafted GZIP archive, by using the GzipSource class.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | com.squareup.okio:okio | ≥ 2.0.0-RC1&&< 3.4.0 | 3.4.0com.squareup.okio:okio:3.4.0 |
| ☕Maven | com.squareup.okio:okio | all versions | 1.17.6com.squareup.okio:okio:1.17.6 |
| ☕Maven | com.squareup.okio:okio-jvm | ≥ 2.0.0-RC1&&< 3.4.0 | 3.4.0com.squareup.okio:okio-jvm:3.4.0 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.squareup.okio:okio, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.squareup.okio:okio to 3.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-w33c-445m-f8w7 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-w33c-445m-f8w7 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-w33c-445m-f8w7. 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.
Red Hat JBoss Enterprise Application Platform XP does contain Okio package but is not using GzipSource.java, which is the affected class. Red Hat support for Spring Boot is considered low impact as it's used by Dekorate during compilation process and not included in the resulting Jar.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat AMQ Streams 2.5.0 | see advisory | RHSA-2023:5165 |
| Red Hat Fuse 7.12.1 | okio | RHSA-2023:7247 |
| Red Hat JBoss Enterprise Application Platform Expansion Pack | okio | RHSA-2024:3385 |
| Red Hat OpenShift Dev Spaces 3 Containers | devspaces/code-rhel8:3.16-20 | RHSA-2024:6667 |
| RHPAM 7.13.5 async | okio | RHSA-2024:1353 |
Frequently Asked Questions
Is GHSA-w33c-445m-f8w7 in your dependencies?
O3 Security finds GHSA-w33c-445m-f8w7 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.