Use After Free Affecting ruby3.3-fluentd-kubernetes-daemonset-1.18 package, versions <1.18.0.1.5-r4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-WOLFILATEST-RUBY33FLUENTDKUBERNETESDAEMONSET118-17671943
- published29 Jun 2026
- disclosed1 Jul 2026
Introduced: 29 Jun 2026
NewCVE-2026-54902 (opens in a new tab)How to fix?
Upgrade Wolfi ruby3.3-fluentd-kubernetes-daemonset-1.18 to version 1.18.0.1.5-r4 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby3.3-fluentd-kubernetes-daemonset-1.18 package and not the ruby3.3-fluentd-kubernetes-daemonset-1.18 package as distributed by Wolfi.
See How to fix? for Wolfi relevant fixed versions and status.
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to version 3.17.2, is vulnerable to Use-After-Free when in SAJ mode. The Oj::Parser does not protect cached object keys (≥ 35 bytes) from garbage collection, and a Ruby callback that triggers GC inside hash_end can cause the key string to be reclaimed while the C parser still holds a pointer to it. The subsequent access to the freed string VALUE results in a segfault, confirmed by an RIP pointing to address 0x4242 (a canary-style pattern suggesting control over the freed memory's content). This issue has been fixed in version 3.17.2.