Use After Free Affecting ruby3.4-fluentd-kubernetes-daemonset-1.16 package, versions <1.16.11.1.0-r2
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-CHAINGUARDLATEST-RUBY34FLUENTDKUBERNETESDAEMONSET116-17686462
- published30 Jun 2026
- disclosed1 Jul 2026
Introduced: 30 Jun 2026
CVE-2026-54899 (opens in a new tab)How to fix?
Upgrade Chainguard ruby3.4-fluentd-kubernetes-daemonset-1.16 to version 1.16.11.1.0-r2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby3.4-fluentd-kubernetes-daemonset-1.16 package and not the ruby3.4-fluentd-kubernetes-daemonset-1.16 package as distributed by Chainguard.
See How to fix? for Chainguard 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, disabling symbol_keys on a reused Oj::Parser instance triggers a heap use-after-free. When symbol_keys is toggled from true to false, opt_symbol_keys_set frees the internal key cache (cache_free) but does not clear the pointer. The next parse call reads from the freed cache via cache_intern, producing a use-after-free. This issue has been fixed in version 3.17.2.