Deserialization of Untrusted Data The advisory has been revoked - it doesn't affect any version of package openshift-service-mesh/istio-operator-bundle (opens in a new tab)
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-RHEL8-OPENSHIFTSERVICEMESHISTIOOPERATORBUNDLE-15058746
- published22 Jan 2026
- disclosed20 Jan 2026
Introduced: 20 Jan 2026
CVE-2025-56005 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:8.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openshift-service-mesh/istio-operator-bundle package and not the openshift-service-mesh/istio-operator-bundle package as distributed by RHEL.
An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the picklefile parameter in the yacc() function. This parameter accepts a .pkl file that is deserialized with pickle.load() without validation. Because pickle allows execution of embedded code via __reduce__(), an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentation or the GitHub repository, yet it is active in the PyPI version. This introduces a stealthy backdoor and persistence risk. NOTE: A third-party states that this vulnerability should be rejected because the proof of concept does not demonstrate arbitrary code execution and fails to complete successfully.
References
- https://access.redhat.com/security/cve/CVE-2025-56005
- https://github.com/bohmiiidd/Undocumented-RCE-in-PLY
- https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005
- http://www.openwall.com/lists/oss-security/2026/01/23/4
- http://www.openwall.com/lists/oss-security/2026/01/23/5
- http://www.openwall.com/lists/oss-security/2026/01/28/5
- http://www.openwall.com/lists/oss-security/2026/01/29/1
- http://www.openwall.com/lists/oss-security/2026/01/29/2
- https://github.com/tom025/ply_exploit_rejection
- http://www.openwall.com/lists/oss-security/2026/01/30/1
- https://github.com/tom025/ply_exploit_rejection/issues/1
- https://bugzilla.redhat.com/show_bug.cgi?id=2431308
- https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-56005.json