Vulnerability in SnakeYAML

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)
• EPSS: 100% chance of exploitation in the next 30 days (higher than 100% of CVEs)

[ Description ]Official description

SnakeYaml's Constructor() class does not restrict types which can be instantiated during deserialization. Deserializing yaml content provided by an attacker can lead to remote code execution. We recommend using SnakeYaml's SafeConsturctor when parsing untrusted content to restrict deserialization. We recommend upgrading to version 2.0 and beyond.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• NCSC-NL22 Oct 2026NCSC-2026-0448

  Vulnerabilities fixed in Oracle Fusion Middleware Translated from Dutch

  Probability/damage H/HCVE-2026-54513CVE-2026-56741CVE-2026-59649+191 more CVEs
• BSI CERT-Bund20 Oct 2026WID-SEC-2026-4078

  Oracle Fusion Middleware: Multiple vulnerabilities Translated from German

  CVE-2026-91212CVE-2023-43622CVE-2026-42779+191 more CVEs

[ References ]References

• github.com/google/security-research/security/advisories/GHSA-mjmj-j48q-9wg2
• bitbucket.org/snakeyaml/snakeyaml/issues/561/cve-2022-1471-vulnerability-in
• github.com/mbechler/marshalsec
• www.github.com/mbechler/marshalsec/blob/master/marshalsec.pdf
• groups.google.com/g/kubernetes-security-announce/c/mwrakFaEdnc
• security.netapp.com/advisory/ntap-20230818-0015
• packetstormsecurity.com/files/175095/PyTorch-Model-Server-Registration-Deserialization-…
• www.openwall.com/lists/oss-security/2023/11/19/1
• security.netapp.com/advisory/ntap-20240621-0006
• infosecwriteups.com/%EF%B8%8F-inside-the-160-comment-fight-to-fix-snakeyamls-rce-defaul…
• confluence.atlassian.com/security/cve-2022-1471-snakeyaml-library-rce-vulnerability-in-…