Vulnerability in FasterXML jackson-databind

[ Description ]Official description

jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.10.0 until 2.18.8, 2.21.4, and 3.1.4, BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() allowlists any array type based only on clazz.isArray(), without validating the array's component (element) type against the configured allowlist. A PTV built with allowIfSubTypeIsArray() plus an explicit concrete-type allowlist therefore still permits EvilType[] even though EvilType is not allowlisted. When Jackson deserializes the elements and no per-element type IDs are present, it instantiates the component type directly with no further PTV check, bypassing the allowlist. This vulnerability is fixed in 2.18.8, 2.21.4, and 3.1.4.

[ 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-2026-4084

  Oracle Siebel CRM: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-11332CVE-2026-91427CVE-2026-101444+118 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
• BSI CERT-Bund20 Oct 2026WID-SEC-2026-4056

  Atlassian products (Bamboo, Bitbucket, Confluence, Crucible, Fisheye and Jira): Multiple vulnerabilities Translated from German

  CVE-2026-13676CVE-2026-50750CVE-2026-53404+72 more CVEs
• CERT-FR16 Oct 2026CERTFR-2026-AVI-1336

  Multiple vulnerabilities in IBM products Translated from French

  Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-14671CVE-2026-11548CVE-2022-22950+490 more CVEs
• CERT-FR9 Oct 2026CERTFR-2026-AVI-1291

  Multiple vulnerabilities in IBM products Translated from French

  Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-49978CVE-2025-27895CVE-2026-59651+195 more CVEs
• CERT-FR2 Oct 2026CERTFR-2026-AVI-1256

  Multiple vulnerabilities in IBM products Translated from French

  Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-27980CVE-2026-58055CVE-2026-49978+360 more CVEs
• BSI CERT-Bund27 Sep 2026WID-SEC-2026-3595

  IBM QRadar SIEM: Multiple vulnerabilities Translated from German

  CVE-2025-54518CVE-2026-44186CVE-2026-59878+151 more CVEs

[ References ]References

• github.com/FasterXML/jackson-databind/security/advisories/GHSA-rmj7-2vxq-3g9fx_refsource_CONFIRM
• github.com/FasterXML/jackson-databind/issues/5981x_refsource_MISC
• github.com/FasterXML/jackson-databind/issues/5983x_refsource_MISC
• github.com/FasterXML/jackson-databind/pull/5984x_refsource_MISC
• github.com/FasterXML/jackson-databind/commit/01d1692c8d0ed03e51a0e3c4f8a9e6908e4931e5x_refsource_MISC
• github.com/FasterXML/jackson-databind/commit/24529da29fdf46ff94ca38de9ebf31cd188f5e8ex_refsource_MISC