CVE-2026-116323 PUBLISHED

PostgreSQL pltcl reentrant result conversion use-after-free executes arbitrary code

Assigner: PostgreSQL
Reserved: 26.10.2026 Published: 12.11.2026 Updated: 12.11.2026

Use after free in PostgreSQL pltcl allows an object creator to execute arbitrary code as the operating system user running the database, via a domain CHECK that re-enters the Tcl interpreter and frees or changes a string still used by the outer result conversion. Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.8

Product Status

Vendor n/a
Product PostgreSQL
Versions Default: unaffected
  • affected from 18 to 18.7 (excl.)
  • affected from 17 to 17.12 (excl.)
  • affected from 16 to 16.16 (excl.)
  • affected from 15 to 15.20 (excl.)
  • affected from 0 to 14.25 (excl.)

Affected Configurations

Attacker has permission to "CREATE EXTENSION pltcl", or another user previously issued that. Attacker has permission to create objects (temporary objects or non-temporary objects in at least one schema).

Credits

  • The PostgreSQL project thanks Anthropic OSS program for reporting this problem.

References

Problem Types

  • Use After Free CWE