CVE-2026-16239: PostgreSQL type confusion in cursor CLOSE + DECLARE executes arbitrary code
CSIRTS triage
- What
- Type confusion in cursor CLOSE and DECLARE statements allows arbitrary code execution.
- Who is affected
- PostgreSQL deployments accepting untrusted cursor operations.
- Urgency
- High severity (CVSS 8.8); patch immediately to prevent code execution.
- Action
- Update PostgreSQL to a patched version addressing CVE-2026-16239.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-16239
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-162390.60% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 46% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-16239 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[NEW] [high] PostgreSQL: Multiple vulnerabilitiescert-bund
- unknownUSN-8653-1: PostgreSQL vulnerabilitiesubuntu
- unknownMultiple vulnerabilities in PostgreSQL (August 14, 2026)cert-fr-avis
- highCVE-2026-16239: Type confusion in PostgreSQL "portal"/cursor lifecycle allows a user to execute arbitrary code…nvd
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