CVE-2026-14678: PostgreSQL pg_trgm picksplit reads past end of buffer

mediumCVSS 4.3CVE-2026-14678

CSIRTS triage

vendor: PostgreSQL product: PostgreSQL Memory corruption Information disclosure

What: The pg_trgm picksplit function reads past the end of a buffer during trigram index operations.
Who is affected: PostgreSQL deployments with pg_trgm extension enabled.
Urgency: Medium severity (CVSS 4.3); limited immediate impact but potential for information disclosure.
Action: Update PostgreSQL and review pg_trgm usage.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 4.3
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-14678

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-2026-146780.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-14678	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
mediumCVE-2026-14678: Buffer over-read in PostgreSQL pg_trgm index picksplit function reads past end of a heap buffe…nvd

Recent advisories for PostgreSQL pg_trgm picksplit

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-14678: Buffer over-read in PostgreSQL pg_trgm index picksplit function reads past end of a heap buffe…nvd · 2026-08-13