Limited memory disclosure via picksplit buffer over-read
Published Aug 13, 2026 · Updated Aug 13, 2026
Buffer over-read in PostgreSQL pg_trgm allows remote authenticated users to infer limited server-memory values through index split choices. A data-type error in the GiST picksplit function makes it read beyond its heap buffer while choosing how to divide index entries. A table maintainer who can influence pg_trgm GiST index splits receives only a lossy, limited memory signal, while a rare over-read can crash the server.
Summary
What happened
Buffer over-read in PostgreSQL pg_trgm allows remote authenticated users to infer limited server-memory values through index split choices. A data-type error in the GiST picksplit function makes it read beyond its heap buffer while choosing how to divide index entries. A table maintainer who can influence pg_trgm GiST index splits receives only a lossy, limited memory signal, while a rare over-read can crash the server.
The record
- CVE
- CVE-2026-14678
- Published
- Aug 13, 2026
- Updated
- Aug 13, 2026
- Vendor
- PostgreSQL Global Development Group
- Product
- PostgreSQL
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 13, 2026CVE publishedPublication date reported by the CVE source.
- Aug 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <14.24
- Affected versionversion=15 <15.19
- Affected versionversion=16 <16.15
- Affected versionversion=17 <17.11
- Affected versionversion=18 <18.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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