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Integer OverflowWeakness · CWE-190

CVE-2026-15742

HIGH · 8.8 CVSS v3.1 Published 2026-08-13
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable Zero-click 6 days old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Integer wraparound in PostgreSQL fuzzystrmatch allows a user to direct writes to a huge range of addresses, executing arbitrary code as the operating system user running the database, via extreme inputs to SQL function levenshtein() or levenshtein_less_equal(). Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-190

An arithmetic operation produces a value too large for its type and wraps around to an unexpected — often tiny or negative — number. That miscalculated value then drives a memory allocation or a bounds check, opening the door to corruption. The fix is checked arithmetic and validating sizes before they're used.

General guidance for the integer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Recommended fix High confidence

PostgreSQL 18.5, 17.11, 16.15, 15.19, or 14.24 (upgrade to the latest patch in your current major version line)

  1. 1. Identify your current PostgreSQL version using: psql -V or SELECT version();
  2. 2. Determine your current major version (e.g., 14, 15, 16, 17, 18) to select the appropriate upgrade path
  3. 3. Back up your entire database cluster before upgrading, using pg_dumpall or your preferred backup method
  4. 4. Stop the PostgreSQL service: sudo systemctl stop postgresql (or equivalent for your system)
  5. 5. Install the fixed version: For PostgreSQL 18.x upgrade to 18.5+, for 17.x upgrade to 17.11+, for 16.x upgrade to 16.15+, for 15.x upgrade to 15.19+, or for 14.x upgrade to 14.24+
  6. 6. If using a package manager (apt, yum, dnf), run: sudo apt-get install postgresql (or appropriate package) to get the latest patch in your major version
  7. 7. Start the PostgreSQL service: sudo systemctl start postgresql
  8. 8. Verify the fuzzystrmatch extension is updated by running: SELECT levenshtein('test','test'); to confirm the function works without integer overflow
Caveat Major version upgrades may require migration steps; always review PostgreSQL release notes for breaking changes between minor versions

Generated from the published advisory — verify against the referenced sources before acting.

No vendor fix exists The vendor has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-15742 in production — separate from our analysis above.

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