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CVE-2026-18024VulnerabilityPublished

PostgreSQL ascii() SQL function · Buffer Over-read

Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-18024· Medium 4.3

Not known to be exploited · CVSS 4.3 Medium · fixed in 18.6 : update PostgreSQL when convenient.

Data as of 12 Nov 2026, 23:24 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 18.6, 17.11, 16.15 +3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
PostgreSQLAffected
  • >=18 <18.6
Fixed in
  • 18.6
PostgreSQLAffected
  • >=17 <17.11
Fixed in
  • 17.11
PostgreSQLAffected
  • >=16 <16.15
Fixed in
  • 16.15
PostgreSQLAffected
  • >=15 <15.19
Fixed in
  • 15.19
PostgreSQLAffected
  • <14.24
Fixed in
  • 14.24
Postgresqlpostgresql/postgresqlpkg:deb/postgresql/postgresqlOther threatsAffected
  • <14.24
  • <15.19
  • <16.15
  • <17.11
  • <18.5
Fixed in
  • 14.24
  • 15.19
  • 16.15
  • 17.11
  • 18.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available in PostgreSQL versions 18.5, 17.11, 16.15, 15.19, and 14.24. Users should upgrade to these or later versions to remediate the vulnerability. No additional mitigation steps are indicated.

Description

A buffer over-read vulnerability exists in the PostgreSQL ascii() SQL function that allows a user with limited privileges to read up to 3 bytes beyond the allocated memory of a crafted text value. This flaw affects PostgreSQL versions prior to 18.5, 17.11, 16.15, 15.19, and 14.24 and is similar to a previously fixed issue (CVE-2026-2006) but with less impact.

References

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