CVE-2026-15742: PostgreSQL fuzzystrmatch writes effectively-arbitrary addresses, via integer wraparound

Published Aug 13, 2026
·
Updated

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 levenshteinlessequal(). Versions before PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.

Other sources

PostgreSQL fuzzystrmatch writes effectively-arbitrary addresses, via integer wraparound

— Microsoft

Affected Software

25 affected componentsFixes available
PostgreSQL fuzzystrmatch<14.24
PostgreSQL fuzzystrmatch<15.19
PostgreSQL fuzzystrmatch<16.15
PostgreSQL fuzzystrmatch<17.11
PostgreSQL fuzzystrmatch<18.5
Microsoft azl3 postgresql 16.14-1<16.15-1
16.15-1
PostgreSQL postgresql>=14.0<14.24
PostgreSQL postgresql>=15.0<15.19
PostgreSQL postgresql>=16.0<16.15
PostgreSQL postgresql>=17.0<17.11
PostgreSQL postgresql>=18.0<18.5
IBM QRadar<=7.6.0.0 - 7.6.0.4
IBM QRadar<=7.5.0 - 7.5.0 UP16 IF01
alpine/postgresql15<15.19-r0
15.19-r0
alpine/postgresql15<15.19-r0
15.19-r0
alpine/postgresql16<16.15-r0
16.15-r0
alpine/postgresql16<16.15-r0
16.15-r0
alpine/postgresql16<16.15-r0
16.15-r0
alpine/postgresql16<16.15-r0
16.15-r0
alpine/postgresql17<17.11-r0
17.11-r0
alpine/postgresql17<17.11-r0
17.11-r0
alpine/postgresql17<17.11-r0
17.11-r0
alpine/postgresql17<17.11-r0
17.11-r0
alpine/postgresql18<18.5-r0
18.5-r0
alpine/postgresql18<18.5-r0
18.5-r0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 16.15-1
  2. Upgrade

    Upgrade alpine/postgresql15 to a version that resolves this vulnerability.

    Fixed in 15.19-r0
  3. Upgrade

    Upgrade alpine/postgresql16 to a version that resolves this vulnerability.

    Fixed in 16.15-r0
  4. Upgrade

    Upgrade alpine/postgresql17 to a version that resolves this vulnerability.

    Fixed in 17.11-r0
  5. Upgrade

    Upgrade alpine/postgresql18 to a version that resolves this vulnerability.

    Fixed in 18.5-r0
  6. Upgrade

    Upgrade PostgreSQL to a version that resolves this vulnerability.

    Fixed in 18.6
  7. Upgrade

    Upgrade PostgreSQL to a version that resolves this vulnerability.

    Fixed in 17.11
  8. Upgrade

    Upgrade PostgreSQL to a version that resolves this vulnerability.

    Fixed in 16.15
  9. Upgrade

    Upgrade PostgreSQL to a version that resolves this vulnerability.

    Fixed in 15.19
  10. Upgrade

    Upgrade PostgreSQL to a version that resolves this vulnerability.

    Fixed in 14.24

Event History

Aug 13, 2026
CVE Published
via MITRE·01:00 PM
Data Sourced
via MITRE·01:00 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·01:17 PM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via OSV·01:17 PM
DescriptionSeverityAffected Software
Data Sourced
via Red Hat·01:29 PM
DescriptionSeverityAffected Software
Aug 15, 2026
Data Sourced
via Microsoft·02:35 AM
DescriptionSeverityWeaknessAffected Software
Oct 13, 2026
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2026-15742?

CVE-2026-15742 has a severity rating of high with a score of 8.8.

2

How do I fix CVE-2026-15742?

To mitigate CVE-2026-15742, upgrade to PostgreSQL version 18.5, 17.11, or later.

3

What software is affected by CVE-2026-15742?

CVE-2026-15742 affects the PostgreSQL fuzzystrmatch extension.

4

What kind of impact does CVE-2026-15742 have?

CVE-2026-15742 allows arbitrary code execution due to integer wraparound in vulnerable SQL functions.

5

Which specific functions are involved in CVE-2026-15742?

The functions involved in CVE-2026-15742 are levenshtein() and levenshtein_less_equal().

Company

Resources

Contact

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