CVE-2026-15742
Description
A flaw was found in PostgreSQL fuzzystrmatch. A low-privileged database user can exploit an integer wraparound vulnerability by providing extreme inputs to the levenshtein() or levenshtein_less_equal() SQL functions. This allows the user to execute arbitrary code as the operating system user running the database, potentially leading to full system compromise.
Statement
This vulnerability in the PostgreSQL fuzzystrmatch extension is rated as Important. A low-privileged database user could achieve arbitrary code execution as the operating system user running the database. This risk is present only when the fuzzystrmatch extension is explicitly installed and utilized, as it is not enabled by default in Red Hat deployments. The flaw stems from an integer wraparound when processing extreme inputs to specific SQL functions.
Mitigation
To mitigate this issue, consider disabling the `fuzzystrmatch` extension within PostgreSQL if its functionality is not essential. Alternatively, the `postgresql-fuzzystrmatch` package can be removed. Disabling or removing the extension may affect applications that rely on the `levenshtein()` or `levenshtein_less_equal()` functions. A database service restart may be required for these changes to take effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 8.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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