---
id: CVE-2026-103111
title: >-
  PCRE2 before 10.49, when there is an attacker-controlled regular expression
  and certain JIT API usage, allows an out-of-bounds write with arbitrary data.
summary: >-
  PCRE2 before 10.49, when there is an attacker-controlled regular expression
  and certain JIT API usage, allows an out-of-bounds write with arbitrary data.
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L'
cwe:
  - CWE-787
vendor: PCRE
product: PCRE2
affected:
  - PCRE2 < 10.49
patched:
  - hardened_images
published: '2026-09-30'
updated: '2026-10-04'
sourceUpdated: '2026-10-04T00:16:35.563'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103111'
references:
  - url: >-
      https://github.com/PCRE2Project/pcre2/security/advisories/GHSA-r9hj-j2rw-4q3m
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2026/10/msg00008.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/PCRE2Project/pcre2/security/advisories/GHSA-r9hj-j2rw-4q3m
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103111.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-103111'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2543797'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-103111'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103111'
  - url: 'https://access.redhat.com/errata/RHSA-2026:74972'
  - url: 'https://access.redhat.com/errata/RHSA-2026:81522'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82845'
  - url: 'https://access.redhat.com/errata/RHSA-2026:81532'
  - url: 'https://access.redhat.com/errata/RHSA-2026:81613'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T18:44:17.818308Z'
epss: 0.00269
epssPercentile: 0.18915
ingestedAt: '2026-09-30T04:57:05.265Z'
---

## Overview

PCRE2 before 10.49, when there is an attacker-controlled regular expression and certain JIT API usage, allows an out-of-bounds write with arbitrary data.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103111.json)
- **RHSA-2026:74972** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74972)
- **RHSA-2026:81522** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:81522)
- **RHSA-2026:82845** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:82845)
- **RHSA-2026:81532** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:81532)
- **RHSA-2026:81613** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:81613)