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low 2.9

CVE-2026-89156 json

PCRE2: out-of-bounds read in pcre2_match() after JIT fallback with invalid UTF

published 2mo ago modified last mo. also EUVD-2026-75942 , GHSA-2p8c-ff85-vh9x

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository PCRE2Project/pcre2. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
2.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

PCRE2 before 10.48 has a pcre2_match out-of-bounds read after a JIT fallback when an attacker can provide invalid UTF data.

Patch / fix

  • PCRE PCRE2 10.48
  • pcre2 Debian 12 10.42-1+deb12u1
  • pcre2 Debian 13 10.46-1~deb13u2
  • pcre2 Debian 14 10.48-1

debian advisories DEBIAN-CVE-2026-89156

  • pcre2 Ubuntu 22.04 LTS 10.39-3ubuntu0.2
  • pcre2 Ubuntu 24.04 LTS 10.42-4ubuntu2.2
  • pcre2 Ubuntu 26.10 10.46-1ubuntu1
  • pcre2 Ubuntu 26.04 LTS 10.46-1ubuntu0.1
  • pcre2 Ubuntu Pro 20.04 LTS 10.34-7ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2026-89156

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • pcre2 RHEL 9 10.40-7.el9_8
  • pcre2-tools RHEL 9 10.40-7.el9_8
  • pcre2-utf16 RHEL 9 10.40-7.el9_8
  • pcre2-utf32 RHEL 9 10.40-7.el9_8
  • pcre2-syntax RHEL 9 10.40-7.el9_8
  • pcre2 RHEL 10.2 10.44-1.5.el10_2
  • pcre2-tools RHEL 10.2 10.44-1.5.el10_2
  • pcre2-utf16 RHEL 10.2 10.44-1.5.el10_2

red hat advisories RHSA-2026:81532RHSA-2026:81522RHSA-2026:67534

  • pcre2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 10.39-150400.4.12.1
  • pcre2 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 10.45-160000.4.1
  • pcre2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 10.42-150600.3.3.1
  • pcre2 Linux Micro 6.1 10.42-slfo.1.1_2.1
  • pcre2 Linux Micro 6.0 10.42-3.1
  • pcre2 SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 10.34-1.16.1

suse advisories SUSE-SU-2026:4458-1SUSE-SU-2026:23891-1SUSE-SU-2026:23906-1SUSE-SU-2026:4241-1SUSE-SU-2026:4201-1SUSE-SU-2026:23740-1

  • pcre2 openSUSE Leap 16.0 10.45-160000.4.1

opensuse advisories openSUSE-SU-2026:21938-1

  • pcre2 AlmaLinux 10 10.44-1.5.el10_2
  • pcre2-tools AlmaLinux 10 10.44-1.5.el10_2
  • pcre2-utf16 AlmaLinux 10 10.44-1.5.el10_2
  • pcre2-utf32 AlmaLinux 10 10.44-1.5.el10_2
  • pcre2-syntax AlmaLinux 10 10.44-1.5.el10_2
  • pcre2 AlmaLinux 9 10.40-7.el9_8
  • pcre2-tools AlmaLinux 9 10.40-7.el9_8
  • pcre2-utf16 AlmaLinux 9 10.40-7.el9_8

almalinux advisories ALSA-2026:81522ALSA-2026:81532

  • pcre2 Rocky Linux 10 10.44-1.5.el10_2
  • pcre2 Rocky Linux 9 10.40-7.el9_8

rocky linux advisories RLSA-2026:81522RLSA-2026:81532

  • pcre2 Alpine 3.21 10.43-r1
  • pcre2 Alpine 3.22 10.46-r1
  • pcre2 Alpine 3.24, Alpine 3.23 10.48-r0

alpine advisories ALPINE-CVE-2026-89156

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • pcre2 Azure Linux 3.0 10.48-1

azure linux advisories AZL-100065

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-89156 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-89156 updated cvss 2.9

PCRE2: PCRE2: Out-of-bounds read via invalid UTF data during JIT fallback

  • Red Hat Enterprise Linux 7 pcre2, pcre2-tools, pcre2-utf16, pcre2-utf32 Red Hat Enterprise Linux 8 Judy, galera, mariadb, mariadb-pam, mariadb-test, mariadb-backup, +8 more Red Hat Enterprise Linux 9 bootc, mariadb, mariadb-pam, mariadb-test, mingw32-pcre2, mingw64-pcre2, +10 more Red Hat Enterprise Linux 10 bootc, mariadb11.8, mingw-pcre2, mariadb10.11, mingw32-pcre2, mingw64-pcre2 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9
    under investigation
  • Red Hat Cost Management On-Premise 1 costmanagement/costmanagement-ui-rhel10 1792605272
    fixed: vendor fix RHSA-2026:87400
  • Red Hat Enterprise Linux AppStream (v. 9) pcre2-utf16 10.40-7.el9_8, pcre2-utf32 10.40-7.el9_8
    fixed: vendor fix RHSA-2026:81532
  • Red Hat Enterprise Linux AppStream (v. 10) pcre2-utf16 10.44-1.5.el10_2, pcre2-utf32 10.44-1.5.el10_2
    fixed: vendor fix RHSA-2026:81522
  • Red Hat Enterprise Linux BaseOS (v. 9) pcre2 10.40-7.el9_8, pcre2-syntax 10.40-7.el9_8
    fixed: vendor fix RHSA-2026:81532
  • Red Hat Enterprise Linux BaseOS (v. 10) pcre2 10.44-1.5.el10_2, pcre2-syntax 10.44-1.5.el10_2
    fixed: vendor fix RHSA-2026:81522
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) pcre2-tools 10.40-7.el9_8
    fixed: vendor fix RHSA-2026:81532
show 6 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) pcre2-tools 10.44-1.5.el10_2
    fixed: vendor fix RHSA-2026:81522
  • Red Hat Hardened Images pcre2 10.48-0.1.hum1, pcre2-tools 10.48-0.1.hum1, pcre2-utf16 10.48-0.1.hum1, pcre2-utf32 10.48-0.1.hum1, pcre2-syntax 10.48-0.1.hum1
    fixed: vendor fix RHSA-2026:67534
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1791978528, rhui5/rhua-rhel9 1791978693, rhui5/haproxy-rhel9 1791978528, rhui5/installer-rhel9 1791964013, rhui5/cds-kubernetes-rhel9 1791978534
    fixed: vendor fix RHSA-2026:82939
  • Red Hat Enterprise Linux 8 pcre2, pcre2-tools, pcre2-utf16, pcre2-utf32
    not affected: vulnerable code not present
  • Red Hat Hardened Images rust
    not affected: component not present
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-kserve-controller-rhel9, rhoai/odh-model-serving-api-rhel9, rhoai/odh-workbenches-operator-rhel9, rhoai/odh-llama-stack-k8s-operator-rhel9, rhoai/odh-kserve-llmisvc-controller-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/PCRE2Project/pcre2/security/advisories/GHSA-2p8c-ff85-vh9x referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 2.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • PCRE PCRE2

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of PCRE2Project/pcre2 published their own advisory on GitHub. Reviewed sources take precedence over it.