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Fencer Intel
low 2.9

CVE-2026-89162 json

PCRE2: uninitialized memory disclosure in pcre2_serialize_encode()

published last yr. modified last mo. also EUVD-2026-75947 , GHSA-q7rw-r7qq-2hx6

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
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

In PCRE2 before 10.48, pcre2_serialize_encode might disclose two bytes to an adversary, typically in a situation where the access available to the adversary is already unsafe.

Patch / fix

  • PCRE PCRE2 10.48
  • pcre2 Debian 13 10.46-1~deb13u2
  • pcre2 Debian 14 10.48-1

debian advisories DEBIAN-CVE-2026-89162

  • pcre2 Ubuntu 26.10 10.46-1ubuntu1
  • pcre2 Ubuntu 26.04 LTS 10.46-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2026-89162

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 hummingbird 1 10.48-0.1.hum1
  • pcre2-tools hummingbird 1 10.48-0.1.hum1
  • pcre2-utf16 hummingbird 1 10.48-0.1.hum1
  • pcre2-utf32 hummingbird 1 10.48-0.1.hum1
  • pcre2-syntax hummingbird 1 10.48-0.1.hum1

red hat advisories RHSA-2026:67534

  • pcre2 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 10.45-160000.4.1

suse advisories SUSE-SU-2026:23891-1SUSE-SU-2026:23906-1

  • pcre2 openSUSE Leap 16.0 10.45-160000.4.1

opensuse advisories openSUSE-SU-2026:21938-1

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

alpine advisories ALPINE-CVE-2026-89162

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

Is CVE-2026-89162 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.

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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-2026-89162 updated cvss 2.9

pcre2: PCRE2: Information disclosure via pcre2_serialize_encode

  • Red Hat Enterprise Linux 8 Judy, galera, mariadb, mariadb-pam, mariadb-test, mariadb-backup, +8 more Red Hat Enterprise Linux 9 mariadb, mariadb-pam, mariadb-test, mariadb-backup, mariadb-common, mariadb-errmsg, +6 more Red Hat Enterprise Linux 10 mariadb11.8, mariadb10.11
    affected: workaround, no fix available “Fix deferred”
  • 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 Enterprise Linux 7 pcre2, pcre2-tools, pcre2-utf16, pcre2-utf32 Red Hat Enterprise Linux 8 pcre2, pcre2-tools, pcre2-utf16, pcre2-utf32 Red Hat Enterprise Linux 9 bootc, pcre2, pcre2-tools, pcre2-utf16, pcre2-utf32, pcre2-syntax, +3 more Red Hat Enterprise Linux 10 bootc, pcre2, mingw-pcre2, mingw32-pcre2, mingw64-pcre2 Red Hat Hardened Images rust Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    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

0.16% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/PCRE2Project/pcre2/security/advisories/GHSA-q7rw-r7qq-2hx6 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:L/I:N/A:N
NVD 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

  • PCRE PCRE2

Classification

Weakness
  • CWE-669 Incorrect Resource Transfer Between Spheres

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.