CVE-2026-89161: In PCRE2 before 10.48, pcre2_jit_match mishandles a previously copied subject being passed in as a context

Q: How do I fix CVE-2026-89161?

pcre2: upgrade to 10.48. Exact commands for each OS are on this page.

Q: Is CVE-2026-89161 being exploited?

CVE-2026-89161 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-89161 affect?

CVE-2026-89161 affects pcre2. Severity is high (CVSS 7.4). In PCRE2 before 10.48, pcre2_jit_match mishandles a previously copied subject being passed in as a context. An incorrect free operation can occur.

Routine

HIGH 7.4UPGRADE

CVE-2026-89161 is a high-severity flaw (CVSS 7.4) affecting pcre2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In PCRE2 before 10.48, pcre2_jit_match mishandles a previously copied subject being passed in as a context. An incorrect free operation can occur.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-590
Published	2026-09-11
Last modified	2026-09-16

Publisher (CNA): MITRE · Vendor: pcre

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-11 04:18 UTCPublished CVE record published
2026-09-16 19:10 UTCUpdated Record last modified

pcre pcre2 UPGRADE

Affected: < 10.48 · 10.48 rc1

Fixed in: 10.48

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pcre2 || rpm -q pcre2 || pcre2 --version

2. UPGRADE to 10.48 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pcre2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pcre2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-89161?

pcre2: upgrade to 10.48. Exact commands for each OS are on this page.

Is CVE-2026-89161 being exploited?

CVE-2026-89161 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-89161 affect?

CVE-2026-89161 affects pcre2. Severity is high (CVSS 7.4). In PCRE2 before 10.48, pcre2_jit_match mishandles a previously copied subject being passed in as a context. An incorrect free operation can occur.

How urgent is CVE-2026-89161?

Priority 26/100. High severity

Related CVEs

CVE-2026-89156 LOW 2.9 UPGRADE PCRE2 before 10.48 has a pcre2_match out-of-bounds read after a JIT fallback when an attacker can provide inva
CVE-2026-89157 MEDIUM 5.7 UPGRADE PCRE2 before 10.48, on 32-bit platforms, has a pcre2_pattern_convert out-of-bounds write when an attacker can
CVE-2026-89158 MEDIUM 6.5 UPGRADE PCRE2 before 10.48, on 32-bit platforms, has a pcre2_compile_32 integer overflow and resultant out-of-bounds w
CVE-2026-89160 LOW 3.7 UPGRADE PCRE2 before 10.48 has a pcre2_match out-of-bounds read during the PCRE2_MATCH_INVALID_UTF matching of an inva
CVE-2026-89162 LOW 2.9 UPGRADE In PCRE2 before 10.48, pcre2_serialize_encode might disclose two bytes to an adversary, typically in a situati

References

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