CVE-2026-86145

What it is

PCRE2 before 10.48 allows a pcre2_dfa_match out-of-bounds write because reuse of a cached workspace block, in a recursive DFA matching workspace, lacks a size check (even though a newly allocated block, for the same purpose, does have a size check). This outcome requires an attacker-controlled regular expression, or a recursive pattern in conjunction with a small heap limit (this can be set through the API).

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data tampering.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-05 06:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-09 16:04 UTC Last updatedMost recent change to the record

Details

Published

2026-09-05 06:17 UTC

Last modified

2026-09-09 16:04 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-424

Record status

Deferred

Attack profile CVSS 3.1 · 8.2

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

Low