PCRE PCRE2 up to 10.47 Recursive DFA Matching Workspace pcre2_dfa_match out-of-bounds write

Summaryinfo

A vulnerability was found in PCRE PCRE2 up to 10.47. It has been declared as critical. This issue affects the function pcre2_dfa_match of the component Recursive DFA Matching Workspace. The manipulation results in out-of-bounds write. This vulnerability is identified as CVE-2026-86145. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in PCRE PCRE2 up to 10.47. Affected is the function pcre2_dfa_match of the component Recursive DFA Matching Workspace. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on integrity, and availability. CVE summarizes:

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).

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-86145 since 09/05/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 343097 (Linux Distros Unpatched Vulnerability : CVE-2026-86145), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 10.48 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (343097) and CERT Bund (WID-SEC-2026-3334). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Open Source PCRE (Perl Compatible Regular Expressions)

Productinfo

Type

• Programming Tool Software

Vendor

• PCRE

Name

• PCRE2

Version

• 10.0
• 10.1
• 10.2
• 10.3
• 10.4
• 10.5
• 10.6
• 10.7
• 10.8
• 10.9
• 10.10
• 10.11
• 10.12
• 10.13
• 10.14
• 10.15
• 10.16
• 10.17
• 10.18
• 10.19
• 10.20
• 10.21
• 10.22
• 10.23
• 10.24
• 10.25
• 10.26
• 10.27
• 10.28
• 10.29
• 10.30
• 10.31
• 10.32
• 10.33
• 10.34
• 10.35
• 10.36
• 10.37
• 10.38
• 10.39
• 10.40
• 10.41
• 10.42
• 10.43
• 10.44
• 10.45
• 10.46
• 10.47

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion