Vulnerability/
REDHAT-BUG-2543797

REDHAT-BUG-2543797: High severity PCRE2 PCRE2 vulnerability

Q: Which deployments should be prioritized for investigation?

Deployments using PCRE2 versions before 10.49 should be investigated if they compile or execute attacker-controlled regular expressions and use the affected JIT API pattern.

Q: What level of attacker control is required?

An attacker must be able to supply the regular expression. Exploitation also depends on the application using certain JIT APIs; the available data does not identify the specific API calls or configurations.

Published Sep 30, 2026

Updated

PCRE2 before 10.49, when there is an attacker-controlled regular expression and certain JIT API usage, allows an out-of-bounds write with arbitrary data.

Affected Software

1 affected component

PCRE2 PCRE2<10.49

Event History

Sep 30, 2026

Data Sourced

via Red Hat·04:41 AM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which deployments should be prioritized for investigation?

Deployments using PCRE2 versions before 10.49 should be investigated if they compile or execute attacker-controlled regular expressions and use the affected JIT API pattern.

What level of attacker control is required?

An attacker must be able to supply the regular expression. Exploitation also depends on the application using certain JIT APIs; the available data does not identify the specific API calls or configurations.

Company

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Contact

SecAlerts Pty Ltd.
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Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

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