Memory corruption via pattern-conversion allocation overflow
Published Sep 11, 2026 · Updated Sep 11, 2026
Out-of-bounds write in PCRE2 10.30 through 10.47 allows attackers to crash a 32-bit process via a very large converted pattern. The pcre2_pattern_convert auto-allocation path multiplies code-unit length by a bit width, wraps the 32-bit allocation size, and writes second-pass output beyond the undersized heap buffer. Reachability requires a very large attacker-controlled foreign pattern and PCRE2-managed output allocation; the demonstrated consequence is a process crash, and the upstream advisory warns of further memory corruption.
Summary
What happened
Out-of-bounds write in PCRE2 10.30 through 10.47 allows attackers to crash a 32-bit process via a very large converted pattern. The pcre2_pattern_convert auto-allocation path multiplies code-unit length by a bit width, wraps the 32-bit allocation size, and writes second-pass output beyond the undersized heap buffer. Reachability requires a very large attacker-controlled foreign pattern and PCRE2-managed output allocation; the demonstrated consequence is a process crash, and the upstream advisory warns of further memory corruption.
The record
- CVE
- CVE-2026-89157
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- PCRE2 Project
- Product
- PCRE2
- Classifications
- CWE-787, CWE-190, T1499
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.30 <10.48
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream guarded-buffer pcre2_pattern_convert proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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