CVE-2026-89156Public exploit

Process crash via partial JIT UTF validation

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds read in PCRE2 10.34 through 10.47 allows attackers to crash a process via invalid UTF passed to pcre2_match(). JIT validates only the subject portion it needs, but an unsupported match mode falls back to an interpreter that skips full validation and uses unchecked data as a Unicode-table index. Reachability requires the 8-bit library with Unicode and JIT, a mismatched JIT mode, nonzero start offset, lookbehind, and attacker-controlled invalid UTF.

CVSS severity2.9
Low
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in PCRE2 10.34 through 10.47 allows attackers to crash a process via invalid UTF passed to pcre2_match(). JIT validates only the subject portion it needs, but an unsupported match mode falls back to an interpreter that skips full validation and uses unchecked data as a Unicode-table index. Reachability requires the 8-bit library with Unicode and JIT, a mismatched JIT mode, nonzero start offset, lookbehind, and attacker-controlled invalid UTF.

The record

CVE
CVE-2026-89156
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
PCRE2 Project
Product
PCRE2
Classifications
CWE-125, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. 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.

  1. Affected versionversion=10.34 <10.48

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

PCRE2 Project · PCRE2version=10.34 <10.48

Published CVSS scores

2.9PCRE2 ProjectCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

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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