CVE-2026-89161Public exploit

Process crash via stale JIT subject ownership

Published Sep 11, 2026 · Updated Sep 11, 2026

Incorrect memory management in PCRE2 before 10.48 allows context-dependent attackers to crash an embedding process via JIT matching. pcre2_jit_match overwrites a match-data block subject without freeing an earlier PCRE2_COPY_MATCHED_SUBJECT copy or clearing its ownership flag, so later cleanup frees caller-owned memory. Direct callers must reuse match data first with copied-subject matching and then with the JIT fast path; the resulting invalid free can crash or corrupt the embedding process.

CVSS severityUnavailable
Unscored
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect memory management in PCRE2 before 10.48 allows context-dependent attackers to crash an embedding process via JIT matching. pcre2_jit_match overwrites a match-data block subject without freeing an earlier PCRE2_COPY_MATCHED_SUBJECT copy or clearing its ownership flag, so later cleanup frees caller-owned memory. Direct callers must reuse match data first with copied-subject matching and then with the JIT fast path; the resulting invalid free can crash or corrupt the embedding process.

The record

CVE
CVE-2026-89161
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
PCRE2 Project
Product
PCRE2
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

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?

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  1. Affected versionversion=0 <10.48

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

PCRE2 Project · PCRE2version=0 <10.48

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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Technologies

Your stack

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Your stack

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