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PatchSiren cyber security CVE debrief

CVE-2026-89157 PCRE CVE debrief

CVE-2026-89157 is a vulnerability in PCRE2 before version 10.48, affecting 32-bit platforms. It allows for an out-of-bounds write when a large pattern is provided to the pcre2_pattern_convert function. This vulnerability could potentially lead to denial of service or code execution. Defenders should verify exposure, assess remediation feasibility, and consider compensating controls. The CVE record and NVD entry provide details on the vulnerability, but additional information on affected systems, exploitation, or specific remediation steps is limited.

Vendor
PCRE
Product
PCRE2
CVSS
MEDIUM 5.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-11
Original CVE updated
2026-09-11
Advisory published
2026-09-11
Advisory updated
2026-09-11

Who should care

Defenders responsible for systems using PCRE2 on 32-bit platforms should assess exposure and consider remediation or compensating controls. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify exposure, assess remediation feasibility, and plan for potential impacts.

Why it matters

CVE-2026-89157 is a medium-severity vulnerability in PCRE2 affecting 32-bit platforms. Defenders should verify exposure, assess remediation feasibility, and consider compensating controls.

  • Potential for denial of service or code execution.
  • Need for verification of system exposure and vulnerability.
  • Possible impact on data integrity.
  • Requires assessment of upgrade feasibility or compensating controls.

Technical summary

The vulnerability exists in PCRE2 before version 10.48 on 32-bit platforms, allowing for an out-of-bounds write in the pcre2_pattern_convert function when a large pattern is provided. This could lead to potential denial of service or code execution. Defenders should prioritize verifying exposure in systems using PCRE2 on 32-bit platforms and assess the feasibility of upgrading to version 10.48 or applying compensating controls.

Defensive priority

Defenders should prioritize verifying exposure in systems using PCRE2 on 32-bit platforms and assess the feasibility of upgrading to version 10.48 or applying compensating controls.

Recommended defensive actions

  • Verify if systems using PCRE2 on 32-bit platforms are exposed to this vulnerability.
  • Assess the feasibility of upgrading PCRE2 to version 10.48.
  • Consider applying compensating controls to mitigate potential impacts.
  • Monitor for any additional information on exploitation or remediation.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, additional information on affected systems, exploitation, or specific remediation steps is limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-89157 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-89157

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-89157 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-89157

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.