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PatchSiren cyber security CVE debrief

CVE-2026-89158 PCRE CVE debrief

CVE-2026-89158 is a medium-severity integer overflow vulnerability in PCRE2's pcre2_compile_32 function on 32-bit platforms, leading to an out-of-bounds write. This vulnerability affects deployments using PCRE2 on 32-bit systems. Defenders of these deployments should assess exposure and apply patches to prevent potential exploitation. The CVE record and NVD entry provide details on the vulnerability. Review and apply patches for PCRE2 on 32-bit platforms, and inventory and assess exposure of 32-bit platform deployments.

Vendor
PCRE
Product
PCRE2
CVSS
MEDIUM 6.5
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 of 32-bit platform deployments using PCRE2 should assess exposure and apply patches. Operators of affected systems, platform administrators, and security teams should review and act on this vulnerability. Monitoring and detection teams should check relevant logs for exposed assets that need extra review.

Why it matters

CVE-2026-89158 is a medium-severity vulnerability in PCRE2 that affects 32-bit platforms. Defenders of these deployments should assess exposure and apply patches to prevent potential exploitation.

  • Potential for denial of service or code execution
  • Requires verification of affected versions and deployments
  • Remediation priority for 32-bit platform deployments

Technical summary

PCRE2 before 10.48 has an integer overflow vulnerability in the pcre2_compile_32 function on 32-bit platforms, leading to an out-of-bounds write. This technical issue requires verification of affected versions and deployments, and remediation priority for 32-bit platform deployments. Review compensating controls for exposed systems while remediation is scheduled and verified.

Defensive priority

Medium priority for 32-bit platform deployments

Recommended defensive actions

  • Review and apply patches for PCRE2 on 32-bit platforms
  • Inventory and assess exposure of 32-bit platform deployments
  • Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide details on the integer overflow and out-of-bounds write vulnerability in PCRE2 before 10.48 on 32-bit platforms. Evidence is limited to public CVE and NVD sources. Defenders should verify affected versions and deployments, and review official advisories for further details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-89158 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-89158

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

  • CVE-2026-89158 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-89158

    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.