What is CVE-2026-89158?

CVE-2026-89158 is a medium-severity vulnerability in Pcre Pcre2, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2026-09-11.

How severe is CVE-2026-89158?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Integer overflow in Pcre Pcre2

CVE-2026-89158

PCRE2 before 10.48, on 32-bit platforms, has a pcre2_compile_32 integer overflow and resultant out-of-bounds write.

Vulnerability class: Integer Overflow

Published 2026-09-11 · last modified 2026-09-16.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L.

EPSS exploit prediction

EPSS: 0.002 (15.8th percentile), scored 2026-10-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Pcre Pcre2 — versions 10.48

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

github.com/PCRE2Project/pcre2/releases/tag/pcre2-10.48 (Release Notes)
github.com/PCRE2Project/pcre2/security/advisories/GHSA-fmgr-6ggq-9859 (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-89158?: CVE-2026-89158 is a medium-severity vulnerability in Pcre Pcre2, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2026-09-11.
How severe is CVE-2026-89158?: Medium severity. CVSS v3 base score is 6.5 out of 10.