What is CVE-2026-103111?

CVE-2026-103111 is a high-severity vulnerability in Pcre Pcre2, classified under Out-of-bounds Write. CVSS score: 7.6/10. Published 2026-09-30.

How severe is CVE-2026-103111?

High severity. CVSS v3 base score is 7.6 out of 10.

Buffer overflow in Pcre Pcre2

CVE-2026-103111

PCRE2 before 10.49, when there is an attacker-controlled regular expression and certain JIT API usage, allows an out-of-bounds write with arbitrary data.

Vulnerability class: Buffer Overflow

Published 2026-09-30.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Pcre Pcre2

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/PCRE2Project/pcre2/security/advisories/GHSA-r9hj-j2rw-4q3m

Frequently asked questions

What is CVE-2026-103111?: CVE-2026-103111 is a high-severity vulnerability in Pcre Pcre2, classified under Out-of-bounds Write. CVSS score: 7.6/10. Published 2026-09-30.
How severe is CVE-2026-103111?: High severity. CVSS v3 base score is 7.6 out of 10.