What is CVE-2026-67991?

CVE-2026-67991 is a high-severity vulnerability in N/a, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-08-13.

How severe is CVE-2026-67991?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in N/a

CVE-2026-67991

crmne/ruby_llm at commit fa6f279847d6d7027814539d9c0dfc3bbdfd2a83 contains a polynomial-time regular expression denial-of-service condition in RubyLLM::Utils.underscore on Ruby 3.1.x. A very long crafted class, agent, or tool name can caus…

Vulnerability class: ReDoS (Regular Expression Denial of Service)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-67991?: CVE-2026-67991 is a high-severity vulnerability in N/a, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-08-13.
How severe is CVE-2026-67991?: High severity. CVSS v3 base score is 7.5 out of 10.