Use After Free in Ettercap
CVE-2026-125400
Ettercap through 0.8.4.1 contains a use-after-free vulnerability in func_pcre() in src/ec_filter.c that reads the PCRE2 ovector after freeing match data. Network-adjacent attackers can send packets matching a loaded pcre_regex() substitution filter to corrupt memory and potentially execute code as root.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
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
Weakness classification (CWE)
References
- github.com/Ettercap/ettercap/security/advisories/GHSA-f3j5-rhhr-85j5 (vendor-advisory)
- github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98 (patch)
- github.com/Ettercap/ettercap/pull/1330 (issue-tracking, patch)
- github.com/Ettercap/ettercap/blob/v0.8.4.1/src/ec_filter.c (technical-description)
- www.vulncheck.com/advisories/ettercap-through-0.8.4.1-use-after-free-via-pcre2-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125400?
- CVE-2026-125400 is a high-severity vulnerability in Ettercap, classified under Use After Free. CVSS score: 8.8/10. Published 2026-11-10.
- How severe is CVE-2026-125400?
- High severity. CVSS v3 base score is 8.8 out of 10.