CVE-2026-125402 json
Ettercap through 0.8.4.1 Heap Out-of-Bounds Read via TLS SNI Parsing
published 6d ago modified yesterday also EUVD-2026-120565 , GHSA-v48w-7cvh-c7f4
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository Ettercap/ettercap. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 16%
- public exploits
- 0
- none known
Summary
Ettercap through 0.8.4.1 contains a heap out-of-bounds read vulnerability in sslw_get_clienthello_sni() in src/ec_sslwrap.c that trusts the unchecked 16-bit SNI length field. Network-adjacent attackers can send crafted TLS ClientHello messages during SSL interception to leak up to 64 KB of heap memory upstream or crash Ettercap.
Patch / fix
- github.com/Ettercap/ettercap@1d8badb commit
- github.com/Ettercap/ettercap#1330 pull request
Is CVE-2026-125402 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.2 | CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| CNA | 4.0 | 7.2 | CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 8.1 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
Affected products
- Ettercap ettercap
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
github.com
/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98
patch
-
github.com
/Ettercap/ettercap/pull/1330
issue-tracking, patch
-
github.com
/Ettercap/ettercap/security/advisories/GHSA-v48w-7cvh-c7f4
vendor-advisory, advisory
-
github.com
/Ettercap/ettercap/blob/v0.8.4.1/src/ec_sslwrap.c#L589-L604
technical-description
-
vulncheck.com
/advisories/ettercap-through-0.8.4.1-heap-out-of-bounds-read-via-tls-sni-parsing
third-party-advisory
Sources
- CVE List CVE-2026-125402
- NVD CVE-2026-125402
- Maintainer advisory GHSA-v48w-7cvh-c7f4
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of Ettercap/ettercap published their own advisory on GitHub. Reviewed sources take precedence over it.