Vulnerability · Published Jan 14, 2026 · Assigned by GitLab
CVE-2026-0961Out-of-bounds Write in Wireshark
Medium 5.5
In plain English
A medium-severity out-of-bounds write in Wireshark from Wireshark Foundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 89.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
BLF file parser crash in Wireshark 4.6.0 to 4.6.2 and 4.4.0 to 4.4.12 allows denial of service
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | wireshark | 4.4.13-0+deb13u1 | DEBIAN-CVE-2026-0961 |
| Debian:13 | wireshark | 4.4.13-0+deb13u1 | DSA-6124-1 |
| Debian:14 | wireshark | 4.6.3-1 | DEBIAN-CVE-2026-0961 |
| Ubuntu:24.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-0961 |
| Ubuntu:25.10 | wireshark | no fix listed | UBUNTU-CVE-2026-0961 |
| Ubuntu:26.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-0961 |
| Ubuntu:26.10 | wireshark | no fix listed | UBUNTU-CVE-2026-0961 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wireshark Foundation | Wireshark | 4.6.0 – before 4.6.34.4.0 – before 4.4.13 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://www.wireshark.org/security/wnpa-sec-2026-01.html
- GitLab Issue #20880 issue-tracking, permissions-required