Vulnerability · Published Aug 19, 2026 · Assigned by GitLab
CVE-2026-76889Heap-based Buffer Overflow in Wireshark
Medium 4.7
In plain English
A medium-severity heap buffer overflow in Wireshark from Wireshark Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.1%top 97.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
UMTS FP protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | wireshark | no fix listed | DEBIAN-CVE-2026-76889 |
| Debian:13 | wireshark | 4.4.18-0+deb13u1 | DEBIAN-CVE-2026-76889 |
| Debian:14 | wireshark | 4.6.9-1 | DEBIAN-CVE-2026-76889 |
| Ubuntu:24.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-76889 |
| Ubuntu:26.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-76889 |
| Ubuntu:26.10 | wireshark | no fix listed | UBUNTU-CVE-2026-76889 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wireshark Foundation | Wireshark | 4.6.0 – before 4.6.84.4.0 – before 4.4.18 |
Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H