Vulnerability · Published Aug 19, 2026 · Assigned by GitLab
CVE-2026-76886Heap-based Buffer Overflow in Wireshark
High 8.1
In plain English
A high-severity heap buffer overflow 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 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.4%top 67.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
C12.22 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 |
|---|---|---|---|
| AlmaLinux:10 | wireshark | 1:4.4.2-10.el10_2.8 | ALSA-2026:84721 |
| AlmaLinux:8 | wireshark | 1:2.6.2-21.el8_10 | ALSA-2026:83657 |
| AlmaLinux:9 | wireshark | 1:3.4.10-9.el9_8.5 | ALSA-2026:83546 |
| AlmaLinux:10 | wireshark-cli | 1:4.4.2-10.el10_2.8 | ALSA-2026:84721 |
| AlmaLinux:8 | wireshark-cli | 1:2.6.2-21.el8_10 | ALSA-2026:83657 |
| AlmaLinux:9 | wireshark-cli | 1:3.4.10-9.el9_8.5 | ALSA-2026:83546 |
| AlmaLinux:10 | wireshark-devel | 1:4.4.2-10.el10_2.8 | ALSA-2026:84721 |
| AlmaLinux:8 | wireshark-devel | 1:2.6.2-21.el8_10 | ALSA-2026:83657 |
| AlmaLinux:9 | wireshark-devel | 1:3.4.10-9.el9_8.5 | ALSA-2026:83546 |
| Debian:12 | wireshark | no fix listed | DEBIAN-CVE-2026-76886 |
| Debian:13 | wireshark | 4.4.18-0+deb13u1 | DEBIAN-CVE-2026-76886 |
| Debian:14 | wireshark | 4.6.9-1 | DEBIAN-CVE-2026-76886 |
| Rocky Linux:10 | wireshark | 1:4.4.2-10.el10_2.8 | RLSA-2026:84721 |
| Rocky Linux:8 | wireshark | 1:2.6.2-21.el8_10 | RLSA-2026:83657 |
| Rocky Linux:9 | wireshark | 1:3.4.10-9.el9_8.5 | RLSA-2026:83546 |
| Ubuntu:24.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-76886 |
| Ubuntu:26.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-76886 |
| Ubuntu:26.10 | wireshark | no fix listed | UBUNTU-CVE-2026-76886 |
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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H