Vulnerability · Published Sep 29, 2026 · Assigned by GitLab
CVE-2026-96421Improperly Controlled Sequential Memory Allocation in Wireshark
Medium 5.5
In plain English
A medium-severity security flaw 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 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.1%top 96.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
USB HID protocol dissector infinite loop and memory leak in 4.6.0 to 4.6.8 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-2026-96421 |
| Debian:13 | wireshark | 4.4.19-0+deb13u1 | DEBIAN-CVE-2026-96421 |
| Debian:14 | wireshark | 4.6.9-1 | DEBIAN-CVE-2026-96421 |
| Ubuntu:24.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-96421 |
| Ubuntu:26.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-96421 |
| Ubuntu:26.10 | wireshark | no fix listed | UBUNTU-CVE-2026-96421 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wireshark Foundation | Wireshark | 4.6.0 – before 4.6.94.4.0 – before 4.4.19 |
Weakness: CWE-1325 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H