Vulnerability · Published Apr 30, 2026 · Assigned by GitLab
CVE-2026-5404Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Wireshark
Medium 4.7
In plain English
A medium-severity 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 2% 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 98.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
K12 RF5 file parser crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | wireshark | no fix listed | DEBIAN-CVE-2026-5404 |
| Debian:13 | wireshark | 4.4.15-0+deb13u1 | DEBIAN-CVE-2026-5404 |
| Debian:14 | wireshark | 4.6.5-1 | DEBIAN-CVE-2026-5404 |
| Ubuntu:24.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-5404 |
| Ubuntu:25.10 | wireshark | no fix listed | UBUNTU-CVE-2026-5404 |
| Ubuntu:26.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-5404 |
| Ubuntu:26.10 | wireshark | no fix listed | UBUNTU-CVE-2026-5404 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wireshark Foundation | Wireshark | 4.6.0 – before 4.6.54.4.0 – before 4.4.15 |
Weakness: CWE-120 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://www.wireshark.org/security/wnpa-sec-2026-15.html
- GitLab Issue #21094 issue-tracking, permissions-required