Vulnerability · Published Apr 30, 2026 · Assigned by GitLab
CVE-2026-6521Loop with Unreachable Exit Condition ('Infinite Loop') in Wireshark
Medium 5.5
In plain English
A medium-severity infinite loop 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 4% 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 96.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
OpenFlow v5 protocol dissector infinite loops 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-2026-6521 |
| Debian:13 | wireshark | 4.4.15-0+deb13u1 | DEBIAN-CVE-2026-6521 |
| Debian:14 | wireshark | 4.6.5-1 | DEBIAN-CVE-2026-6521 |
| Ubuntu:24.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-6521 |
| Ubuntu:25.10 | wireshark | no fix listed | UBUNTU-CVE-2026-6521 |
| Ubuntu:26.04:LTS | wireshark | no fix listed | UBUNTU-CVE-2026-6521 |
| Ubuntu:26.10 | wireshark | no fix listed | UBUNTU-CVE-2026-6521 |
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-835 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H