High [CVE-2026-76879] Denial of Service via C12.22 protocol dissector crash
This high-severity Red Hat Linux advisory covers CVE-2026-76879.
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Summary
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 A flaw was found in Wireshark. A remote attacker could exploit a vulnerability in the C12.22 protocol dissector, which is responsible for interpreting network traffic.
By sending a specially crafted network packet, an attacker could cause the Wireshark application to crash, leading to a denial of service (DoS). This prevents the legitimate use of the network analysis tool.
A remote attacker can trigger a crash by sending a specially crafted network packet, disrupting network analysis operations. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-617. Under investigation: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- To reduce the risk of exploitation, avoid analyzing untrusted network capture files with Wireshark. It is also recommended to run Wireshark within a sandboxed environment to limit the potential impact of a denial of service.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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