CVE-2026-76879
Description
A flaw in Wireshark's C12.22 protocol dissector allows remote attackers to trigger a Denial of Service (DoS). By sending a specially crafted network packet or capture file, an attacker can crash the application, disrupting network analysis capabilities.
Statement
A denial of service flaw in Wireshark's C12.22 protocol dissector allows a remote attacker to crash the application via a crafted network packet, disrupting network analysis operations without requiring user interaction or privileges. RHEL 9 and older versions are not affected.
Mitigation
Avoid analyzing capture files or live traffic from untrusted sources. If ANSI C12.22 parsing is not required, disable the dissector by unchecking C1222 under Analyze > Enabled Protocols in Wireshark, or by executing tshark with the -d c1222,0 flag.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker that can trigger an assert statement can still lead to a denial of service if the relevant code can be triggered by an attacker, and if the scope of the assert() extends beyond the attacker's own session.
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