Medium [CVE-2026-76881] Denial of service via CMS protocol dissector crash
This medium-severity Red Hat Linux advisory covers CVE-2026-76881 affecting Red Hat Enterprise Linux 10, Red Hat package: wireshark.
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Summary
A flaw was found in Wireshark. A NULL pointer dereference vulnerability exists within the CMS (Cryptographic Message Syntax) protocol dissector.
This issue can be triggered by processing a specially crafted network capture file, leading to an application crash. A remote attacker could exploit this to cause a denial of service (DoS).
Red Hat Enterprise Linux 6, 7, 8, and 9 ship Wireshark versions prior to the affected range and are not vulnerable. Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H).
Weakness: CWE-476. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat package: wireshark.
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 53 minutes 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 53 minutes ago·verify at source
Mitigation checklist
- Do not open untrusted packet capture files or capture traffic from untrusted networks with Wireshark.
Official advisory · high-confidence parse· fetched 53 minutes ago·verify at source
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