Medium [CVE-2026-76928] Denial of Service via X.509IF protocol dissector crash
This medium-severity Red Hat Linux advisory covers CVE-2026-76928 affecting Red Hat Enterprise Linux 10, Red Hat package: wireshark.
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Summary
X.509IF protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service By providing a specially crafted capture file or network stream, an attacker can crash the application, making it unavailable. The impact is limited strictly to Wireshark's availability and does not affect the host system.
RHEL 9 and older versions are not affected. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
Weakness: CWE-825. Affected Red Hat products: Red Hat Enterprise Linux 10.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: 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 10 days 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 10 days ago·verify at source
Mitigation checklist
- Avoid opening untrusted capture files or monitoring untrusted networks where malformed packets may be broadcast. If X.509IF protocol analysis is not required, disable the dissector. In Wireshark, navigate to Analyze > Enabled Protocols and uncheck X.509IF, or run tshark using the flag -d x509if,0 to bypass this dissector entirely.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
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