Vulnerability · CVE-2026-96423
X11 protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service
Published Sep 29, 2026 · catalog updated Oct 14, 2026 · X11 protocol dissector crash
Check if you run it
No confirmed exploitation is on record for CVE-2026-96423. EPSS is 0.13%. Act only if a listed version of X11 protocol dissector crash is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (X11 protocol dissector crash).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.1
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.13%
- Remediation
- Advisory link
- Affected products
- cpe wireshark/wireshark
X11 protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe wireshark/wiresharkversion unspecified
How to fix CVE-2026-96423
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-96423. EPSS is 0.13%. Act only if a listed version of X11 protocol dissector crash is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-122: Heap-based Buffer Overflow; CWE-125: Out-of-bounds Read. EPSS 0.13%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 29, 2026 · NIST NVD
Detected
X11 protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service
Oct 14, 2026 · NIST NVD
Updated
X11 protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service
Sources
- CVE.orgVulnerability recordCVE-2026-96423
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-96423
30-day exploitation probability 0.1%
first.org - NIST NVDVulnerability recordCVE-2026-96423
X11 protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.