CVE-2026-96423
Heap-based Buffer Overflow in 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
Fixes and workarounds
Fix
Upgrade to version 4.6.9 or above
Source: CNA: GitLabAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Wireshark Wireshark Foundation |
≥ 4.6.0; < 4.6.9 (affected, semver) ≥ 4.4.0; < 4.4.19 (affected, semver) Other versions: unaffected |
CNA: GitLab |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
NVD applicability configurations (1)
These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.
[
{
"negate": false,
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.4.19",
"versionStartIncluding": "4.4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.6.9",
"versionStartIncluding": "4.6.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
]CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.5 medium |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | CNA: GitLab |
| 3.1 / 7.1 high |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H | NVD: [email protected] |
| 3.1 / 5.5 medium |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | NVD: [email protected] |
Exploit evidence
- https://gitlab.com/wireshark/wireshark/-/work_items/21563
exploit · ADP: CISA-ADP - https://gitlab.com/wireshark/wireshark/-/work_items/21563
exploit · [email protected] - https://gitlab.com/wireshark/wireshark/-/work_items/21563
exploit · 134c704f-9b21-4f2e-91b3-4a467353bcc0
References
- https://www.wireshark.org/security/wnpa-sec-2026-108.htmlCNA: GitLab
- https://gitlab.com/wireshark/wireshark/-/work_items/21563CNA: GitLab
- https://gitlab.com/wireshark/wireshark/-/work_items/21563ADP: CISA-ADP · exploit
- https://gitlab.com/wireshark/wireshark/-/work_items/21563[email protected] · Exploit, Vendor Advisory
- https://www.wireshark.org/security/wnpa-sec-2026-108.html[email protected] · Vendor Advisory
- https://gitlab.com/wireshark/wireshark/-/work_items/21563134c704f-9b21-4f2e-91b3-4a467353bcc0 · Exploit, Vendor Advisory
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