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Wireshark EUVDEUVD-2026-42423

| CVE-2026-15166 MEDIUM
Stack-based Buffer Overflow (CWE-121)
2026-07-08 cve@gitlab.com GHSA-h9wc-3j4p-q5g3
Buffer Overflow Denial Of Service Stack Overflow Wireshark
5.5
CVSS 3.1 · NVD
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Severity by source

Vendor (gitlab) PRIMARY
MEDIUM
qualitative
NVD
5.5 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vuln.today AI
5.5 MEDIUM

Local file-open vector with mandatory user interaction; attacker needs no privileges; impact is crash-only with no data exposure or scope change.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (gitlab).

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 08, 2026 - 22:12 vuln.today
Patch available
Jul 08, 2026 - 22:04 EUVD

DescriptionNVD

IEEE 802.11 protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allows denial of service

AnalysisAI

Stack-based buffer overflow in Wireshark's IEEE 802.11 (Wi-Fi) protocol dissector crashes the application, resulting in denial of service across versions 4.6.0-4.6.6 and 4.4.0-4.4.16. An attacker with the ability to deliver a malicious packet capture file, or inject crafted 802.11 frames into a live capture session, can crash the Wireshark process on a victim analyst's machine. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious 802.11 capture file
Delivery
Deliver file to analyst via email or file share
Exploit
Analyst opens file in vulnerable Wireshark
Execution
Stack buffer overflow triggered in 802.11 dissector
Impact
Wireshark process crashes (DoS)
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Vulnerability AssessmentAI

Exploitation Exploitation requires active user interaction (UI:R): the victim must open a specially crafted packet capture file in Wireshark, or perform a live IEEE 802.11 capture that includes a malicious frame injected by a proximate attacker. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 score of 5.5 (Medium) accurately reflects the constrained threat model: the local attack vector (AV:L) and mandatory user interaction (UI:R) substantially limit exploitation reach. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious IEEE 802.11 packet capture file containing a specially constructed frame designed to trigger the stack buffer overflow in Wireshark's 802.11 dissector, then delivers it to a network analyst or security researcher via email, file share, or a malicious download. The analyst opens the file in a vulnerable version of Wireshark, causing an immediate application crash. …
Remediation Upgrade Wireshark to version 4.6.7 (for users on the 4.6.x branch) or 4.4.17 (for users on the 4.4.x branch) per the vendor advisory at https://www.wireshark.org/security/wnpa-sec-2026-57.html. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-121 – Stack-based Buffer Overflow

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EUVD-2026-42423 vulnerability details – vuln.today
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