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Wireshark CVE-2026-15166

| EUVDEUVD-2026-42423 MEDIUM
Stack-based Buffer Overflow (CWE-121)
2026-07-08 cve@gitlab.com GHSA-h9wc-3j4p-q5g3
Buffer Overflow Denial Of Service Stack Overflow Red Hat Wireshark Suse
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
SUSE
MEDIUM
qualitative
Red Hat
5.7 MEDIUM
qualitative

Primary rating from Vendor (gitlab).

CVSS VectorNVD

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. No public exploit code has been identified at time of analysis and the vulnerability is not listed in the CISA KEV catalog; vendor-released patches (4.6.7 and 4.4.17) are available.

Technical ContextAI

Wireshark's IEEE 802.11 dissector - the component responsible for parsing Wi-Fi management, control, and data frames - contains a CWE-121 stack-based buffer overflow. Insufficient bounds checking during frame dissection allows a specially crafted 802.11 frame to write beyond the bounds of a stack-allocated buffer. Because the overflow occurs during dissector parsing (triggered by opening a .pcap/.pcapng file or processing a live capture), the crash is deterministic and does not require kernel interaction or privilege escalation. The vulnerability is confirmed across two stable release branches: the 4.6.x series (up to 4.6.6) and the 4.4.x series (up to 4.4.16), as established by ENISA EUVD-2026-42423 and the Wireshark vendor advisory wnpa-sec-2026-57.

RemediationAI

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. As a compensating control where immediate patching is not feasible, avoid opening packet capture files received from untrusted or external sources until the patch is applied - this directly eliminates the primary attack vector without impacting normal network capture workflows. As a secondary measure, disabling the IEEE 802.11 protocol dissector in Wireshark's preferences (Analyze > Enabled Protocols, uncheck IEEE 802.11) will prevent triggering the vulnerable code path, at the cost of losing Wi-Fi frame decoding capability. Restricting Wireshark execution to capture files from trusted internal sources further narrows the attack surface.

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Same weakness CWE-121 – Stack-based Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-15166 vulnerability details – vuln.today
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