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Wireshark CVE-2026-76887

| EUVDEUVD-2026-63143 LOW
Heap-based Buffer Overflow (CWE-122)
2026-08-19 GitLab GHSA-8wh7-4hr7-v35q
Heap Overflow Denial Of Service Buffer Overflow Wireshark
3.1
CVSS 3.1 · Vendor: GitLab

Severity by source

Vendor (GitLab) PRIMARY
3.1 LOW
AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
vuln.today AI
3.1 LOW

User must actively capture or open malicious traffic (UI:R); crafting the heap overflow trigger is non-trivial (AC:H); impact is limited to a process crash with no confidentiality or integrity exposure.

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

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

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

Lifecycle Timeline

3
Analysis Generated
Aug 19, 2026 - 23:21 vuln.today
Patch available
Aug 19, 2026 - 23:04 EUVD
CVE Published
Aug 19, 2026 - 22:35 cve.org
LOW 3.1

DescriptionCVE.org

Crash in the Wireshark dissection engine in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

AnalysisAI

Wireshark's dissection engine in versions 4.4.0-4.4.17 and 4.6.0-4.6.7 contains a heap-based buffer overflow (CWE-122) that crashes the application when processing a specially crafted malformed packet, yielding a denial-of-service outcome. Exploitation requires that an analyst actively opens a malicious capture file or performs live capture of adversary-controlled traffic, making this a user-interaction-dependent, high-complexity flaw with no code execution potential. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires that the victim is running an affected Wireshark version (4.4.0-4.4.17 or 4.6.0-4.6.7) AND actively opens a malicious packet capture file or performs live capture of network traffic containing the crafted malformed packet - passive exposure is insufficient. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 3.1 (Low), vectored as AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L, reflects the genuine low priority of this vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to Wireshark 4.4.18 or 4.6.8, the versions confirmed as fixes by the EUVD ranges and vendor advisory wnpa-sec-2026-69 (https://www.wireshark.org/security/wnpa-sec-2026-69.html); the Wireshark Foundation patch is confirmed available. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-122 – Heap-based Buffer Overflow

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Same technique Heap Overflow

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CVE-2026-76887 vulnerability details – vuln.today
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