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Wireshark sharkd CVE-2026-76891

| EUVDEUVD-2026-63162 LOW
Expired Pointer Dereference (CWE-825)
2026-08-19 GitLab GHSA-wmqm-vgc4-jrp6
Denial Of Service 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

Network-accessible sharkd with no authentication required, but high complexity and mandatory user interaction constrain exploitation; impact is availability-only and limited.

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:P/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

2
Patch available
Aug 20, 2026 - 01:01 EUVD
Analysis Generated
Aug 19, 2026 - 23:29 vuln.today

DescriptionCVE.org

Crash in sharkd in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

AnalysisAI

Denial of service via crash in sharkd, Wireshark's daemon-mode component, affects versions 4.6.0-4.6.7 and 4.4.0-4.4.18. An unauthenticated remote attacker with high-complexity exploitation conditions and required user interaction can cause sharkd to crash by submitting crafted input, resulting in limited availability impact. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious capture file or RPC payload
Delivery
Deliver to target sharkd instance
Exploit
User or frontend initiates analysis session
Execution
Expired pointer dereference triggered in parser
Persist
sharkd process crashes
Impact
Denial of service achieved
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target system is running sharkd (Wireshark's daemon mode), which is not enabled by default in standard desktop Wireshark installations - it must be explicitly invoked or configured as a service. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L yields a base score of 3.1 (Low), which accurately characterises the constrained risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker delivers a maliciously crafted packet capture file or specially structured JSON-RPC request to a sharkd instance accessible over the network. When a user or automated frontend initiates an analysis session that processes the crafted input, the expired pointer dereference is triggered, causing sharkd to crash and interrupting any ongoing packet analysis. …
Remediation Patch available per vendor advisory at https://www.wireshark.org/security/wnpa-sec-2026-64.html - consult the advisory for the exact patched release versions for the 4.4.x and 4.6.x branches, as specific fix version numbers are not independently confirmed from the available data. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-76891 vulnerability details – vuln.today
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