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Wireshark CVE-2026-76884

| EUVDEUVD-2026-63141 LOW
Buffer Over-read (CWE-126)
2026-08-19 GitLab GHSA-9hh6-vc2m-phg6
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

Victim must open a crafted ERF file (UI:R, AC:H); impact is limited to crashing the Wireshark process (A:L, S:U) with no confidentiality or integrity consequence.

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:P/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

3
Analysis Generated
Aug 19, 2026 - 23:24 vuln.today
Patch available
Aug 19, 2026 - 23:04 EUVD
CVE Published
Aug 19, 2026 - 22:35 cve.org
LOW 3.1

DescriptionCVE.org

ERF file parser crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

AnalysisAI

The ERF file parser in Wireshark crashes on malformed input, enabling denial of service against analyst workstations running versions 4.4.0 through 4.4.17 and 4.6.0 through 4.6.7. Exploitation requires that a user open a specially crafted ERF capture file, and the CVSS vector (AV:N/AC:H/UI:R/A:L) reflects both the user-interaction dependency and the limited scope of impact - a crash of the Wireshark process only. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malformed ERF capture file
Delivery
Deliver file to target analyst via email or file share
Exploit
Analyst opens file in vulnerable Wireshark
Execution
ERF parser performs buffer over-read
Impact
Wireshark process crashes, disrupting analysis session

Vulnerability AssessmentAI

Exploitation The victim must actively open a specially crafted ERF format capture file within Wireshark - this is a required, explicit user action (UI:R). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS base score of 3.1 (Low) is well-supported by the full vector: AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malformed ERF capture file and delivers it to a network analyst via email, file share, or a compromised capture repository. When the analyst opens the file in a vulnerable version of Wireshark, the ERF parser performs a buffer over-read and terminates abnormally, disrupting ongoing analysis sessions. …
Remediation Upgrade to Wireshark 4.4.18 or 4.6.8, the first fixed releases in their respective stable branches, as detailed in the vendor advisory at https://www.wireshark.org/security/wnpa-sec-2026-72.html. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-76884 vulnerability details – vuln.today

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