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Wireshark CVE-2026-76918

| EUVDEUVD-2026-63174 MEDIUM
Heap-based Buffer Overflow (CWE-122)
2026-08-19 GitLab GHSA-ppq5-66vm-5jvj
Heap Overflow Denial Of Service Buffer Overflow Wireshark Red Hat Suse
5.5
CVSS 3.1 · Vendor: GitLab
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Severity by source

Vendor (GitLab) PRIMARY
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 vector because exploitation requires opening a file on the analyst's system; no attacker privileges needed to craft the malicious file; user interaction mandatory; impact limited to availability only.

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
5.5 MEDIUM
qualitative

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

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

3
Patch available
Aug 20, 2026 - 01:01 EUVD
Analysis Generated
Aug 19, 2026 - 23:28 vuln.today
CVE Published
Aug 19, 2026 - 22:45 cve.org
MEDIUM 5.5

DescriptionCVE.org

SSH protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

AnalysisAI

Heap-based buffer overflow in Wireshark's SSH protocol dissector affects versions 4.6.0-4.6.7 and 4.4.0-4.4.18, crashing the application and causing denial of service. An attacker delivers a crafted network capture file or malformed live SSH traffic; when a user opens or captures it with an affected Wireshark build, the dissector overflows a heap buffer and terminates the process. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious pcap with oversized SSH fields
Delivery
Deliver file to analyst via email or file share
Exploit
Analyst opens file in affected Wireshark version
Execution
SSH dissector triggers heap-based buffer overflow
Impact
Wireshark process crashes (DoS)
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Vulnerability AssessmentAI

Exploitation The victim must be running Wireshark 4.6.0-4.6.7 or 4.4.0-4.4.18 and must actively open a crafted capture file or capture live SSH traffic containing malformed packets - the CVSS AV:L/UI:R metrics confirm both local access and user interaction are mandatory prerequisites. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 5.5 score with AV:L and UI:R accurately bounds the threat: exploitation cannot occur without the victim actively opening a crafted capture file or capturing malicious live SSH traffic on a local interface. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a pcap or pcapng file containing malformed SSH protocol data sized to overflow the heap buffer in Wireshark's SSH dissector. The file is shared with a target analyst via email or a collaborative capture-sharing platform. …
Remediation Upgrade Wireshark to a version beyond the affected ranges - above 4.6.7 in the 4.6.x branch or above 4.4.18 in the 4.4.x branch - per the vendor advisory at https://www.wireshark.org/security/wnpa-sec-2026-85.html. … 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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7.8
CVE-2025-21418 HIGH
7.8
CVE-2023-23376 HIGH
7.8
CVE-2025-24993 HIGH
7.8
CVE-2024-30085 HIGH POC
7.8

Same technique Heap Overflow

View all
CVE-2023-4911 HIGH POC
7.8
CVE-2023-27997 CRITICAL
9.8
CVE-2025-5419 HIGH POC
8.8
CVE-2026-53362 HIGH POC
7.8
CVE-2025-21418 HIGH
7.8
CVE-2023-23376 HIGH
7.8
CVE-2024-30085 HIGH POC
7.8
CVE-2023-6246 HIGH POC
8.4

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 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

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CVE-2026-76918 vulnerability details – vuln.today
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