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Wireshark CVE-2026-76886

| EUVDEUVD-2026-63142 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-08-19 GitLab GHSA-wrhv-64xq-9g54
Heap Overflow Denial Of Service Buffer Overflow Wireshark Suse
8.1
CVSS 3.1 · Vendor: GitLab
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Severity by source

Vendor (GitLab) PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
5.9 MEDIUM

Confirmed impact is crash only (DoS); C:H and I:H are not supported by described behavior, so both set to N.

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

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

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

Lifecycle Timeline

3
Analysis Generated
Aug 19, 2026 - 23:23 vuln.today
Patch available
Aug 19, 2026 - 23:04 EUVD
CVE Published
Aug 19, 2026 - 22:35 cve.org
HIGH 8.1

DescriptionCVE.org

C12.22 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 C12.22 protocol dissector causes an application crash, enabling denial of service against analysts actively dissecting C12.22 traffic. Affected are Wireshark 4.4.0 through 4.4.17 and 4.6.0 through 4.6.7 (CPE: cpe:2.3:a:wireshark_foundation:wireshark:*:*:*:*:*:*:*:*), with vendor-released patches available as 4.4.18 and 4.6.8 per ENISA EUVD-2026-63142. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malformed C12.22 protocol packet
Delivery
Inject packet onto analyst-monitored network segment
Exploit
Wireshark captures and queues packet
Execution
C12.22 dissector invoked on malformed frame
Persist
Heap buffer overflow triggered
Impact
Wireshark process crashes
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target to be running a vulnerable Wireshark version (4.4.0-4.4.17 or 4.6.0-4.6.7) AND actively dissecting C12.22 protocol traffic. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, score 8.1) presents a notable inconsistency: the description explicitly describes a crash yielding denial of service, yet C:H and I:H are assigned - impacts not supported by the stated behavior alone. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with access to a network segment being monitored by a Wireshark analyst - for example, a compromised smart meter or a rogue device on an AMI network - injects a crafted malformed C12.22 packet into the traffic stream. When the analyst's vulnerable Wireshark instance processes the packet, the C12.22 dissector triggers a heap-based buffer overflow, causing Wireshark to crash and interrupting network analysis. …
Remediation Upgrade to Wireshark 4.4.18 (for users on the 4.4.x branch) or 4.6.8 (for users on the 4.6.x branch), as confirmed by the vendor advisory at https://www.wireshark.org/security/wnpa-sec-2026-75.html. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Wireshark installations across security operations and identify which versions are in use, prioritizing those running 4.4.0-4.4.17 or 4.6.0-4.6.7. …

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Same weakness CWE-122 – Heap-based 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 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-2026-76886 vulnerability details – vuln.today
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