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Wireshark CVE-2026-76921

| EUVDEUVD-2026-63170 MEDIUM
Use After Free (CWE-416)
2026-08-19 GitLab GHSA-rg88-p8vc-vr4m
Use After Free Denial Of Service Memory Corruption Wireshark 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 file-open triggers crash (AV:L/UI:R); no privileges needed to run Wireshark (PR:N); impact is crash-only with no data exposure (C:N/I:N/A:H).

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

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 - 23:27 vuln.today
CVE Published
Aug 19, 2026 - 22:45 cve.org
MEDIUM 5.5

DescriptionCVE.org

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

AnalysisAI

Wireshark's CMS (Cryptographic Message Syntax) protocol dissector crashes due to a use-after-free (CWE-416) condition when processing malformed CMS packet data, affecting versions 4.6.0-4.6.7 and 4.4.0-4.4.18 and resulting in denial of service. The CVSS vector (AV:L/UI:R) confirms exploitation requires a user to open a specially crafted capture file or analyze malicious live traffic, limiting remote risk. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious CMS-bearing capture file
Delivery
Deliver file to target analyst via phishing or shared storage
Exploit
Analyst opens file in vulnerable Wireshark
Execution
CMS dissector triggers use-after-free on malformed data
Impact
Wireshark process crashes (DoS)
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target user to actively open a specially crafted packet capture file (UI:R) or configure Wireshark to capture live traffic containing maliciously formed CMS messages - the CMS dissector must be enabled (its default state). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 5.5 Medium with vector AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H accurately reflects a constrained threat model: the attack vector is local (AV:L), requiring the target user to actively open or process a crafted capture file (UI:R), and impact is confined entirely to availability (A:H - application crash). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious .pcap or .pcapng capture file embedding specially formed CMS protocol messages designed to trigger the use-after-free condition in Wireshark's CMS dissector. The file is delivered to a network analyst - via email, shared storage, or a phishing-style download - who opens it in a vulnerable Wireshark version, causing the dissector to access freed memory and crash the application. …
Remediation Upgrade Wireshark to a version beyond the affected ranges per the vendor security advisory at https://www.wireshark.org/security/wnpa-sec-2026-83.html - the fix is expected in 4.6.8 or later for the 4.6 branch and 4.4.19 or later for the 4.4 branch, but the exact patched release version must be confirmed directly from the advisory, as it was not independently listed in the provided data. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-416 – Use After Free

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Same technique Use After Free

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8
CVE-2012-4969 HIGH POC
8.1

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-2026-76921 vulnerability details – vuln.today
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