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Wireshark CVE-2026-76919

| EUVDEUVD-2026-63173 MEDIUM
Use of Uninitialized Variable (CWE-457)
2026-08-19 GitLab GHSA-q6rp-8q4h-v3mc
Denial Of Service Wireshark Suse
5.3
CVSS 3.1 · Vendor: GitLab
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Severity by source

Vendor (GitLab) PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
vuln.today AI
5.3 MEDIUM

Network-accessible dissector crash requires no authentication or interaction; impact is limited to availability of the Wireshark process with no confidentiality or integrity effect.

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

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

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

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 5.3

DescriptionCVE.org

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

AnalysisAI

ESS protocol dissector crash in Wireshark 4.6.0-4.6.7 and 4.4.0-4.4.18 allows unauthenticated remote denial of service by supplying malformed ESS-encapsulated packets to a live capture session or crafted PCAP file. The root cause is CWE-457 (use of uninitialized variable) within the ESS dissector, causing the Wireshark process to crash and terminating the active capture session. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Transmit crafted ESS-encapsulated packets on monitored segment
Delivery
Wireshark ESS dissector receives packet for parsing
Exploit
Uninitialized variable accessed during dissection
Execution
Process crash via null/garbage dereference
Impact
Analyst capture session terminated
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Vulnerability AssessmentAI

Exploitation Wireshark must be actively performing live network capture or parsing a PCAP file that contains ESS (Extended Security Services) protocol traffic. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L reflects a moderate network-accessible denial of service with no authentication requirement and low complexity - consistent with the ability to trigger the crash by injecting malformed ESS traffic on a monitored segment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker positioned on a network segment being monitored by a vulnerable Wireshark instance transmits specially crafted packets carrying malformed ESS protocol payloads. When Wireshark's ESS dissector processes these packets in real time, the uninitialized variable is read, causing the Wireshark process to crash abruptly and terminating the analyst's capture session. …
Remediation Upgrade Wireshark to a version beyond 4.6.7 (in the 4.6.x branch) or beyond 4.4.18 (in the 4.4.x branch) as indicated by the upper bounds of the affected version ranges; consult the vendor advisory at https://www.wireshark.org/security/wnpa-sec-2026-86.html for the exact patched release versions, which were not explicitly stated in the provided data. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-457 – Use of Uninitialized Variable

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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-2026-76919 vulnerability details – vuln.today
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