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Wireshark CVE-2026-15173

| EUVDEUVD-2026-42418 MEDIUM
Heap-based Buffer Overflow (CWE-122)
2026-07-08 cve@gitlab.com GHSA-qq69-vqh3-gr8r
Heap Overflow Denial Of Service Buffer Overflow Wireshark Red Hat Suse
5.5
CVSS 3.1 · NVD
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Severity by source

Vendor (gitlab) PRIMARY
MEDIUM
qualitative
NVD
5.5 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vuln.today AI
4.7 MEDIUM

AV:L because exploitation requires opening a local file; AC:H for required precise pcapng structure; UI:R mandatory; only availability impact from crash.

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

Primary rating from Vendor (gitlab).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
CVSS changed
Jul 09, 2026 - 19:37 NVD
4.7 (MEDIUM) 5.5 (MEDIUM)
Analysis Generated
Jul 08, 2026 - 22:17 vuln.today
Patch available
Jul 08, 2026 - 22:04 EUVD

DescriptionNVD

pcapng file parser crash in Wireshark 4.6.0 to 4.6.6 allows denial of service

AnalysisAI

The pcapng file parser in Wireshark 4.6.0 through 4.6.6 contains a heap-based buffer overflow (CWE-122) that crashes the application, resulting in denial of service. An attacker must convince a user to open a specially crafted pcapng capture file, making this a social-engineering-dependent attack with no network-facing exploitation path. No public exploit code has been identified at time of analysis and the vulnerability is not listed in CISA KEV; a vendor patch is available in Wireshark 4.6.7.

Technical ContextAI

Wireshark is a widely deployed open-source network protocol analyzer. The affected component is the pcapng (PCAP Next Generation) capture file parser, which ingests network traffic recording files in the standardized pcapng format. The root cause is CWE-122, a heap-based buffer overflow: data written to a heap-allocated buffer during pcapng parsing exceeds its allocated boundaries, corrupting adjacent heap memory and causing the process to crash. The CVSS vector AV:L reflects that exploitation requires the file to be processed in the local execution context of the Wireshark process rather than via a network-facing interface. The AC:H rating indicates that specific structural conditions in the malformed pcapng file must be met to trigger the overflow, suggesting precision crafting is necessary.

RemediationAI

The primary remediation is to upgrade Wireshark to version 4.6.7 or later, which resolves the heap-based buffer overflow in the pcapng file parser per vendor advisory wnpa-sec-2026-53 (https://www.wireshark.org/security/wnpa-sec-2026-53.html). Where immediate upgrade is not operationally feasible, organizations should enforce a policy of opening pcapng capture files only from trusted, internally generated sources, as exploitation is contingent on user interaction with a malicious file. Automated or scripted Wireshark deployments that ingest pcapng files from external or untrusted sources should be suspended or isolated until patched, as those pipelines remove the human-review safeguard that would otherwise mitigate delivery. File-type filtering at email gateways and endpoint controls can reduce the attack surface for phishing-based delivery of malicious pcapng files, though these controls do not eliminate the vulnerability. Upgrading to 4.6.7 remains the only definitive fix.

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Same weakness CWE-122 – Heap-based Buffer Overflow

View all
CVE-2023-4911 HIGH POC
7.8
CVE-2023-27997 CRITICAL
9.8
CVE-2025-24985 HIGH POC
7.8
CVE-2026-53362 HIGH POC
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 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-15173 vulnerability details – vuln.today
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