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Wireshark CVE-2026-15170

| EUVDEUVD-2026-42413 MEDIUM
Heap-based Buffer Overflow (CWE-122)
2026-07-08 cve@gitlab.com GHSA-hfrj-29vh-pcf2
Heap Overflow Denial Of Service Buffer Overflow Wireshark
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 and UI:R reflect file-delivery or live-capture attack path; no privileges needed; impact confined to Wireshark process 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:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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

2
Analysis Generated
Jul 08, 2026 - 22:14 vuln.today
Patch available
Jul 08, 2026 - 22:04 EUVD

DescriptionCVE.org

Z39.50 protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allows denial of service

AnalysisAI

Heap-based buffer overflow in Wireshark's Z39.50 protocol dissector crashes the application when processing malformed Z39.50 PDUs, resulting in denial of service. Affected versions span the 4.4.x branch (4.4.0-4.4.16) and 4.6.x branch (4.6.0-4.6.6). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malformed Z39.50 PDU in PCAP file
Delivery
Deliver file to analyst or inject onto monitored network segment
Exploit
Analyst opens file or Wireshark processes live Z39.50 traffic
Execution
Heap buffer overflow triggered in Z39.50 dissector
Impact
Wireshark process crashes (DoS)
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Vulnerability AssessmentAI

Exploitation User interaction is required (UI:R per CVSS vector) - the victim must actively open a crafted packet capture file or have Wireshark actively dissecting live Z39.50 traffic on a monitored interface. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H scores 5.5 (Medium), reflecting that exploitation is local in attack vector, requires user interaction (opening a crafted file or observing live traffic), carries no privilege requirement, is unscoped (Wireshark process only), and yields availability impact exclusively. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious PCAP file embedding a malformed Z39.50 PDU and delivers it to a network analyst via email or a shared repository, then convinces the analyst to open it in a vulnerable Wireshark version, triggering the heap overflow and crashing the application. Alternatively, on a network segment where Z39.50 services (library catalog systems) are actively monitored, an attacker with network access could inject crafted Z39.50 packets to crash an analyst's live capture session. …
Remediation Upgrade to Wireshark 4.4.17 or 4.6.7 as documented in vendor advisory wnpa-sec-2026-58 (https://www.wireshark.org/security/wnpa-sec-2026-58.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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CVE-2026-15170 vulnerability details – vuln.today
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