Medium [CVE-2026-15170] Denial of service via Z39.50 protocol dissector crash
This medium-severity Red Hat Linux advisory covers CVE-2026-15170 affecting Red Hat Enterprise Linux 10, Red Hat package: wireshark.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
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 A heap buffer overflow can occur when the dissector processes malformed Z39.50 records with partial directory entries, as the pre-allocated array size is calculated using floor division and does not account for additional partial entries.
An attacker could exploit this by convincing a user to open a specially crafted packet capture file, causing Wireshark to crash. This flaw requires user interaction, specifically opening a specially crafted packet capture file, limiting its immediate impact on typical server deployments.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-131.
Affected Red Hat products: Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: wireshark.
Is CVE-2026-15170 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-15170 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-15170?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- Avoid opening capture files from untrusted sources.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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