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.
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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.
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 12 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 12 days ago·verify at source
Mitigation checklist
- Avoid opening capture files from untrusted sources.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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