CVE-2026-79900

Heap overflow in KSL checksum initialization

Published Oct 1, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
boks_ksllogsd accepts a checksum algorithm name in the MD field of an authenticated KSL start message. Affected releases verify that OpenSSL recognizes the digest name but do not verify that the value fits in a fixed 16-byte checksum context field before copying it. An authenticated KSL client can supply an oversized, OpenSSL-recognized digest name and write beyond the end of the heap allocation.

Remediation

Vendor Solution

Upgrade to boks-server 8.1.0.24 or boks-server 9.0.0.7, as appropriate for the installed maintenance line, and ensure the updated boks_ksllogsd is running.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Fortra
Fortra boks Manager Boks-server
Vendors & Products Fortra
Fortra boks Manager Boks-server
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description boks_ksllogsd accepts a checksum algorithm name in the MD field of an authenticated KSL start message. Affected releases verify that OpenSSL recognizes the digest name but do not verify that the value fits in a fixed 16-byte checksum context field before copying it. An authenticated KSL client can supply an oversized, OpenSSL-recognized digest name and write beyond the end of the heap allocation.
Title Heap overflow in KSL checksum initialization
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Fortra
Published
Updated
Oct 1, 2026, 2:42 PM
Reserved
Aug 25, 2026, 2:50 PM
Status
Awaiting Analysis
Published
Oct 1, 2026, 3:17 PM
Modified
Oct 1, 2026, 8:34 PM