Heap overflow in KSL checksum initialization

Answer in brief

CVE-2026-79900 records a Medium severity (CVSS 6.5) vulnerability in Heap overflow in KSL checksum initialization. The current sources do not mark it as known exploited. The current feed maps Fortra/BoKS Manager boks-server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Fortra/BoKS Manager boks-server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Fortra/BoKS Manager boks-servergeneric	>=0 <8.1.0.24 \|\| >=0 <9.0.0.7	8.1.0.24, 9.0.0.7

Recommended response

Check inventory. Check lockfiles and deployed manifests for Fortra/BoKS Manager boks-server.
Review the reported fix. Source-reported 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.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Source referencefortra.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.