CVE-2026-79900: CWE-787 Out-of-bounds write in Fortra BoKS Manager boks-server
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.
AI Analysis
Technical Summary
The vulnerability in Fortra BoKS Manager boks-server (CVE-2026-79900) involves the boks_ksllogsd process accepting a checksum algorithm name in the MD field of an authenticated KSL start message. While affected versions verify that OpenSSL recognizes the digest name, they fail to ensure the digest name fits within a fixed 16-byte checksum context field before copying it. This allows an authenticated KSL client to supply an oversized digest name recognized by OpenSSL, leading to an out-of-bounds write beyond the allocated heap memory.
Potential Impact
This vulnerability can cause a heap-based buffer overflow resulting in potential denial of service (application crash) or other undefined behavior. The CVSS score of 6.5 indicates a medium severity with no confidentiality or integrity impact but a high impact on availability. Exploitation requires authentication and no user interaction is needed.
Mitigation Recommendations
No official patch or fix is currently confirmed. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to authenticated KSL clients and monitor for unusual behavior related to checksum algorithm names in KSL start messages.
CVE-2026-79900: CWE-787 Out-of-bounds write in Fortra BoKS Manager boks-server
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.
CVSS v3.1
Score 6.5medium
Affected software
Fortra
BoKS Manager boks-server
pkg:github/fortra/boks-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Fortra BoKS Manager boks-server (CVE-2026-79900) involves the boks_ksllogsd process accepting a checksum algorithm name in the MD field of an authenticated KSL start message. While affected versions verify that OpenSSL recognizes the digest name, they fail to ensure the digest name fits within a fixed 16-byte checksum context field before copying it. This allows an authenticated KSL client to supply an oversized digest name recognized by OpenSSL, leading to an out-of-bounds write beyond the allocated heap memory.
Potential Impact
This vulnerability can cause a heap-based buffer overflow resulting in potential denial of service (application crash) or other undefined behavior. The CVSS score of 6.5 indicates a medium severity with no confidentiality or integrity impact but a high impact on availability. Exploitation requires authentication and no user interaction is needed.
Mitigation Recommendations
No official patch or fix is currently confirmed. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to authenticated KSL clients and monitor for unusual behavior related to checksum algorithm names in KSL start messages.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Fortra
- Date Reserved
- 2026-08-25T14:50:14.032Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abe7481a43b0b3b89bcf0f4
Added to database: 10/01/2026, 14:56:01 UTC
Last enriched: 10/01/2026, 15:08:06 UTC
Last updated: 10/01/2026, 23:06:16 UTC
Views: 5
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