CVE-2025-41086

Medium

Description

Vulnerability in the access control system of the GAMS licensing system that allows unlimited valid licenses to be generated, bypassing any usage restrictions. The validator uses an insecure checksum algorithm; knowing this algorithm and the format of the license lines, an attacker can recalculate the checksum and generate a valid license to grant themselves full privileges without credentials or access to the source code, allowing them unrestricted access to GAMS's mathematical models and commercial solvers.

SeverityMedium

CVSS6.5

Exploit probability—

ProductGams

PublishedDec 2, 2025

First seenDec 2, 2025

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

gams gams48.7.0, 49.7.0 or later

Patches

gams.com/latest/docs/RN_51.html

Affected products

Product	Affected versions	Fixed in
gams gams	v < 48.7.0, 49.1.0 ≤ v < 49.7.0	48.7.0, 49.7.0

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