libmongocrypt: An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that...
CVE-2026-106429 is fixed in libmongocrypt on 1 platform by DEBIAN-CVE-2026-106429 (version 1.20.5-1), released October 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libmongocrypt · Debian 14 | 1.20.5-1 | DEBIAN-CVE-2026-106429 | Oct 16, 2026 |
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