{"id":"CVE-2026-106429","title":"An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process","summary":"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 c…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-191"],"published":"2026-10-08","updated":"2026-10-08","sourceUpdated":"2026-10-08T20:49:23.240","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106429","references":[{"url":"https://jira.mongodb.org/browse/MONGOCRYPT-986","label":"cna@mongodb.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106429.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-106429"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-106429"}],"tags":["nvd","csaf","vex","red-hat","cve.org"],"ingestedAt":"2026-10-08T20:06:22.181Z","vendor":"Red Hat","epss":0.0029,"epssPercentile":0.21398,"product":"libmongocrypt","affected":["libmongocrypt >= 1.1.0 < 1.20.5"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-08T19:29:53.569305Z"},"slug":"CVE-2026-106429","body":"## Overview\n\nAn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106429.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}