CVE-2026-106429: high-severity vulnerability in MongoDB libmongocrypt
Application denial of service via malformed KMS endpoint in MongoDB libmongocrypt
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.3%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
MongoDB · libmongocryptRelated CVEs — MongoDB libmongocrypt
In the same product, most dangerous first.
CVE-2026-114655MEDIUMKMS request injection via unsanitized key vault and provider values in libmongocryptEPSS 0.3%CVE-2026-106433HIGHHeap corruption via duplicate masterKey fields in MongoDB libmongocryptEPSS 0.3%CVE-2026-84971HIGHPersistent client crash loop via undersized FLE2 insert-update ciphertext in decryption pathEPSS 0.3%CVE-2026-84962MEDIUMAuthenticated KMS request forgery via CRLF injection in GCP key identifier stringsEPSS 0.2%CVE-2026-106434MEDIUMUnrecognized payload acceptance in explicit decryption in MongoDB libmongocryptEPSS 0.1%CVE-2026-81523LOWCross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocryptEPSS 0.1%