CVE-2026-106433: high-severity vulnerability in MongoDB libmongocrypt
Heap corruption via duplicate masterKey fields 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 8.7epss 0.3%
Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible type when cleaning up a key document containing duplicate masterKey fields. An authenticated actor who can modify key vault documents, or a server that returns such a key document, can cause invalid memory access and invalid frees in the client process. This can terminate the application or corrupt process memory.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
MongoDB · libmongocryptRelated CVEs — MongoDB libmongocrypt
In the same product, most dangerous first.
CVE-2026-106429HIGHApplication denial of service via malformed KMS endpoint in MongoDB libmongocryptEPSS 0.3%CVE-2026-114655MEDIUMKMS request injection via unsanitized key vault and provider values in 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%