CVE-2026-106434: medium-severity vulnerability in MongoDB libmongocrypt
Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.1%
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/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-2026-106433HIGHHeap 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-2026-81523LOWCross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocryptEPSS 0.1%