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Back to active CVEs
Medium · CVSS 5.3CVE-2026-106434

Unrecognized payload acceptance in explicit decryption in MongoDB libmongocryptCVE-2026-106434

Answer in brief

CVE-2026-106434 records a Medium severity (CVSS 5.3) vulnerability in Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt. The current sources do not mark it as known exploited. The current feed maps MongoDB/libmongocrypt (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 8, 2026Updated Oct 8, 2026Source checked Oct 8, 2026First seen by HOL Oct 8, 2026Material review Oct 8, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps MongoDB/libmongocrypt (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
MongoDB/libmongocryptgeneric>=1.5.0 <1.20.51.20.5

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for MongoDB/libmongocrypt.
  2. 2Review the reported fix. Update MongoDB/libmongocrypt to 1.20.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 8, 2026

Sources and claim methodology

  • Source referencejira.mongodb.org
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Application denial of service via malformed KMS endpoint in MongoDB libmongocryptSame mongodb/libmongocrypt package
  • Heap corruption via duplicate masterKey fields in MongoDB libmongocryptSame mongodb/libmongocrypt package
  • Fail-open response masking in Docker Sandboxes can expose proxy-managed credentialsSame generic ecosystem
  • TVU Networks Receiver/Transceiver Authentication Bypass via /tvu/LoginSame generic ecosystem
  • TVU Networks Receiver/Transceiver Missing Authentication via REST APISame generic ecosystem
  • Docker Sandboxes egress proxy could forward unrecognized client credentials to managed hostsSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-354
Source
CVE List V5
Source checked
Oct 8, 2026
References
1 linked source
Open source record