TI-2026-56244 Aliases CVE-2026-81523

Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocrypt

LOW 10CWE-74Published 2026-08-27 · Updated 2026-08-28

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00098 0th percentileScored 2026-11-07

Fix Fixed libmongocrypt (MongoDB): 1.20.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
MongoDB	libmongocrypt	1.0.0 to before 1.20.3	1.20.3	Patch available	CNA

libmongocrypt VendorMongoDB Affected 1.0.0 to before 1.20.3 Fixed in 1.20.3 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mongodb:libmongocrypt::::::::	before 1.20.3	Vulnerable	MongoDB

cpe:2.3:a:mongodb:libmongocrypt:*:*:*:*:*:*:*:* Versions before 1.20.3 Vulnerable ·MongoDB

Remediation

Fix · CNA libmongocrypt (MongoDB) Fixed in 1.20.3

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-81523

References

Patch 1

https://jira.mongodb.org/browse/MONGOCRYPT-977

Other 1

https://github.com/mongodb/libmongocrypt/releases/tag/1.20.3

TI-2026-69711 Memory corruption in MongoDB libmongocrypt with duplicate masterKey CVSS 4.0HIGH 8.7
TI-2026-58394 Persistent client crash loop via undersized FLE2 insert-update ciphertext in decryption path CVSS 4.0HIGH 7.1
TI-2026-58385 Authenticated KMS request forgery via CRLF injection in GCP key identifier strings CVSS 4.0MEDIUM 5.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences