CVE-2026-81523Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocrypt
Updated under an hour ago ()
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It affects MongoDB libmongocrypt. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-74
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mongodb
- NVD analysis
- Analyzed
- Record last updated
- Aug 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
MongoDB libmongocrypt mongodb:libmongocrypt (from the name) | from 1.0.0 before 1.20.3 | CNA record |
mongodb libmongocrypt mongodb:libmongocrypt | before 1.20.3 | NVD |
References
- https://jira.mongodb.org/browse/MONGOCRYPT-977vendor-advisory, issue-tracking, patch
- https://github.com/mongodb/libmongocrypt/releases/tag/1.20.3product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.