4.4

CVE-2026-81523: mongodb libmongocrypt Injection

CVSS: 4.4v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-81523DEBIAN-CVE-2026-81523
Published 27-08-2026Last modified 28-08-2026
Open JSON

Vulnerability summary

CVE-2026-81523 is a medium (CVSS 4.4) Injection vulnerability in mongodb libmongocrypt. EPSS estimates a 0.10% chance of exploitation in the next 30 days, higher than 0.7% of scored vulnerabilities.

Overall risk
18/100
0100
Low · default modelHow is this calculated?
CVSS score
4.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.10%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 27-08-2026
    PublishedVulnerability first disclosed.
  2. 28-08-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.10%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

+0.03 pp

From 0.07% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.10%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • libmongocryptAll versions (No fix recorded) | < 1.13.2-1+deb13u1 | < 1.20.3-1
Mongodb1 product
Ubuntu1 product
  • libmongocryptAll versions (No fix recorded)

3 vendors · 3 products

References

5 links