CVE-2026-84969CWE-787

CVE-2026-84969

Low · published September 3, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
18.3
In the wild
Unconfirmed
What it is

A memory-handling error in the BSON-to-JSON conversion helpers of the MongoDB C Driver can write a small number of bytes past the end of a heap buffer when a binary field is encoded and the output is cut short at a caller-configured length limit. A party who supplies the document content, with no privileges on the application that links the driver, may cause a small amount of data outside the intended buffer to be altered.

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
6.3 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00271 · 18.3th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-09-03T19:17Z
Affected products (2)
ProductVersionsFixed in
mongodb/c_driver≥ 1.30.0, < 1.30.91.30.9
mongodb/c_driver≥ 2.0.0, < 2.5.22.5.2
References (1)
https://jira.mongodb.org/browse/CDRIVER-6410 · [email protected]
EPSS history
Timeline
  • 05 SEP 03:44Z
    EPSS moved — → 0%
    epss
  • 03 SEP 14:59Z
    Heap overflow via truncated base64 encoding of binary fields in length-limited JSON output
    cvelistv5