CVE catalog

CVE-2026-84969

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

[CVE catalog]

Severity: Medium · CVSS 6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Sep 3, 2026, 3:17:36 PM UTC
Updated: Sep 3, 2026, 3:17:36 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.27% · Oct 23, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	mongo-c-driver	sid	`2.5.7-1`	fixed
Debian	mongo-c-driver	forky	`2.5.6-1`	fixed
Debian	mongo-c-driver	trixie	`1.30.4-1+deb13u3`	vulnerable
Debian	mongo-c-driver	bookworm	`1.23.1-1+deb12u3`	not affected
Cpe	c_driver	Not reported	`2.5.2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	mongo-c-driver	source	sid	`2.5.2-1`	not yet assigned	Not reported	Not reported
Debian	mongo-c-driver	source	forky	`2.5.2-1`	not yet assigned	Not reported	Not reported
Debian	mongo-c-driver	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	mongo-c-driver	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Cpe	c_driver	cpe	Not reported	`2.5.2`	Not reported	NVD-CVE-2026-84969	Not reported

Notes

[trixie] mongo-c-driver: Minor issue

OpenFactory catalog packages

[Debian 13 (Trixie)]

[libbson-1.0-0t64]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.30.4-1+deb13u2 · amd64 · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
- 1.30.4-1+deb13u2 · arm64 · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
[libbson-dev]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.30.4-1+deb13u2 · amd64 · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
- 1.30.4-1+deb13u2 · arm64 · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
[libbson-doc]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.30.4-1+deb13u2 · all · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
- 1.30.4-1+deb13u2 · all · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
[libmongoc-1.0-0t64]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.30.4-1+deb13u2 · amd64 · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
- 1.30.4-1+deb13u2 · arm64 · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
[libmongoc-dev]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.30.4-1+deb13u2 · amd64 · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
- 1.30.4-1+deb13u2 · arm64 · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
[libmongoc-doc]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.30.4-1+deb13u2 · all · trixie
  Affected
  nvd · mongo-c-driver · debian · 13
- 1.30.4-1+deb13u2 · all · trixie
  Affected
  nvd · mongo-c-driver · debian · 13

[Debian 12 (Bookworm)]

[libbson-1.0-0]Not affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · amd64 · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
- 1.23.1-1+deb12u3 · arm64 · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
[libbson-dev]Not affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · amd64 · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
- 1.23.1-1+deb12u3 · arm64 · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
[libbson-doc]Not affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · all · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
- 1.23.1-1+deb12u3 · all · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
[libmongoc-1.0-0]Not affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · amd64 · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
- 1.23.1-1+deb12u3 · arm64 · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
[libmongoc-dev]Not affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · amd64 · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
- 1.23.1-1+deb12u3 · arm64 · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
[libmongoc-doc]Not affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · all · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm
- 1.23.1-1+deb12u3 · all · bookworm
  Not affected
  nvd · mongo-c-driver · debian · bookworm

Observed: Oct 23, 2026, 9:32:40 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]