CVE catalog

CVE-2026-93395

Severity: Medium · CVSS 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 17, 2026, 9:17:00 PM UTC
Updated: Sep 17, 2026, 9:17:56 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.40% · Oct 23, 2026

A missing lower-bound validation in the bson_new_from_buffer() function of libbson allows an integer underflow when processing BSON data with a zero-length prefix. The function reads a 32-bit document length from the input buffer but does not verify that the value is at least 5 (the minimum valid BSON document size) before using it in an array index calculation. When the length field is zero, the expression used to check the document's null terminator wraps to UINT32_MAX, causing a heap out-of-bounds read that crashes the process. An unauthorized party who can supply crafted BSON input to an application using this API can cause a denial of service.

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`	vulnerable
Cpe	c_driver	Not reported	`2.3.1`	fixed
Ubuntu	mongo-c-driver	pro	`1.24.3-1`	vulnerable
Ubuntu	mongo-c-driver	pro	`1.24.4-1`	vulnerable
Ubuntu	mongo-c-driver	pro	`1.25.1-1`	vulnerable
Ubuntu	mongo-c-driver	pro	`1.25.2-1`	vulnerable
Ubuntu	mongo-c-driver	pro	`1.25.4-1`	vulnerable
Ubuntu	mongo-c-driver	pro	`1.26.0-1`	vulnerable
Ubuntu	mongo-c-driver	pro	`1.26.0-1.1ubuntu1`	vulnerable
Ubuntu	mongo-c-driver	pro	`1.26.0-1.1ubuntu2`	vulnerable
Ubuntu	mongo-c-driver	pro	`1.26.0-1.1ubuntu2+esm1`	vulnerable
Ubuntu	mongo-c-driver	26.04	`1.30.4-1ubuntu1`	vulnerable
Ubuntu	mongo-c-driver	26.04	`2.2.0-1`	vulnerable
Ubuntu	mongo-c-driver	26.04	`2.2.1-1`	vulnerable
Ubuntu	mongo-c-driver	26.04	`2.2.2-1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	mongo-c-driver	source	sid	`2.4.0-1`	not yet assigned	Not reported	Not reported
Debian	mongo-c-driver	source	forky	`2.4.0-1`	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	`(unfixed)`	not yet assigned	Not reported	Not reported
Cpe	c_driver	cpe	Not reported	`2.3.1`	Not reported	NVD-CVE-2026-93395	Not reported

Notes

[trixie] mongo-c-driver: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libbson-1.0-0]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · amd64 · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
- 1.23.1-1+deb12u3 · arm64 · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
[libbson-dev]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · amd64 · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
- 1.23.1-1+deb12u3 · arm64 · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
[libbson-doc]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · all · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
- 1.23.1-1+deb12u3 · all · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
[libmongoc-1.0-0]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · amd64 · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
- 1.23.1-1+deb12u3 · arm64 · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
[libmongoc-dev]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · amd64 · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
- 1.23.1-1+deb12u3 · arm64 · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
[libmongoc-doc]Affected
Source package: [mongo-c-driver]
Details (2)
- 1.23.1-1+deb12u3 · all · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12
- 1.23.1-1+deb12u3 · all · bookworm
  Affected
  nvd · mongo-c-driver · debian · bookworm; nvd · mongo-c-driver · debian · 12

[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

Observed: Oct 23, 2026, 8:36:59 PM UTC

References

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