CVE catalog

CVE-2026-93393

Severity: Critical · CVSS 9.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/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, 9:17:56 PM UTC
Updated: Sep 17, 2026, 9:17:56 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.47% · Oct 23, 2026

A heap-based buffer overflow exists in the TLS transport layer of the MongoDB C Driver when built with the Windows platform TLS backend. A remote endpoint that the client connects to can cause the driver to write uncontrolled data outside the bounds of a heap allocation while processing incoming encrypted traffic after the TLS handshake completes. No authentication or user interaction is required, because the affected processing occurs before any application-level authentication completes. Triggering this issue may lead to memory corruption in the client process, disclosure of adjacent heap memory, or termination of the process.

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	`2.5.4`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	mongo-c-driver	source	sid	`2.5.5-1`	unimportant	Not reported	[1148331]
Debian	mongo-c-driver	source	forky	`2.5.5-1`	unimportant	Not reported	[1148331]
Debian	mongo-c-driver	source	trixie	`(unfixed)`	unimportant	Not reported	[1148331]
Debian	mongo-c-driver	source	bookworm	`(unfixed)`	unimportant	Not reported	[1148331]
Cpe	c_driver	cpe	Not reported	`2.5.4`	Not reported	NVD-CVE-2026-93393	Not reported

[Debian bug #1148331]

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, 8:36:57 PM UTC

References

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