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No exploitation reportedFix available

CVE-2026-93395

No exploitation reported by the sources we read.

  • Published2026-09-17
  • Fixed in2.3.1
  • WeaknessCWE-191

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-09-1721:17CVE publishedNVD

Versions per branch

NVD
Mongodb c driver
BranchAffectedFixed in
2.x≥ 2.0.0, < 2.3.12.3.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • mongo-c-driverUbuntu:Pro:24.04:LTSall versions · no fixed version listed
  • mongo-c-driverUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • mongo-c-driverUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • mongo-c-driverUbuntu:26.04:LTSall versions · no fixed version listed
  • mongo-c-driveropenEuler:24.03-LTS-SP4all versions · fixed in 1.30.13-1.oe2403sp4
  • mongo-c-driveropenEuler:24.03-LTS-SP3all versions · fixed in 1.30.13-1.oe2403sp3
  • mongo-c-driveropenEuler:24.03-LTS-SP1all versions · fixed in 1.30.13-1.oe2403sp1
  • mongo-c-driveropenEuler:22.03-LTS-SP4all versions · fixed in 1.30.13-1.oe2203sp4

3 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Mongodb c driver to 2.3.1

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-09-18
  • CNACVSS 4.06.9known since 2026-10-23
  • CNACVSS 3.15.3known since 2026-10-23
  • CNAweakness (CWE)CWE-191known since 2026-10-23
  • FIRST EPSSEPSS score0.4 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 4.0 vector
CVSS: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
2026-09-17
Last Modified
2026-09-25
NVD status
Analyzed
GitHub Advisory
GHSA-jm9m-v7jc-m4j8

Frequently asked questions

What is CVE-2026-93395?

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.

Is CVE-2026-93395 actively exploited?

Active exploitation of CVE-2026-93395 has not been confirmed. Its EPSS score was 0.4% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-93395?

CVE-2026-93395 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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