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Fencer Vulns
medium 5.3

CVE-2023-0437 json

MongoDB client C Driver may infinitely loop when validating certain BSON input data

published 2024-01-12 2 y ago modified 2026-07-25 3 mo ago also EUVD-2023-12492 , JLSEC-2026-179

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits
0
none known

Summary

When calling bson_utf8_validate on some inputs a loop with an exit condition that cannot be reached may occur, i.e. an infinite loop. This issue affects All MongoDB C Driver versions prior to versions 1.25.0.

Patch / fix

  • julia MongoC_jll 1.25.1+0
  • MongoDB Inc MongoDB C Driver 1.25.0
  • mongodb c_driver 1.25.0
  • mongo-c-driver Debian 12 1.23.1-1+deb12u1
  • mongo-c-driver Debian 14, Debian 13 1.25.0-1
  • libbson-xs-perl Debian 12 0.8.4-2+deb12u1

debian advisories DEBIAN-CVE-2023-0437

  • mongo-c-driver Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 1.25.4-r0

alpine advisories ALPINE-CVE-2023-0437

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-0437 updated cvss 5.3

mongo-c-driver: bson_utf8_validate on some inputs leads to an infinite loop

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.10% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia MongoC_jll
<1.25.1+0
1.25.1+0

Affected products

  • MongoDB Inc MongoDB C Driver
  • mongodb c_driver

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.