CVE-2025-0755: libbson Heap Overflow — Fix

Description

The various bson_append functions in the MongoDB C driver library may be susceptible to buffer overflow when performing operations that could result in a final BSON document which exceeds the maximum allowable size (INT32_MAX), resulting in a segmentation fault and possible application crash. This issue affected libbson versions prior to 1.27.5, MongoDB Server v8.0 versions prior to 8.0.1 and MongoDB Server v7.0 versions prior to 7.0.16

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CVSS v3.1 Score

8.4

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-122 CWE-122

Affected Products

Vendor	Product	Versions
mongodb	libbson	< 1.27.5
mongodb	mongodb	7.0.0 — 7.0.16
mongodb	mongodb	All

References

Advisories & Patches

https://jira.mongodb.org/browse/CDRIVER-5601 https://jira.mongodb.org/browse/SERVER-94461

Other References

https://lists.debian.org/debian-lts-announce/2025/05/msg00012.html https://lists.debian.org/debian-lts-announce/2025/05/msg00027.html

Frequently Asked Questions

What is CVE-2025-0755? +

The various bson_append functions in the MongoDB C driver library may be susceptible to buffer overflow when performing operations that could result in a final BSON document which exceeds the maximum allowable size (INT32_MAX), resulting in a segmentation fault and possible application crash. This issue affected libbson versions prior to 1.27.5, MongoDB Server v8.0 versions prior to 8.0.1 and MongoDB Server v7.0 versions prior to 7.0.16 It has a CVSS v3.1 base score of 8.4 (HIGH).

How severe is CVE-2025-0755? +

CVE-2025-0755 has a CVSS v3.1 score of 8.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-0755? +

CVE-2025-0755 affects products from mongodb, specifically: libbson, mongodb. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-0755? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-0755