CVE-2026-13077

Out-of-Bounds Heap Read in BSON CodeWScope Element Parsing via Malformed BSONColumn Data

State: Published
Severity: 7.1 High
Published: Jul 22, 2026
Updated: Jul 23, 2026
Reserved: Jun 23, 2026

Description

A missing bounds check in the BSON CodeWScope element accessors allows an attacker to trigger an out-of-bounds heap read via a crafted aggregation pipeline. The vulnerability can be exploited by an authenticated user by generating a malformed BSONColumn data containing a CodeWScope element, bypassing wire-level BSON validation. When the forged element is decompressed, the unchecked size value is used in pointer arithmetic, causing either a server crash or disclosure of adjacent heap memory contents.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N	mongodb
3.1	7.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H	mongodb

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
MongoDB ServerMongoDB	7.0 to before 7.0.39Affected 8.0 to before 8.0.28Affected 8.2.0 to before 8.2.12Affected 8.3.0 to before 8.3.7Affected

References

https://jira.mongodb.org/browse/SERVER-129103

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