CVE-2024-6381VulnerabilityPublished 2 Jul 2024Updated 3 Nov 2025

CVE-2024-6381: MongoDB libbson · Integer Overflow to Buffer Overflow

Affects MongoDB libbsonSource CVE Database V5

Not known to be exploited · CVSS 4.0 Medium : upgrade to 1.26.2 when convenient.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

4.0Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.26.2

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

Attack Vector: Local
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 2 Jul 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade MongoDB libbson to 1.26.2.

Affected software

Product	Affected	Fixed in
MongoDB Inc libbson	Affected =0 <1.26.2	Fixed in 1.26.2

AI-suggested

1. Immediately upgrade libbson to version 1.26.2 or later, which contains the fix for this vulnerability. 2. Audit all applications and services using the MongoDB C driver or libbson to identify usage of the bson_strfreev function or related string freeing operations. 3. Restrict local access to systems running vulnerable versions to trusted users only, minimizing the risk of local exploitation. 4. Implement memory safety and integrity monitoring tools to detect abnormal memory operations or crashes that could indicate exploitation attempts. 5. Incorporate static and dynamic code analysis in development pipelines to detect unsafe integer operations and buffer handling issues in custom code interfacing with libbson. 6. For containerized or virtualized environments, ensure base images are updated to include patched libbson versions. 7. Monitor vendor advisories and security bulletins for any emerging exploit code or additional patches related to this vulnerability. 8. Educate developers and system administrators about the risks of integer overflows leading to buffer overflows and encourage secure coding practices.

Description

The bson_strfreev function in the MongoDB C driver library may be susceptible to an integer overflow where the function will try to free memory at a negative offset. This may result in memory corruption. This issue affected libbson versions prior to 1.26.2

Impact

The primary impact of CVE-2024-6381 is memory corruption due to a buffer overflow triggered by an integer overflow in the libbson library. For European organizations, this can lead to application instability, crashes, or potential escalation to arbitrary code execution if exploited in a targeted manner. Although exploitation requires local access, this can be a concern in environments where untrusted users or processes have local system access, such as shared development machines, CI/CD pipelines, or containerized environments. The integrity of applications processing BSON data could be compromised, potentially affecting data processing workflows or embedded systems using MongoDB C drivers. While confidentiality and availability impacts are rated as none, integrity degradation can still disrupt business operations or lead to further compromise if chained with other vulnerabilities. European sectors with heavy reliance on MongoDB for data storage or embedded applications—such as finance, telecommunications, and manufacturing—may face operational risks if vulnerable versions are not updated. The absence of known exploits reduces immediate risk, but the vulnerability's presence in foundational libraries means that attackers could develop exploits in the future, especially in targeted attacks against high-value assets.

CWE-680Integer Overflow to Buffer Overflow (opens in a new tab)
Compound weakness
The product performs a calculation to determine how much memory to allocate, but an integer overflow can occur that causes less memory to be allocated than expected, leading to a buffer overflow.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V5.4.3 (opens in a new tab)
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
Attack patterns
Buffer Overflow via Environment Variables (opens in a new tab)
Overflow Buffers (opens in a new tab)
Client-side Injection-induced Buffer Overflow (opens in a new tab)
Filter Failure through Buffer Overflow (opens in a new tab)
Buffer Overflow via Symbolic Links (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Nov 2025, 20:06 UTC

WeaknessesCWE-680

Technical details

References

Community reviews

Related threats