CVE-2025-0755

Application crash via cumulative BSON length overflow

Published Mar 18, 2025 · Updated Nov 3, 2025

Heap-based buffer overflow in MongoDB libbson before 1.27.5 allows local users to crash applications through oversized BSON documents. The _bson_append_va routine copied multiple values without safely tracking their cumulative byte count, permitting writes beyond the intended heap buffer. Reaching the fault requires an affected append function to build a document larger than INT32_MAX; the reported result is a segmentation fault and application crash, including in Server 7.0 before 7.0.16 and 8.0 before 8.0.1.

CVSS severity8.4
High
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in MongoDB libbson before 1.27.5 allows local users to crash applications through oversized BSON documents. The _bson_append_va routine copied multiple values without safely tracking their cumulative byte count, permitting writes beyond the intended heap buffer. Reaching the fault requires an affected append function to build a document larger than INT32_MAX; the reported result is a segmentation fault and application crash, including in Server 7.0 before 7.0.16 and 8.0 before 8.0.1.

The record

CVE
CVE-2025-0755
Published
Mar 18, 2025
Updated
Nov 3, 2025
Vendor
MongoDB
Product
libbson
Classifications
CWE-122, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.27.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

MongoDB · libbsonversion=0 <1.27.5
MongoDB · MongoDB Serverversion=7.0 <7.0.16; version=8.0 <8.0.1

Published CVSS scores

8.4MongoDBCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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