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CVE-2025-59043— OpenBao vulnerable to denial of service via malicious JSON request processing

Quick assessment

Affected
openbao openbao
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBao是OpenBao开源的一个敏感数据管理软件。 OpenBao 2.4.1之前版本存在资源管理错误漏洞，该漏洞源于JSON对象反序列化后可能占用过多内存，可能导致拒绝服务攻击。

CVSS 7.5 · High EPSS 0.69% · P51

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-59043

Vulnerability Information
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Vulnerability Title
OpenBao vulnerable to denial of service via malicious JSON request processing
Source: CVE Program / CVE List V5
Vulnerability Description
OpenBao is an open source identity-based secrets management system. In OpenBao versions prior to 2.4.1, JSON objects after decoding may use significantly more memory than their serialized version. It is possible to craft a JSON payload to maximize the factor between serialized memory usage and deserialized memory usage, similar to a zip bomb, with factors reaching approximately 35. This can be used to circumvent the max_request_size configuration parameter which is intended to protect against denial of service attacks. The request body is parsed into a map very early in the request handling chain before authentication, which means an unauthenticated attacker can send a specifically crafted JSON object and cause an out-of-memory crash. Additionally, for requests with large numbers of strings, the audit subsystem can consume large quantities of CPU. The vulnerability is fixed in version 2.4.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBao 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBao是OpenBao开源的一个敏感数据管理软件。 OpenBao 2.4.1之前版本存在资源管理错误漏洞，该漏洞源于JSON对象反序列化后可能占用过多内存，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.4.1 -

II. Public POCs for CVE-2025-59043

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6933 chars
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III. Intelligence Information for CVE-2025-59043

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Vendor Advisories for CVE-2025-59043 (1)

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-400

V. Comments for CVE-2025-59043

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