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CVE-2025-6499— vstakhov libucl ucl_parser.c ucl_parse_multiline_string heap-based overflow

Quick assessment

Affected
vstakhov libucl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libucl是Vsevolod Stakhov个人开发者的一个C语言通用配置库解析器。 libucl 0.9.2及之前版本存在安全漏洞，该漏洞源于src/ucl_parser.c文件中ucl_parse_multiline_string函数存在堆缓冲区溢出。

CVSS 3.3 · Low EPSS 0.23% · P14
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I. Basic Information for CVE-2025-6499

Vulnerability Information
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Vulnerability Title
vstakhov libucl ucl_parser.c ucl_parse_multiline_string heap-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability classified as problematic was found in vstakhov libucl up to 0.9.2. Affected by this vulnerability is the function ucl_parse_multiline_string of the file src/ucl_parser.c. The manipulation leads to heap-based buffer overflow. The attack needs to be approached locally. The exploit has been disclosed to the public and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
libucl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libucl是Vsevolod Stakhov个人开发者的一个C语言通用配置库解析器。 libucl 0.9.2及之前版本存在安全漏洞，该漏洞源于src/ucl_parser.c文件中ucl_parse_multiline_string函数存在堆缓冲区溢出。
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
vstakhov libucl 0.9.0 -

II. Public POCs for CVE-2025-6499

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III. Intelligence Information for CVE-2025-6499

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Other References for CVE-2025-6499 (1)

IV. Related Vulnerabilities

Same product: libucl
Same vendor: vstakhov
Same weakness: CWE-122

V. Comments for CVE-2025-6499

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