What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-06-23 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• vstakhov libucl: through 0.9.2

References

• https://github.com/user-attachments/files/19825399/libucl_crash.txt
• https://github.com/vstakhov/libucl/issues/319
• https://vuldb.com/?ctiid.313615
• https://vuldb.com/?id.313615
• https://vuldb.com/?submit.601011
• https://github.com/vstakhov/libucl/issues/319

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