Vulnerability · Published Jun 23, 2025 · Assigned by VulDB
CVE-2025-6499vstakhov libucl ucl_parser.c ucl_parse_multiline_string heap-based overflow
Low 3.3
In plain English
A low-severity heap buffer overflow in libucl from vstakhov. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).
Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.3%top 81.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 (as reported)
Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
References
- VDB-313615 | vstakhov libucl ucl_parser.c ucl_parse_multiline_string heap-based overflow vdb-entry, technical-description
- VDB-313615 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #601011 | vstakhov libucl libucl 0.9.2 (commit 3e7f023) Heap-based Buffer Overflow third-party-advisory
- https://github.com/vstakhov/libucl/issues/319 issue-tracking
- https://github.com/user-attachments/files/19825399/libucl_crash.txt exploit