vstakhov libucl ucl_parser.c ucl_parse_multiline_string heap-based overflow
Priority MEDIUM 55CWE-119Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00265 18th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD and the CNA
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2025-6499
- 2026-10-03 Alias added: GHSA-vprg-8xj9-vhmq
References
More vstakhov Libucl vulnerabilities
- TI-2026-00499 Libucl: libucl: denial of service via embedded null byte in ucl input CVSS 3.1HIGH 8.3
Sources
- CVE-2025-6499 · CVE Program
- CVE-2025-6499 · NVD
- FIRST EPSS
- GHSA-vprg-8xj9-vhmq · GitHub Advisory Database · CC BY 4.0
- CVE-2025-6499 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences