CVE-2025-6499
CVE-2025-6499 is a low-severity vulnerability in Vstakhov Libucl with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Low (CVSS 3.x base score 3.3)
- CVSS v2: 1.7
- CVSS v4: 1.9
- EPSS exploit prediction: 0% (12th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-28741
- Weakness: CWE-787
- Affected product: Vstakhov Libucl
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2025-6499?
- 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.
- How severe is CVE-2025-6499?
- CVE-2025-6499 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
- Is CVE-2025-6499 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-6499?
- CVE-2025-6499 affects Vstakhov Libucl. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-6499?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-6499 have an EU (EUVD) identifier?
- Yes. CVE-2025-6499 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-28741.
- When was CVE-2025-6499 published?
- CVE-2025-6499 was published on 2025-06-23 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:a:vstakhov:libucl:*:*:*:*:*:*:*:*
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