Low severity3.3NVD Advisory· Published Jun 23, 2025· Updated Apr 29, 2026

CVE-2025-6499

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
cpe:2.3:a:vstakhov:libucl:*:*:*:*:*:*:*:*
Range: <=0.9.2

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

github.com/vstakhov/libucl/issues/319nvdExploitIssue Tracking
vuldb.comnvdThird Party AdvisoryVDB Entry
vuldb.comnvdThird Party AdvisoryVDB Entry
vuldb.comnvdPermissions RequiredVDB Entry

News mentions

No linked articles in our index yet.

Severity

LowCVSS v3.1

3.3/ 10

CVSS v41.9

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack vector: Local
Complexity: Low
Privileges: Low
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

EPSS

Probability of exploitation in the next 30 days.

0.13%

VYPR risk score

Composite of severity, exploitation, and reach.

0.21low

cvss	0.214
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000

Weaknesses

CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-122
Heap-based Buffer Overflow
CWE-787
Out-of-bounds Write

CVE ID

CVE-2025-6499

Source code

github.com/user-attachments/files/19825399/libucl_crash.txt