vstakhov libucl up to 0.9.2 src/ucl_parser.c ucl_parse_multiline_string heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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3.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in vstakhov libucl up to 0.9.2. Impacted is the function ucl_parse_multiline_string of the file src/ucl_parser.c. This manipulation causes heap-based overflow. This vulnerability is registered as CVE-2025-6499. The attack needs to be launched locally. Furthermore, an exploit is available.

Detailsinfo

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 with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect availability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-6499. The exploitation appears to be easy. Attacking locally is a requirement. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.1

VulDB Base Score: 3.3
VulDB Temp Score: 3.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 3.3
CNA Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/22/2025 🔍
06/22/2025 +0 days 🔍
06/23/2025 +1 days 🔍

Sourcesinfo

Product: github.com

Advisory: 319
Status: Not defined

CVE: CVE-2025-6499 (🔍)
GCVE (CVE): GCVE-0-2025-6499
GCVE (VulDB): GCVE-100-313615
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/22/2025 21:11
Updated: 06/23/2025 05:23
Changes: 06/22/2025 21:11 (56), 06/23/2025 05:23 (30)
Complete: 🔍
Submitter: JJLeo
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #601011: vstakhov libucl libucl 0.9.2 (commit 3e7f023) Heap-based Buffer Overflow (by JJLeo)

Be aware that VulDB is the high quality source for vulnerability data.

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