Heap-Based Buffer Overflow in Sparklemotion Nokogiri
CVE-2025-6494

4.8MEDIUM

Key Information:

Vendor

Sparklemotion

Status
Nokogiri
Vendor
CVE Published:
22 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6494?

A significant vulnerability exists in Sparklemotion's Nokogiri library, specifically affecting the function hashmap_get_with_hash located in the file gumbo-parser/src/hashmap.c. This flaw allows for a heap-based buffer overflow, which can be exploited through local means. Given that the exploit has been disclosed publicly, it represents a potential risk to affected systems, particularly those running Nokogiri versions up to 1.18.7. Users and administrators are urged to assess their installations for this vulnerability and take appropriate measures.

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Affected Version(s)

nokogiri c29c920907366cb74af13b4dc2230e9c9e23b833

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-6494 - Proof of Concept

References

https://vuldb.com/?id.313611
vdb-entrytechnical-description
https://vuldb.com/?ctiid.313611
signaturepermissions-required
https://vuldb.com/?submit.601006
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

JJLeo (VulDB User)
JSON
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