Stack-Based Buffer Overflow in Happyfish100's Libfastcommon
CVE-2026-2016

4.8MEDIUM

Key Information:

Vendor

Happyfish100

Status
Libfastcommon
Vendor
CVE Published:
6 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2016?

A security flaw in Happyfish100's libfastcommon affects the base64_decode function located in src/base64.c. This vulnerability allows for a stack-based buffer overflow, requiring local access for exploitation. Given that this issue has been publicly disclosed, it is crucial to apply the recommended patch (commit identifier 82f66af3e252e3e137dba0c3891570f085e79adf) to mitigate the risk.

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Deploy the Patch

Affected Version(s)

libfastcommon 1.0.0

libfastcommon 1.0.1

libfastcommon 1.0.2

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-2026-2016 - Proof of Concept

References

https://vuldb.com/?id.344598
vdb-entrytechnical-description
https://vuldb.com/?ctiid.344598
signaturepermissions-required
https://vuldb.com/?submit.743873
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
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

liloler (VulDB User)
JSON
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