Out-of-Bounds Read Vulnerability in Nothings stb TTF File Handler
CVE-2026-5314

5.3MEDIUM

Key Information:

Vendor

Nothings

Status
Stb
Vendor
CVE Published:
1 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5314?

A security weakness exists in the Nothings stb library, specifically in the stbtt_InitFont_internal function of the TTF File Handler component up to version 1.26. This vulnerability allows for out-of-bounds read conditions, which can potentially be exploited by remote attackers. The issue has been publicly disclosed, raising concern for users of the affected library. Despite early notification to the vendor, there has been no response or public acknowledgment regarding this critical issue.

Affected Version(s)

stb 1.0

stb 1.1

stb 1.2

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-2026-5314 - Proof of Concept

References

https://vuldb.com/vuln/354646
vdb-entrytechnical-description
https://vuldb.com/vuln/354646/cti
signaturepermissions-required
https://vuldb.com/submit/780558
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

d0razi (VulDB User)
VulDB
.