Is there a public PoC exploit available for CVE-2026-5314?

Yes, a public proof-of-concept exploit is available for CVE-2026-5314. Prioritise patching immediately. EPSS: 0.0%.

Stb CVE-2026-5314

Q: What is the CVSS score of CVE-2026-5314?

CVE-2026-5314 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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. EPSS exploitation probability: 0.0%.

EUVD-2026-18092 LOW

Out-of-bounds Read (CWE-125)

2026-04-01 VulDB

GHSA-x46x-p265-r7jv

Information Disclosure Buffer Overflow Stb

2.1

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

2.1 LOW

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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

Red Hat

6.5 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

5.3 (MEDIUM) 2.1 (LOW)

PoC Detected

Apr 03, 2026 - 16:10 vuln.today

Public exploit code

EUVD ID Assigned

Apr 01, 2026 - 23:16 euvd

EUVD-2026-18092

Analysis Generated

Apr 01, 2026 - 23:16 vuln.today

CVE Published

Apr 01, 2026 - 22:15 nvd

MEDIUM 5.3

DescriptionCVE.org

A vulnerability was found in Nothings stb up to 1.26. Impacted is the function stbtt_InitFont_internal in the library stb_truetype.h of the component TTF File Handler. Performing a manipulation results in out-of-bounds read. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Out-of-bounds read in Nothings stb library up to version 1.26 allows remote attackers to trigger information disclosure via a crafted TTF file processed by the stbtt_InitFont_internal function in stb_truetype.h. Exploitation requires user interaction (opening a malicious font file) and publicly available exploit code exists; however, the vendor has not responded to early disclosure notification.

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Vulnerability AssessmentAI

Risk Assessment	The CVSS v4.0 score of 5.3 reflects a moderate threat profile with several mitigating factors. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A user receives a malicious TTF font file via email or downloads it from an untrusted font repository. When the user opens an application that uses stb_truetype.h to render or inspect the font (such as a font manager, graphics editor, or game with custom font loading), the stbtt_InitFont_internal function parses the crafted file's header without proper bounds validation. …
Remediation	No vendor-released patch has been made available as the developer did not respond to early disclosure efforts. … Detailed patch versions, workarounds, and compensating controls in full report.

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Vendor StatusVendor

CVE-2026-5314 vulnerability details – vuln.today

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