CVE-2025-15534Public exploit

Application crash via negative glyph-width allocation

Published Jan 18, 2026 · Updated Jan 18, 2026

Integer overflow in raylib 909f040 allows local users to crash applications that process a crafted font through LoadFontData. LoadFontData accepts a negative glyph advance width from font data and multiplies it by the font size for RL_CALLOC; the invalid allocation then reaches GenImageFontAtlas. Reachability requires a local user to make a raylib-based program load the malicious font, and the demonstrated consequence is a segmentation-fault service interrupt.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in raylib 909f040 allows local users to crash applications that process a crafted font through LoadFontData. LoadFontData accepts a negative glyph advance width from font data and multiplies it by the font size for RL_CALLOC; the invalid allocation then reaches GenImageFontAtlas. Reachability requires a local user to make a raylib-based program load the malicious font, and the demonstrated consequence is a segmentation-fault service interrupt.

The record

CVE
CVE-2025-15534
Published
Jan 18, 2026
Updated
Jan 18, 2026
Vendor
raysan5
Product
raylib
Classifications
CWE-189, CWE-190
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=909f040

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

raysan5 · raylibversion=909f040

Published CVSS scores

5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-189Numeric Errors
CWE-190Integer Overflow or Wraparound

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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