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  4. CVE 2026 18497 the nothings stb truetype library contains a heap
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Back to active CVEs
High · CVSS 7.1CVE-2026-18497

The nothings stb TrueType library contains a heap buffer overflow vulnerabilityCVE-2026-18497

Answer in brief

CVE-2026-18497 records a High severity (CVSS 7.1) vulnerability in The nothings stb TrueType library contains a heap buffer overflow vulnerability. The current sources do not mark it as known exploited. The current feed maps Sean Barrett (nothings)/nothings stb (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 7, 2026Updated Oct 23, 2026Source checked Nov 5, 2026First seen by HOL Aug 7, 2026Material review Oct 23, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Sean Barrett (nothings)/nothings stb (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Sean Barrett (nothings)/nothings stbgeneric1.26Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Sean Barrett (nothings)/nothings stb.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Aug 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 7, 2026

Sources and claim methodology

  • Source referencecwe.mitre.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencekb.cert.org
  • Source referencekb.cert.org
Upstream source description

A heap-buffer-overflow vulnerability exists in the nothings stb TrueType library, up to version 1.26, that is used for parsing TrueType font files. The vulnerability exists in the stbtt__GetGlyphShapeTT() function within the nothings stb_truetype.h library when parsing malformed TTF (TrueType Font) files. The vulnerability resides in the glyph data parsing path. An attacker can craft a malformed TTF file with an inflated endPtsOfContours value and truncate the remaining glyph data. When an application utilizing stb_truetype.h (such as various game engines or graphics software) attempts to load, bake, or render this malformed font via stbtt_GetGlyphShape(), the parser will attempt to read past the end of the glyph data buffer, triggering the out-of-bounds read.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-122
Source
CVE List V5
Source checked
Nov 5, 2026
References
5 linked sources
Open source record