CVE-2026-18497

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-07. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.1
EG Score
7.1(high)
EG Risk
48(Track*)
EG Risk 48/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 7, 2026

Last Modified

August 12, 2026

Advisory Details (5)

Auto-updated Aug 12, 2026
No patch confirmed yet. Sources: cert.
generic

Heap buffer overflow in stbtt__GetGlyphShapeTT() - ASan verified · Issue #1905 · nothings/stb · GitHub

https://github.com/nothings/stb/issues/1905
cert

VU#987105 - The nothings stb TrueType library, up to version 1.26, contains a heap buffer overflow vulnerability

https://www.kb.cert.org/vuls/id/987105
cert

VU#987105 - The nothings stb TrueType library, up to version 1.26, contains a heap buffer overflow vulnerability

https://kb.cert.org/vuls/id/987105
generic

GitHub - nothings/stb: stb single-file public domain libraries for C/C++ · GitHub

https://github.com/nothings/stb
generic

CWE - CWE-122: Heap-based Buffer Overflow (4.20)

https://cwe.mitre.org/data/definitions/122.html

Vendor Advisories for CVE-2026-18497(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 27× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 21:49 UTCGHSA enrichment
  3. 2026-08-20 10:07 UTCGHSA enrichment
  4. 2026-08-19 22:25 UTCEG score recompute
  5. 2026-08-19 22:25 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 10:43 UTCGHSA enrichment
  8. 2026-08-18 22:57 UTCEG score recompute
  9. 2026-08-18 22:57 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 11:15 UTCGHSA enrichment
  12. 2026-08-17 23:28 UTCEG score recompute
  13. 2026-08-17 23:28 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 11:44 UTCGHSA enrichment
  16. 2026-08-16 23:55 UTCEG score recompute
  17. 2026-08-16 23:55 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 12:12 UTCEG score recompute
  20. 2026-08-16 12:12 UTCGHSA enrichment
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-16 00:30 UTCGHSA enrichment
  23. 2026-08-15 12:48 UTCEG score recompute
  24. 2026-08-15 12:48 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
Show 22 more
  1. 2026-08-15 01:05 UTCGHSA enrichment
  2. 2026-08-14 13:22 UTCGHSA enrichment
  3. 2026-08-14 01:40 UTCEG score recompute
  4. 2026-08-14 01:40 UTCGHSA enrichment
  5. 2026-08-13 22:00 UTCEPSS rescore
  6. 2026-08-13 13:57 UTCGHSA enrichment
  7. 2026-08-13 02:09 UTCEG score recompute
  8. 2026-08-13 02:09 UTCGHSA enrichment
  9. 2026-08-12 14:27 UTCGHSA enrichment
  10. 2026-08-12 13:59 UTCEG score recompute▲ 7.10
  11. 2026-08-12 13:59 UTCGHSA enrichment
  12. 2026-08-12 13:58 UTCMITRE cvelistV5CVSS v3 → 7.1 · severity → HIGH
  13. 2026-08-12 13:50 UTCEPSS rescore
  14. 2026-08-11 13:42 UTCEPSS rescore
  15. 2026-08-11 00:00 UTCEPSS rescore
  16. 2026-08-10 17:56 UTCEG score recompute
  17. 2026-08-10 17:56 UTCGHSA enrichment
  18. 2026-08-08 16:37 UTCEPSS rescore
  19. 2026-08-07 16:23 UTCGHSA enrichment
  20. 2026-08-07 16:22 UTCNVD update
  21. 2026-08-07 14:38 UTCEG score recompute
  22. 2026-08-07 14:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18497?
CVE-2026-18497 is a high vulnerability published on August 7, 2026. 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 stbttGetGlyphShapeTT() function within the nothings stb_truetype.h library when parsing malformed TTF (TrueType Font)…
When was CVE-2026-18497 disclosed?
CVE-2026-18497 was first published in the National Vulnerability Database on August 7, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18497 actively exploited?
CVE-2026-18497 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.4% of all scored CVEs.
What is the CVSS score of CVE-2026-18497?
CVE-2026-18497 has a CVSS v3.1 base score of 7.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-18497?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18497, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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