CVE-2026-18497

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM 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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.1Exploit: Elevated riskExposed services: Not assessed

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

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
7.1HIGHmedium confidence
EG Risk
48
EG Risk 48/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 7, 2026

Last Modified

September 8, 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.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libstb0.0~git20220908.8b5f1f3+ds-1 ... 0.0~git20250907.fede005+ds-1 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libstb0.0~git20241109.5c20573+ds-1, 0.0~git20250907.fede005+ds-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libstb0.0~git20241109.5c20573+ds-1, 0.0~git20250907.fede005+ds-1
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 89× 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.

Showing the most recent 100 of 187 total refreshes for this CVE.

  1. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 23:12 UTCGHSA enrichment
  3. 2026-10-04 05:44 UTCEG score recompute
  4. 2026-10-04 05:44 UTCGHSA enrichment
  5. 2026-10-03 14:25 UTCEPSS rescore
  6. 2026-10-03 01:01 UTCEG score recompute
  7. 2026-10-03 01:01 UTCGHSA enrichment
  8. 2026-10-02 09:33 UTCEG score recompute
  9. 2026-10-02 09:33 UTCGHSA enrichment
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 10:54 UTCGHSA enrichment
  12. 2026-09-30 22:56 UTCEG score recompute
  13. 2026-09-30 22:56 UTCGHSA enrichment
  14. 2026-09-30 15:02 UTCEPSS rescore
  15. 2026-09-29 15:20 UTCEPSS rescore
  16. 2026-09-29 05:46 UTCEG score recompute
  17. 2026-09-29 05:46 UTCGHSA enrichment
  18. 2026-09-28 13:51 UTCEPSS rescore
  19. 2026-09-28 04:58 UTCGHSA enrichment
  20. 2026-09-27 17:10 UTCEG score recompute
  21. 2026-09-27 17:10 UTCGHSA enrichment
  22. 2026-09-27 13:47 UTCEPSS rescore
  23. 2026-09-26 15:58 UTCEPSS rescore
  24. 2026-09-25 04:16 UTCEG score recompute
  25. 2026-09-25 04:16 UTCGHSA enrichment
Show 75 more
  1. 2026-09-24 11:58 UTCGHSA enrichment
  2. 2026-09-24 00:16 UTCEG score recompute
  3. 2026-09-24 00:16 UTCGHSA enrichment
  4. 2026-09-23 12:14 UTCGHSA enrichment
  5. 2026-09-23 00:31 UTCEG score recompute
  6. 2026-09-23 00:31 UTCGHSA enrichment
  7. 2026-09-22 12:49 UTCGHSA enrichment
  8. 2026-09-22 00:44 UTCEG score recompute
  9. 2026-09-22 00:44 UTCGHSA enrichment
  10. 2026-09-21 12:05 UTCGHSA enrichment
  11. 2026-09-20 20:33 UTCEG score recompute
  12. 2026-09-20 20:33 UTCGHSA enrichment
  13. 2026-09-20 03:05 UTCEG score recompute
  14. 2026-09-20 03:04 UTCGHSA enrichment
  15. 2026-09-19 14:51 UTCGHSA enrichment
  16. 2026-09-19 02:52 UTCEG score recompute
  17. 2026-09-19 02:52 UTCGHSA enrichment
  18. 2026-09-18 19:27 UTCEPSS rescore
  19. 2026-09-18 14:43 UTCGHSA enrichment
  20. 2026-09-18 02:54 UTCEG score recompute
  21. 2026-09-18 02:54 UTCGHSA enrichment
  22. 2026-09-17 15:11 UTCGHSA enrichment
  23. 2026-09-17 00:54 UTCEG score recompute
  24. 2026-09-17 00:54 UTCGHSA enrichment
  25. 2026-09-16 14:07 UTCEPSS rescore
  26. 2026-09-16 05:14 UTCEPSS rescore
  27. 2026-09-16 03:49 UTCGHSA enrichment
  28. 2026-09-15 16:06 UTCGHSA enrichment
  29. 2026-09-15 03:44 UTCEG score recompute
  30. 2026-09-15 03:44 UTCGHSA enrichment
  31. 2026-09-14 15:59 UTCGHSA enrichment
  32. 2026-09-14 04:16 UTCEG score recompute
  33. 2026-09-14 04:16 UTCGHSA enrichment
  34. 2026-09-13 16:46 UTCEPSS rescore
  35. 2026-09-13 16:34 UTCGHSA enrichment
  36. 2026-09-13 04:52 UTCGHSA enrichment
  37. 2026-09-12 17:09 UTCEG score recompute
  38. 2026-09-12 17:09 UTCGHSA enrichment
  39. 2026-09-12 15:00 UTCEPSS rescore
  40. 2026-09-12 05:27 UTCGHSA enrichment
  41. 2026-09-11 17:44 UTCEG score recompute
  42. 2026-09-11 17:44 UTCGHSA enrichment
  43. 2026-09-11 14:52 UTCEPSS rescore
  44. 2026-09-11 09:36 UTCEPSS rescore
  45. 2026-09-11 05:58 UTCGHSA enrichment
  46. 2026-09-10 18:16 UTCEG score recompute
  47. 2026-09-10 18:16 UTCGHSA enrichment
  48. 2026-09-10 09:34 UTCEPSS rescore
  49. 2026-09-10 06:30 UTCGHSA enrichment
  50. 2026-09-09 18:45 UTCGHSA enrichment
  51. 2026-09-09 06:00 UTCEG score recompute
  52. 2026-09-09 06:00 UTCGHSA enrichment
  53. 2026-09-08 22:00 UTCEPSS rescore
  54. 2026-09-08 16:12 UTCGHSA enrichment
  55. 2026-09-08 07:28 UTCGHSA enrichment
  56. 2026-09-07 17:45 UTCEG score recompute
  57. 2026-09-07 17:45 UTCGHSA enrichment
  58. 2026-09-07 16:01 UTCEPSS rescore
  59. 2026-09-06 15:36 UTCEG score recompute
  60. 2026-09-06 15:36 UTCGHSA enrichment
  61. 2026-09-06 13:47 UTCEPSS rescore
  62. 2026-09-06 03:53 UTCGHSA enrichment
  63. 2026-09-05 16:11 UTCEG score recompute
  64. 2026-09-05 16:11 UTCGHSA enrichment
  65. 2026-09-05 02:26 UTCEG score recompute
  66. 2026-09-05 02:26 UTCGHSA enrichment
  67. 2026-09-04 09:06 UTCEG score recompute
  68. 2026-09-04 09:06 UTCGHSA enrichment
  69. 2026-09-04 05:06 UTCEPSS rescore
  70. 2026-09-03 17:49 UTCGHSA enrichment
  71. 2026-09-03 06:02 UTCGHSA enrichment
  72. 2026-09-02 06:48 UTCGHSA enrichment
  73. 2026-09-01 17:39 UTCEG score recompute
  74. 2026-09-01 17:39 UTCGHSA enrichment
  75. 2026-09-01 13:53 UTCEPSS rescore

Related CVEs(same product + 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 on August 7, 2026, with the most recent update on September 8, 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 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-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?
No fix for CVE-2026-18497 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-18497 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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