Vulnerability-Lookup

CVE-2026-18497 (GCVE-0-2026-18497)

Vulnerability from cvelistv5 – Published: 2026-08-07 14:19 – Updated: 2026-08-12 13:51

Title

The nothings stb TrueType library contains a heap buffer overflow vulnerability

Summary

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.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-07 17:58 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

certcc mitre root

References

5 references

URL	Tags
https://cwe.mitre.org/data/definitions/122.html
https://github.com/nothings/stb
https://github.com/nothings/stb/issues/1905
https://kb.cert.org/vuls/id/987105
https://www.kb.cert.org/vuls/id/987105

Impacted products

1 product

Vendor	Product	Version	CPE status
Sean Barrett (nothings)	nothings stb	Affected: 1.26	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-18497

Vulnerability from fkie_nvd - Published: 2026-08-07 15:16 - Updated: 2026-08-12 14:17

Severity

7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Summary

References

	URL	Tags
	cret@cert.org	https://cwe.mitre.org/data/definitions/122.html
	cret@cert.org	https://github.com/nothings/stb
	cret@cert.org	https://github.com/nothings/stb/issues/1905
	cret@cert.org	https://kb.cert.org/vuls/id/987105
	af854a3a-2127-422b-91ae-364da2661108	https://www.kb.cert.org/vuls/id/987105
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/nothings/stb/issues/1905

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "nothings stb",
          "vendor": "Sean Barrett (nothings)",
          "versions": [
            {
              "status": "affected",
              "version": "1.26"
            }
          ]
        }
      ],
      "source": "cret@cert.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
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    }
  ],
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  "lastModified": "2026-08-12T14:17:48.027",
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GHSA-FHQP-XWQM-2M94

Vulnerability from github – Published: 2026-08-07 15:33 – Updated: 2026-08-12 15:30

Details

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.

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-18497"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-122"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-07T15:16:59Z",
    "severity": "HIGH"
  },
  "details": "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.\n\nAn 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.",
  "id": "GHSA-fhqp-xwqm-2m94",
  "modified": "2026-08-12T15:30:29Z",
  "published": "2026-08-07T15:33:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18497"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nothings/stb/issues/1905"
    },
    {
      "type": "WEB",
      "url": "https://cwe.mitre.org/data/definitions/122.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nothings/stb"
    },
    {
      "type": "WEB",
      "url": "https://kb.cert.org/vuls/id/987105"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/987105"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

ubuntu-cve-2026-18497

Vulnerability from osv_ubuntu

Published

2026-08-07 15:16

Modified

2026-08-13 17:17

Summary

Details

Severity

7.1 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-18497	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-18497	REPORT
	https://cwe.mitre.org/data/definitions/122.html	REPORT
	https://github.com/nothings/stb	REPORT
	https://github.com/nothings/stb/issues/1905	REPORT
	https://kb.cert.org/vuls/id/987105	REPORT
	https://www.kb.cert.org/vuls/id/987105	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstb0",
            "binary_version": "0.0~git20190817.1.052dce1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libstb",
        "purl": "pkg:deb/ubuntu/libstb@0.0~git20190817.1.052dce1-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20190817.1.052dce1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstb0",
            "binary_version": "0.0~git20210910.af1a5bc+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libstb",
        "purl": "pkg:deb/ubuntu/libstb@0.0~git20210910.af1a5bc+ds-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20200713.b42009b+ds-1",
        "0.0~git20210910.af1a5bc+ds-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstb0t64",
            "binary_version": "0.0~git20230129.5736b15+ds-1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libstb",
        "purl": "pkg:deb/ubuntu/libstb@0.0~git20230129.5736b15+ds-1.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20230129.5736b15+ds-1",
        "0.0~git20230129.5736b15+ds-1.1",
        "0.0~git20230129.5736b15+ds-1.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstb0t64",
            "binary_version": "0.0~git20250907.fede005+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libstb",
        "purl": "pkg:deb/ubuntu/libstb@0.0~git20250907.fede005+ds-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20241109.5c20573+ds-1",
        "0.0~git20250907.fede005+ds-1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-18497",
  "modified": "2026-08-13T17:17:06Z",
  "published": "2026-08-07T15:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-18497"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-18497"
    },
    {
      "type": "REPORT",
      "url": "https://cwe.mitre.org/data/definitions/122.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nothings/stb"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nothings/stb/issues/1905"
    },
    {
      "type": "REPORT",
      "url": "https://kb.cert.org/vuls/id/987105"
    },
    {
      "type": "REPORT",
      "url": "https://www.kb.cert.org/vuls/id/987105"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-18497"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-18497 (GCVE-0-2026-18497)

FKIE_CVE-2026-18497

GHSA-FHQP-XWQM-2M94

ubuntu-cve-2026-18497

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature