libstb — security advisory

{
  "id": "d632730f5948067791c73859bb406c14a7b4029cbad335b0893eccfd22323f77",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-18497",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-18497",
    "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.",
    "evidence": "osv:DEBIAN-CVE-2026-18497",
    "products": [
      {
        "name": {
          "value": "libstb",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.0~git20220908.8b5f1f3+ds-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.0~git20230129.5736b15+ds-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.0~git20230129.5736b15+ds-1.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.0~git20230129.5736b15+ds-1.1~exp1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.0~git20230129.5736b15+ds-1.2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.0~git20240715.f7f20f39fe4f+ds-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.0~git20241109.5c20573+ds-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.0~git20250907.fede005+ds-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "libstb",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.0~git20241109.5c20573+ds-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0.0~git20250907.fede005+ds-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "libstb",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.0~git20241109.5c20573+ds-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "0.0~git20250907.fede005+ds-1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-18497",
      "aliases": [
        "DEBIAN-CVE-2026-18497"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libstb",
            "purl": "pkg:deb/debian/libstb?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "0.0~git20220908.8b5f1f3+ds-1",
            "0.0~git20230129.5736b15+ds-1",
            "0.0~git20230129.5736b15+ds-1.1",
            "0.0~git20230129.5736b15+ds-1.1~exp1",
            "0.0~git20230129.5736b15+ds-1.2",
            "0.0~git20240715.f7f20f39fe4f+ds-1",
            "0.0~git20241109.5c20573+ds-1",
            "0.0~git20250907.fede005+ds-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18497.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libstb",
            "purl": "pkg:deb/debian/libstb?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "0.0~git20241109.5c20573+ds-1",
            "0.0~git20250907.fede005+ds-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18497.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libstb",
            "purl": "pkg:deb/debian/libstb?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "0.0~git20241109.5c20573+ds-1",
            "0.0~git20250907.fede005+ds-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18497.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        }
      ],
      "modified": "2026-10-24T09:47:37.636962396Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-18497"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-18497"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-18497",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429056,
  "published_at": "2026-08-07T15:16:59.707+00:00"
}