libstb — security advisory
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.
- Products
- libstb
- Affected versions
- 0.0~git20190817.1.052dce1-1, 0.0~git20200713.b42009b+ds-1, 0.0~git20210910.af1a5bc+ds-1, 0.0~git20230129.5736b15+ds-1, 0.0~git20230129.5736b15+ds-1.1, 0.0~git20230129.5736b15+ds-1.2, 0.0~git20241109.5c20573+ds-1, 0.0~git20250907.fede005+ds-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-18497
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:55 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-18497
libstb
Fixed versions: Not specified
libstb
Fixed versions: Not specified
libstb
Fixed versions: Not specified
libstb
Fixed versions: Not specified
libstb
Fixed versions: Not specified
Complete source record
{
"id": "0447b95924faee194d6d9ea16e37f4c6f6e8b3829fb6e565898c75edf2f118e1",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18497",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-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:UBUNTU-CVE-2026-18497",
"products": [
{
"name": {
"value": "libstb",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20190817.1.052dce1-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libstb",
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},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20200713.b42009b+ds-1",
"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libstb",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20230129.5736b15+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.0~git20230129.5736b15+ds-1.1",
"evidence": "/affected/2/versions"
},
{
"value": "0.0~git20230129.5736b15+ds-1.2",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20250907.fede005+ds-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "libstb",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20241109.5c20573+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "0.0~git20250907.fede005+ds-1",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-18497",
"aliases": [
"UBUNTU-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"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libstb",
"purl": "pkg:deb/ubuntu/libstb?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"0.0~git20190817.1.052dce1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18497.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0",
"binary_version": "0.0~git20190817.1.052dce1-1"
}
]
}
},
{
"ranges": [
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"events": [
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],
"package": {
"name": "libstb",
"purl": "pkg:deb/ubuntu/libstb?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.0~git20200713.b42009b+ds-1",
"0.0~git20210910.af1a5bc+ds-1"
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"database_specific": {
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},
"ecosystem_specific": {
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}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/libstb?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.0~git20230129.5736b15+ds-1",
"0.0~git20230129.5736b15+ds-1.1",
"0.0~git20230129.5736b15+ds-1.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18497.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0t64",
"binary_version": "0.0~git20230129.5736b15+ds-1.2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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],
"package": {
"name": "libstb",
"purl": "pkg:deb/ubuntu/libstb?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"0.0~git20250907.fede005+ds-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18497.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0t64",
"binary_version": "0.0~git20250907.fede005+ds-1"
}
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}
},
{
"ranges": [
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],
"package": {
"name": "libstb",
"purl": "pkg:deb/ubuntu/libstb?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"0.0~git20241109.5c20573+ds-1",
"0.0~git20250907.fede005+ds-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18497.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0t64",
"binary_version": "0.0~git20250907.fede005+ds-1"
}
]
}
}
],
"modified": "2026-10-17T12:59:53.620497233Z",
"provider": "osv",
"upstream": [
"CVE-2026-18497"
],
"references": [
"https://ubuntu.com/security/CVE-2026-18497",
"https://www.cve.org/CVERecord?id=CVE-2026-18497",
"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"
]
},
"related_cves": [
{
"value": "CVE-2026-18497",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359882,
"published_at": "2026-08-07T15:16:00+00:00"
}