High
libstb — security advisory
stb_vorbis through 1.22 contains a heap buffer overflow in start_decoder() where the codebook multiplicands allocation size is truncated from size_t to int. Attackers can craft a malicious Ogg Vorbis file with large entries and dimensions values to trigger out-of-bounds writes, causing process crashes or heap corruption.
- 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-2026-89266
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:31 UTC · Revision 1
Source evidence
stb_vorbis through 1.22 contains a heap buffer overflow in start_decoder() where the codebook multiplicands allocation size is truncated from size_t to int. Attackers can craft a malicious Ogg Vorbis file with large entries and dimensions values to trigger out-of-bounds writes, causing process crashes or heap corruption.
osv:UBUNTU-CVE-2026-89266
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": "9a20a032e7029e8965accf7f30e63011ee38359af79018f913b5d70f80890998",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-89266",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-89266",
"summary": "stb_vorbis through 1.22 contains a heap buffer overflow in start_decoder() where the codebook multiplicands allocation size is truncated from size_t to int. Attackers can craft a malicious Ogg Vorbis file with large entries and dimensions values to trigger out-of-bounds writes, causing process crashes or heap corruption.",
"evidence": "osv:UBUNTU-CVE-2026-89266",
"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",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20200713.b42009b+ds-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.0~git20210910.af1a5bc+ds-1",
"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": {
"value": "libstb",
"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-2026-89266",
"aliases": [
"UBUNTU-CVE-2026-89266"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N"
},
{
"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-2026-89266.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0",
"binary_version": "0.0~git20190817.1.052dce1-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89266.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0",
"binary_version": "0.0~git20210910.af1a5bc+ds-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libstb",
"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-2026-89266.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0t64",
"binary_version": "0.0~git20230129.5736b15+ds-1.2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"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-2026-89266.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0t64",
"binary_version": "0.0~git20250907.fede005+ds-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"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-2026-89266.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0t64",
"binary_version": "0.0~git20250907.fede005+ds-1"
}
]
}
}
],
"modified": "2026-10-17T13:01:16.575220295Z",
"provider": "osv",
"upstream": [
"CVE-2026-89266"
],
"references": [
"https://ubuntu.com/security/CVE-2026-89266",
"https://www.cve.org/CVERecord?id=CVE-2026-89266",
"https://github.com/nothings/stb/issues/1928",
"https://github.com/nothings/stb/issues/1933",
"https://github.com/nothings/stb/issues/1947",
"https://github.com/nothings/stb",
"https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L3878-L3880",
"https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L950",
"https://www.vulncheck.com/advisories/stb-vorbis-through-1.22-heap-buffer-overflow-via-codebook-multiplicands"
]
},
"related_cves": [
{
"value": "CVE-2026-89266",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 361459,
"published_at": "2026-09-12T00:17:00+00:00"
}