libstb — security advisory
stb_image is a single file MIT licensed library for processing images. It may look like `stbi__load_gif_main` doesn’t give guarantees about the content of output value `*delays` upon failure. Although it sets `*delays` to zero at the beginning, it doesn’t do it in case the image is not recognized as GIF and a call to `stbi__load_gif_main_outofmem` only frees possibly allocated memory in `*delays` without resetting it to zero. Thus it would be fair to say the caller of `stbi__load_gif_main` is responsible to free the allocated memory in `*delays` only if `stbi__load_gif_main` returns a non null value. However at the same time the function may return null value, but fail to free the memory in `*delays` if internally `stbi__convert_format` is called and fails. Thus the issue may lead to a memory leak if the caller chooses to free `delays` only when `stbi__load_gif_main` didn’t fail or to a double-free if the `delays` is always freed
- 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~git20240715.f7f20f39fe4f+ds-1, 0.0~git20241109.5c20573+ds-1, 0.0~git20250907.fede005+ds-1
- Fixed versions
- Not specified
- CVEs
- CVE-2023-45666
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:43 UTC · Revision 1
Source evidence
stb_image is a single file MIT licensed library for processing images. It may look like `stbi__load_gif_main` doesn’t give guarantees about the content of output value `*delays` upon failure. Although it sets `*delays` to zero at the beginning, it doesn’t do it in case the image is not recognized as GIF and a call to `stbi__load_gif_main_outofmem` only frees possibly allocated memory in `*delays` without resetting it to zero. Thus it would be fair to say the caller of `stbi__load_gif_main` is responsible to free the allocated memory in `*delays` only if `stbi__load_gif_main` returns a non null value. However at the same time the function may return null value, but fail to free the memory in `*delays` if internally `stbi__convert_format` is called and fails. Thus the issue may lead to a memory leak if the caller chooses to free `delays` only when `stbi__load_gif_main` didn’t fail or to a double-free if the `delays` is always freed
osv:UBUNTU-CVE-2023-45666
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
libstb
Fixed versions: Not specified
Complete source record
{
"id": "cbb3d6425c684b46084474f3bbf4577b9768f4ac5e691e88a65f9a7d39ef8775",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2023-45666",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2023-45666",
"summary": "stb_image is a single file MIT licensed library for processing images. It may look like `stbi__load_gif_main` doesn’t give guarantees about the content of output value `*delays` upon failure. Although it sets `*delays` to zero at the beginning, it doesn’t do it in case the image is not recognized as GIF and a call to `stbi__load_gif_main_outofmem` only frees possibly allocated memory in `*delays` without resetting it to zero. Thus it would be fair to say the caller of `stbi__load_gif_main` is responsible to free the allocated memory in `*delays` only if `stbi__load_gif_main` returns a non null value. However at the same time the function may return null value, but fail to free the memory in `*delays` if internally `stbi__convert_format` is called and fails. Thus the issue may lead to a memory leak if the caller chooses to free `delays` only when `stbi__load_gif_main` didn’t fail or to a double-free if the `delays` is always freed",
"evidence": "osv:UBUNTU-CVE-2023-45666",
"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"
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{
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"evidence": "/affected/1/versions"
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{
"name": {
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
"name": {
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"evidence": "/affected/3/package/name"
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"affected_versions": [
{
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"evidence": "/affected/3/versions"
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{
"value": "0.0~git20241109.5c20573+ds-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "libstb",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "0.0~git20250907.fede005+ds-1",
"evidence": "/affected/4/versions"
}
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},
{
"name": {
"value": "libstb",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "0.0~git20241109.5c20573+ds-1",
"evidence": "/affected/5/versions"
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{
"value": "0.0~git20250907.fede005+ds-1",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2023-45666",
"aliases": [
"UBUNTU-CVE-2023-45666"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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/2023/UBUNTU-CVE-2023-45666.json"
},
"ecosystem_specific": {
"binaries": [
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{
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"package": {
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"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/2023/UBUNTU-CVE-2023-45666.json"
},
"ecosystem_specific": {
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{
"binary_name": "libstb0",
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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": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0t64",
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{
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"package": {
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"ecosystem": "Ubuntu:25.10"
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"versions": [
"0.0~git20240715.f7f20f39fe4f+ds-1",
"0.0~git20241109.5c20573+ds-1"
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"ecosystem": "Ubuntu:26.10"
},
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"0.0~git20250907.fede005+ds-1"
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{
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"package": {
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"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/2023/UBUNTU-CVE-2023-45666.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libstb0t64",
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}
]
}
}
],
"modified": "2026-10-17T12:57:21.490657998Z",
"provider": "osv",
"upstream": [
"CVE-2023-45666"
],
"references": [
"https://ubuntu.com/security/CVE-2023-45666",
"https://securitylab.github.com/advisories/GHSL-2023-145_GHSL-2023-151_stb_image_h/",
"https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_image.h#L6962-L7045",
"https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_image.h#L6957",
"https://www.cve.org/CVERecord?id=CVE-2023-45666"
]
},
"related_cves": [
{
"value": "CVE-2023-45666",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 357303,
"published_at": "2023-10-21T00:15:00+00:00"
}