HighFix available
libpng, libpng1.6 — security advisory
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user's display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification. This vulnerability is fixed in 1.6.55.
- Products
- libpng, libpng1.6
- Affected versions
- 1.2.49-4ubuntu1, 1.2.49-5ubuntu1, 1.2.50-1ubuntu1, 1.2.50-1ubuntu2, 1.2.50-1ubuntu2.14.04.1, 1.2.50-1ubuntu2.14.04.2, 1.2.50-1ubuntu2.14.04.3, 1.2.51-0ubuntu3, 1.2.54-1, 1.2.54-1ubuntu1, 1.2.54-1ubuntu1.1, 1.2.54-1ubuntu1.1+esm1, 1.6.20-2, 1.6.20-2ubuntu0.1~esm1, 1.6.20-2ubuntu0.1~esm2, 1.6.34-1, 1.6.34-1ubuntu0.18.04.1, 1.6.34-1ubuntu0.18.04.2, 1.6.34-1ubuntu0.18.04.2+esm1, 1.6.37-1, 1.6.37-2, 1.6.37-2ubuntu0.1~esm1, 1.6.37-3build4, 1.6.37-3build5, 1.6.37-3ubuntu0.1, 1.6.37-3ubuntu0.3, 1.6.40-1, 1.6.40-2, 1.6.40-3, 1.6.42-1, 1.6.43-1, 1.6.43-3, 1.6.43-5build1, 1.6.43-5ubuntu0.1, 1.6.43-5ubuntu0.3, 1.6.43-5ubuntu0.4, 1.6.47-1.1, 1.6.48-1, 1.6.49-1~exp1, 1.6.50-1, 1.6.50-1ubuntu0.1, 1.6.50-1ubuntu0.3, 1.6.50-1~exp1, 1.6.51-1, 1.6.53-1, 1.6.54-1
- Fixed versions
- 1.2.50-1ubuntu2.14.04.3+esm1, 1.2.54-1ubuntu1.1+esm2, 1.6.20-2ubuntu0.1~esm3, 1.6.34-1ubuntu0.18.04.2+esm2, 1.6.37-2ubuntu0.1~esm2, 1.6.37-3ubuntu0.4, 1.6.43-5ubuntu0.5, 1.6.50-1ubuntu0.4, 1.6.55-1
- CVEs
- CVE-2026-25646
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:18 UTC · Revision 1
Source evidence
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user's display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification. This vulnerability is fixed in 1.6.55.
osv:UBUNTU-CVE-2026-25646
libpng
Fixed versions: 1.2.50-1ubuntu2.14.04.3+esm1
libpng
Fixed versions: 1.2.54-1ubuntu1.1+esm2
libpng1.6
Fixed versions: 1.6.20-2ubuntu0.1~esm3
libpng1.6
Fixed versions: 1.6.34-1ubuntu0.18.04.2+esm2
libpng1.6
Fixed versions: 1.6.37-2ubuntu0.1~esm2
libpng1.6
Fixed versions: 1.6.37-3ubuntu0.4
libpng1.6
Fixed versions: 1.6.43-5ubuntu0.5
libpng1.6
Fixed versions: 1.6.50-1ubuntu0.4
libpng1.6
Fixed versions: 1.6.55-1
Complete source record
{
"id": "7c3385c70a6d46aba6453118c98eb53652b97de451061df488b217a9fbfdcca7",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-25646",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-25646",
"summary": "LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user's display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification. This vulnerability is fixed in 1.6.55.",
"evidence": "osv:UBUNTU-CVE-2026-25646",
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"affected_versions": [
{
"value": "1.6.34-1",
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{
"value": "1.6.34-1ubuntu0.18.04.1",
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{
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{
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{
"name": {
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"fixed_versions": [
{
"value": "1.6.37-2ubuntu0.1~esm2",
"evidence": "/affected/4/ranges"
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],
"affected_versions": [
{
"value": "1.6.37-1",
"evidence": "/affected/4/versions"
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{
"value": "1.6.37-2",
"evidence": "/affected/4/versions"
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{
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{
"name": {
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{
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],
"affected_versions": [
{
"value": "1.6.37-3build4",
"evidence": "/affected/5/versions"
},
{
"value": "1.6.37-3build5",
"evidence": "/affected/5/versions"
},
{
"value": "1.6.37-3ubuntu0.1",
"evidence": "/affected/5/versions"
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{
"value": "1.6.37-3ubuntu0.3",
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{
"name": {
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"evidence": "/affected/6/package/name"
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"fixed_versions": [
{
"value": "1.6.43-5ubuntu0.5",
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"affected_versions": [
{
"value": "1.6.40-1",
"evidence": "/affected/6/versions"
},
{
"value": "1.6.40-2",
"evidence": "/affected/6/versions"
},
{
"value": "1.6.40-3",
"evidence": "/affected/6/versions"
},
{
"value": "1.6.42-1",
"evidence": "/affected/6/versions"
},
{
"value": "1.6.43-1",
"evidence": "/affected/6/versions"
},
{
"value": "1.6.43-3",
"evidence": "/affected/6/versions"
},
{
"value": "1.6.43-5build1",
"evidence": "/affected/6/versions"
},
{
"value": "1.6.43-5ubuntu0.1",
"evidence": "/affected/6/versions"
},
{
"value": "1.6.43-5ubuntu0.3",
"evidence": "/affected/6/versions"
},
{
"value": "1.6.43-5ubuntu0.4",
"evidence": "/affected/6/versions"
}
]
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{
"name": {
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"evidence": "/affected/7/package/name"
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{
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{
"value": "1.6.47-1.1",
"evidence": "/affected/7/versions"
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{
"value": "1.6.48-1",
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{
"value": "1.6.49-1~exp1",
"evidence": "/affected/7/versions"
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{
"value": "1.6.50-1~exp1",
"evidence": "/affected/7/versions"
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{
"value": "1.6.50-1",
"evidence": "/affected/7/versions"
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{
"value": "1.6.50-1ubuntu0.1",
"evidence": "/affected/7/versions"
},
{
"value": "1.6.50-1ubuntu0.3",
"evidence": "/affected/7/versions"
}
]
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{
"name": {
"value": "libpng1.6",
"evidence": "/affected/8/package/name"
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{
"value": "1.6.55-1",
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],
"affected_versions": [
{
"value": "1.6.50-1",
"evidence": "/affected/8/versions"
},
{
"value": "1.6.51-1",
"evidence": "/affected/8/versions"
},
{
"value": "1.6.53-1",
"evidence": "/affected/8/versions"
},
{
"value": "1.6.54-1",
"evidence": "/affected/8/versions"
}
]
}
],
"severity": "high",
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"aliases": [
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"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N"
},
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"type": "CVSS_V3",
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},
{
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{
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]
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},
"versions": [
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"1.2.49-5ubuntu1",
"1.2.50-1ubuntu1",
"1.2.50-1ubuntu2",
"1.2.50-1ubuntu2.14.04.1",
"1.2.50-1ubuntu2.14.04.2",
"1.2.50-1ubuntu2.14.04.3"
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{
"binary_name": "libpng3",
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{
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"package": {
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"purl": "pkg:deb/ubuntu/libpng?arch=source&distro=esm-infra%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
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"1.2.54-1",
"1.2.54-1ubuntu1",
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"1.2.54-1ubuntu1.1+esm1"
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"database_specific": {
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{
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{
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{
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],
"package": {
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},
"ecosystem_specific": {
"binaries": [
{
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{
"binary_name": "libpng16-devtools",
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},
{
"binary_name": "libpng16-tools",
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],
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}
},
{
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{
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}
],
"package": {
"name": "libpng1.6",
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1.6.34-1",
"1.6.34-1ubuntu0.18.04.1",
"1.6.34-1ubuntu0.18.04.2",
"1.6.34-1ubuntu0.18.04.2+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25646.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "libpng16-16",
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}
],
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}
},
{
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{
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{
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}
],
"package": {
"name": "libpng1.6",
"purl": "pkg:deb/ubuntu/libpng1.6?arch=source&distro=esm-infra%2Ffocal",
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},
"versions": [
"1.6.37-1",
"1.6.37-2",
"1.6.37-2ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25646.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpng-tools",
"binary_version": "1.6.37-2ubuntu0.1~esm2"
},
{
"binary_name": "libpng16-16",
"binary_version": "1.6.37-2ubuntu0.1~esm2"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
},
{
"fixed": "1.6.37-3ubuntu0.4"
}
]
}
],
"package": {
"name": "libpng1.6",
"purl": "pkg:deb/ubuntu/libpng1.6?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1.6.37-3build4",
"1.6.37-3build5",
"1.6.37-3ubuntu0.1",
"1.6.37-3ubuntu0.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25646.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpng-tools",
"binary_version": "1.6.37-3ubuntu0.4"
},
{
"binary_name": "libpng16-16",
"binary_version": "1.6.37-3ubuntu0.4"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.43-5ubuntu0.5"
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]
}
],
"package": {
"name": "libpng1.6",
"purl": "pkg:deb/ubuntu/libpng1.6?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1.6.40-1",
"1.6.40-2",
"1.6.40-3",
"1.6.42-1",
"1.6.43-1",
"1.6.43-3",
"1.6.43-5build1",
"1.6.43-5ubuntu0.1",
"1.6.43-5ubuntu0.3",
"1.6.43-5ubuntu0.4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25646.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpng-tools",
"binary_version": "1.6.43-5ubuntu0.5"
},
{
"binary_name": "libpng16-16t64",
"binary_version": "1.6.43-5ubuntu0.5"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.50-1ubuntu0.4"
}
]
}
],
"package": {
"name": "libpng1.6",
"purl": "pkg:deb/ubuntu/libpng1.6?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"1.6.47-1.1",
"1.6.48-1",
"1.6.49-1~exp1",
"1.6.50-1~exp1",
"1.6.50-1",
"1.6.50-1ubuntu0.1",
"1.6.50-1ubuntu0.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25646.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpng-tools",
"binary_version": "1.6.50-1ubuntu0.4"
},
{
"binary_name": "libpng16-16t64",
"binary_version": "1.6.50-1ubuntu0.4"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.55-1"
}
]
}
],
"package": {
"name": "libpng1.6",
"purl": "pkg:deb/ubuntu/libpng1.6?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.6.50-1",
"1.6.51-1",
"1.6.53-1",
"1.6.54-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25646.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpng-tools",
"binary_version": "1.6.55-1"
},
{
"binary_name": "libpng16-16t64",
"binary_version": "1.6.55-1"
}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-27T04:17:51.797720417Z",
"provider": "osv",
"upstream": [
"CVE-2026-25646"
],
"references": [
"https://ubuntu.com/security/CVE-2026-25646",
"https://www.cve.org/CVERecord?id=CVE-2026-25646",
"https://github.com/pnggroup/libpng/security/advisories/GHSA-g8hp-mq4h-rqm3",
"https://ubuntu.com/security/notices/USN-8035-1",
"https://ubuntu.com/security/notices/USN-8039-1",
"https://ubuntu.com/security/notices/USN-8081-1"
]
},
"related_cves": [
{
"value": "CVE-2026-25646",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 460310,
"published_at": "2026-02-10T18:16:00+00:00"
}