ALPINE-CVE-2026-25646
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.
ALPINE-CVE-2026-25646
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:ALPINE-CVE-2026-25646
libpng
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.6.55-r0
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
libpng
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.6.55-r0
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
libpng
Source reference: /affected/2/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.6.55-r0
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
libpng
Source reference: /affected/3/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.6.55-r0
Source reference:
/affected/3/ranges - Prerequisites
- Not stated in this record
libpng
Source reference: /affected/4/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.6.55-r0
Source reference:
/affected/4/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.55-r0"
}
]
}
],
"package": {
"name": "libpng",
"purl": "pkg:apk/alpine/libpng?arch=source",
"ecosystem": "Alpine:v3.20"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-25646.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.55-r0"
}
]
}
],
"package": {
"name": "libpng",
"purl": "pkg:apk/alpine/libpng?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-25646.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.55-r0"
}
]
}
],
"package": {
"name": "libpng",
"purl": "pkg:apk/alpine/libpng?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-25646.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.55-r0"
}
]
}
],
"package": {
"name": "libpng",
"purl": "pkg:apk/alpine/libpng?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-25646.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.55-r0"
}
]
}
],
"package": {
"name": "libpng",
"purl": "pkg:apk/alpine/libpng?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-25646.json"
},
"ecosystem_specific": {}
}
]Publisher severity
No explicit severity was provided.
- Event
- #54192 · Revision 1
- Added to Heist Feed
- Publisher date