ALPINE-CVE-2026-34757
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57.
ALPINE-CVE-2026-34757
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-2026-34757
libpng
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.6.57-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
- 1.6.57-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
- 1.6.57-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
- 1.6.57-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
- 1.6.57-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": "1.0.9"
},
{
"fixed": "1.6.57-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-2026-34757.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.0.9"
},
{
"fixed": "1.6.57-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-2026-34757.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.0.9"
},
{
"fixed": "1.6.57-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-2026-34757.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.0.9"
},
{
"fixed": "1.6.57-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-2026-34757.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.0.9"
},
{
"fixed": "1.6.57-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-2026-34757.json"
},
"ecosystem_specific": {}
}
]Publisher severity
No explicit severity was provided.
- Event
- #54306 · Revision 1
- Added to Heist Feed
- Publisher date