ALPINE-CVE-2026-6100
Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-used. This scenario can be triggered if the process is under memory pressure. The fix cleans up the dangling pointer in this specific error condition. The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable.
ALPINE-CVE-2026-6100
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-2026-6100
python3
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 3.12.14-r0
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
python3
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 3.12.14-r0
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
python3
Source reference: /affected/2/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 3.12.14-r0
Source reference:
/affected/2/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": "3.12.14-r0"
}
]
}
],
"package": {
"name": "python3",
"purl": "pkg:apk/alpine/python3?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-6100.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.12.14-r0"
}
]
}
],
"package": {
"name": "python3",
"purl": "pkg:apk/alpine/python3?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-6100.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.12.14-r0"
}
]
}
],
"package": {
"name": "python3",
"purl": "pkg:apk/alpine/python3?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-6100.json"
},
"ecosystem_specific": {}
}
]Publisher severity
No explicit severity was provided.
- Event
- #54597 · Revision 1
- Added to Heist Feed
- Publisher date