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python3

A use-after-free vulnerability exists in Python's decompression modules lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile when a MemoryError occurs during decompression and the decompressor instance is reused. This flaw can lead to arbitrary code execution or information disclosure. The vulnerability only affects scenarios where decompressor instances are reused after a MemoryError; one-shot decompression helper functions are not affected. A patch is available to address this issue.

CVE-2026-6100 describes a use-after-free vulnerability in Python's decompression modules (lzma.LZMADecompressor, bz2.BZ2Decompressor, gzip.GzipFile) triggered when a memory allocation fails with a MemoryError and the decompression instance is reused across multiple decompression calls. The vulnerability arises from a dangling pointer not being cleaned up in this error condition. Helper functions that create new decompressor instances per call are not vulnerable. The issue is fixed by cleaning up the dangling pointer when a MemoryError occurs during decompression.

Detailed information about Red Hat Security Advisory: python3 security update affecting Red Hat Product Security Red Hat. Get real-time updates, technical detai

Red Hat Security Advisory: python3 security update - Live Threat Intelligence - Threat Radar | OffSeq.com

https://access.redhat.com/errata/RHSA-2026:52400

https://access.redhat.com/security/updates/classification/#important

2457932

Canonical URL

Python2.7: Use-after-free (UAF) was possible in the lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile when a memory allocation fails with a… (CVE-2026-6100)

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