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BIT-LIBPYTHON-2026-6100 Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after re-use under memory pressure

🗓️ 06 Jul 2026 15:23:15Reported by GoogleType 
osv
 osv🔗 osv.dev👁 2 Views

Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after MemoryError during reuse.

Related
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB		CVE-2026-6100
13 Apr 202617:15
–attackerkb
Tenable Nessus		Amazon Linux 2023 : python3.14, python3.14-devel, python3.14-freethreading (ALAS2023-2026-1617)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3, python3-devel, python3-idle (ALAS2023-2026-1618)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.12, python3.12-devel, python3.12-idle (ALAS2023-2026-1619)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.11, python3.11-devel, python3.11-idle (ALAS2023-2026-1620)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.13, python3.13-devel, python3.13-freethreading (ALAS2023-2026-1638)
20 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : python, --advisory ALAS2-2026-3280 (ALAS-2026-3280)
14 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : python3, --advisory ALAS2-2026-3281 (ALAS-2026-3281)
14 May 202600:00
–nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0112: python3.11 (ALINUX3-SA-2026:0112)
18 May 202600:00
–nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0113: python3 (ALINUX3-SA-2026:0113)
18 May 202600:00
–nessus
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06 Jul 2026 16:11Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.18.1
CVSS 49.1
EPSS0.00579
SSVC
use-after-freelzma decompressorbz2 decompressorgzip filememory errorreuse
2