Disclosure summary
Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after re-use under memory pressure
Source-reported weakness categories
CWE-416
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Microsoft Security Updates (CVRF) · 2026-Apr
Open original source · Updated Aug 10, 2026
Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after re-use under memory pressure
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 8.1
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 python3 3.12.9-10 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 python3 3.12.9-14 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 python3 3.12.9-11 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 python3 3.12.9-13 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- CBL-Mariner Releases · build 3.12.9-14 · product IDs 21694-17084, 21492-17084
- Vendor guidance · product IDs 21694-17084, 21492-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-04-18T21:01:45-04:00
MODIFIED 2026-08-10T10:53:17-04:00
INGESTED 2026-10-08T12:45:03-04:00