Disclosure summary
zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption
Source-reported weakness categories
CWE-120
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 May 06, 2026
zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 ruby 3.3.5-8 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 zlib 1.3.2-1 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 ruby 3.3.5-7 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- CBL-Mariner Releases · build 3.3.5-8 · product IDs 21312-17084, 20884-17084
- Vendor guidance · product IDs 21312-17084, 20884-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-04-17T21:01:50-04:00
MODIFIED 2026-05-06T10:52:20-04:00
INGESTED 2026-10-08T12:40:42-04:00