VDB
DEBIAN-CVE-2026-27820
DEBIAN-CVE-2026-27820
PUBLISHED
CVSS 1.7000000476837158 LOW
zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstream_buffer_ungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.
Risk Scores
CVSS 4.0
1.7000000476837158
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:14 | ruby3.3 | 0, 3.3.8-2, 0 |
| Debian:11 | ruby2.7 | 2.7.5-1, 2.7.4-1, 2.7.4-1 |
| Debian:13 | ruby3.3 | 0, 3.3.8-2, 0 |
| Debian:12 | ruby3.1 | 3.1.2-8.4, 3.1.2-8.5, 3.1.2-8.3 |
Exploit Intelligence
- setup.sh (github-poc)
Timeline
- Apr 16, 2026 CVE Published
- Apr 28, 2026 CVE Updated