CVE-2026-27820 zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption
| Reporter | Title | Published | Views | Family All 100 |
|---|---|---|---|---|
 | CVE-2026-27820 | 16 Apr 202617:27 | – | attackerkb |
 | Amazon Linux 2023 : ruby3.4, ruby3.4-bundled-gems, ruby3.4-default-gems (ALAS2023-2026-1807) | 8 Jun 202600:00 | – | nessus |
| Debian dla-4716 : libruby2.7 - security update | 4 Aug 202600:00 | – | nessus |
| MiracleLinux 8 : ruby:3.3 (AXSA:2026-1503:01) | 10 Aug 202600:00 | – | nessus |
| MiracleLinux 9 : ruby:3.3 (AXSA:2026-1647:01) | 25 Aug 202600:00 | – | nessus |
| MiracleLinux 9 : ruby:4.0 (AXSA:2026-1667:01) | 27 Aug 202600:00 | – | nessus |
| Oracle Linux 8 : ruby:3.3 (ELSA-2026-50728) | 10 Aug 202600:00 | – | nessus |
| Oracle Linux 10 : ruby4.0 (ELSA-2026-50773) | 14 Aug 202600:00 | – | nessus |
| Oracle Linux 10 : ruby (ELSA-2026-50778) | 14 Aug 202600:00 | – | nessus |
| Oracle Linux 9 : ruby:4.0 (ELSA-2026-50827) | 10 Aug 202600:00 | – | nessus |
10
[
{
"vendor": "ruby",
"product": "zlib",
"versions": [
{
"version": "< 3.0.1",
"status": "affected"
},
{
"version": ">= 3.1.0, < 3.1.2",
"status": "affected"
},
{
"version": ">= 3.2.0, < 3.2.3",
"status": "affected"
}
]
}
]| Source | Link |
|---|---|
| github | www.github.com/ruby/zlib/security/advisories/GHSA-g857-hhfv-j68w |
| hackerone | www.hackerone.com/reports/3467067 |
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16 Apr 2026 17:27Current
CVSS 46.3
EPSS0.00561