Risk Scores
CVSS v4.0
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
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| RubyGems | zlib | 3.2.0, 3.1.0, 0 |
| ruby | zlib | < 3.0.1, >= 3.1.0, < 3.1.2, >= 3.2.0, < 3.2.3 |
Timeline
- Mar 5, 2026 PoC Published
- Mar 5, 2026 PoC Published
- Mar 6, 2026 PoC Published
- Apr 16, 2026 CVE Published
- Apr 17, 2026 Security Advisory
References
- https://github.com/ruby/zlib/security/advisories/GHSA-g857-hhfv-j68w url
- https://hackerone.com/reports/3467067 url
- https://nvd.nist.gov/vuln/detail/CVE-2026-27820 advisory
- https://github.com/ruby/zlib package
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/zlib/CVE-2026-27820.yml url
- https://www.ruby-lang.org/en/news/2026/03/05/buffer-overflow-zlib-cve-2026-27820 url