CRITICALRubyGems →
Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption
Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption
Affected packages
- zlib— 3.2.0 → 3.2.3
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/ruby/zlib/security/advisories/GHSA-g857-hhfv-j68w
- https://nvd.nist.gov/vuln/detail/CVE-2026-27820
- https://hackerone.com/reports/3467067
- https://github.com/ruby/zlib
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/zlib/CVE-2026-27820.yml
- https://www.ruby-lang.org/en/news/2026/03/05/buffer-overflow-zlib-cve-2026-27820
Structured record: https://osv.dev/vulnerability/GHSA-g857-hhfv-j68w
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