{"id":"CVE-2025-8556","aliases":["GHSA-2x5j-vhc8-9cwm","GO-2025-3754"],"url":"https://o3.security/vulnerability/CVE-2025-8556","summary":"Github.com/cloudflare/circl: circl-fourq: missing and wrong validation can lead to incorrect results","details":"A flaw was found in CIRCL's implementation of the FourQ elliptic curve. This vulnerability allows an attacker to compromise session security via low-order point injection and incorrect point validation during Diffie-Hellman key exchange.","published":"2025-08-06T08:48:17.946Z","modified":"2026-07-15T01:49:12.375950511Z","cvss":{"score":3.7,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/cloudflare/circl","fixedVersion":"1.6.1"}],"fix":null,"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://github.com/cloudflare/circl/"},{"type":"WEB","url":"https://github.com/cloudflare/circl/tree/v1.6.1"},{"type":"WEB","url":"https://news.ycombinator.com/item?id=45669593"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2025-8556"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8556.json"},{"type":"ADVISORY","url":"https://github.com/cloudflare/circl/security/advisories/GHSA-2x5j-vhc8-9cwm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-8556"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2371624"},{"type":"PACKAGE","url":"https://github.com/cloudflare/circl"},{"type":"ARTICLE","url":"https://www.botanica.software/blog/cryptographic-issues-in-cloudflares-circl-fourq-implementation"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:12.375950511Z"}}