{"id":"CVE-2026-42784","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-42784","generatedAt":"2026-10-28T02:20:32.195Z","title":"The library incorrectly infers key flags for older certificates when a key flags subpacket is missing, leading to a discrepancy in how key capabilities are viewed.","description":"A flaw was found in sequoia-openpgp. The library incorrectly infers key flags for older certificates when a key flags subpacket is missing, leading to a discrepancy in how key capabilities are viewed. This key flag confusion allows an attacker to bypass the back-signature check. Consequently, an attacker can illegitimately bind an arbitrary subkey to their own certificate and forge signatures, completely compromising cryptographic integrity.","published":"2026-09-16T17:17:18.000Z","lastModified":"2026-10-15T15:17:34.000Z","status":"Awaiting Analysis","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N"},"cwe":["CWE-347"],"affected":[],"epss":{"score":0.00313,"percentile":0.24002,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:34160","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:42078","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:42902","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:76733","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:76734","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:76735","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:76737","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:79357","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-42784","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2464122","source":"secalert@redhat.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-42784","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}