{"id":"CVE-2026-42784","published":"2026-09-16T17:17:18.380","lastModified":"2026-09-21T11:17:08.970","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.","cvssScore":7.4,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N","cwes":["CWE-347"],"vendors":[],"products":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:42902","tags":[]},{"url":"https://access.redhat.com/security/cve/CVE-2026-42784","tags":[]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2464122","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}