CVE-2026-42784
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
7.4
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-09-16 17:17:18.380000
Last modified
2026-11-03 12:17:30.273000
View original CVE JSON
{
"id": "CVE-2026-42784",
"sourceIdentifier": "[email protected]",
"published": "2026-09-16T17:17:18.380",
"lastModified": "2026-11-03T12:17:30.273",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
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{
"lang": "en",
"value": "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."
}
],
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}