CVE-2026-42784
HIGH
MEDIUM
Priority: 0.02
BB Relevance:
65/100
Published: 2026-09-16
Modified: 2026-11-04
First seen: 2026-11-03
Status: active
Attack Surface
Network
Low Complexity
No Auth
Integ. Impact
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
Required
S:
Changed
C:
None
I:
High
A:
None
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.
Weakness Classification (1)
References & Advisories (11)
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vdb-entry
x_refsource_REDHAT
issue-tracking
x_refsource_REDHAT