Improper Verification of Cryptographic Signature Affecting rust-sequoia-openpgp package, versions <2.2.0-2


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.31% (23rd percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-RUSTSEQUOIAOPENPGP-16896421
  • published27 May 2026
  • disclosed16 Sept 2026

Introduced: 27 May 2026

CVE-2026-42784  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade Debian:unstable rust-sequoia-openpgp to version 2.2.0-2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rust-sequoia-openpgp package and not the rust-sequoia-openpgp package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1