7.4

CVE-2026-42784: Sequoia-openpgp: sequoia-openpgp: cryptographic integrity compromise via key flag confusion

Awaiting analysis
AliasesRHSA-2026:42902RHSA-2026:76733RHSA-2026:76734
Published 16-09-2026Last modified 03-11-2026

Vulnerability summary

CVE-2026-42784 is a high (CVSS 7.4) vulnerability in rust-sequoia-openpgp. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 24.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.4, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.31%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2
RHSA-2026:34160RHSA-2026:42078

Timeline

  1. 16-09-2026
    PublishedVulnerability first disclosed.
  2. 03-11-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

24%

Versus all other CVEs

30-day change

Increase +0.11 pp

From 0.20% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat15 products
  • podman-sequoia< 0:0.3.2-4.hum1
  • rpm-sequoia< 0:1.10.2.1-1.el9_8 | < 0:1.10.2.1-1.el10_2
  • rpm-sequoia-debuginfo< 0:1.10.2.1-1.el9_8 | < 0:1.10.2.1-1.el10_2
  • rpm-sequoia-devel< 0:1.10.2.1-1.el9_8 | < 0:1.10.2.1-1.el10_2
  • rust-podman-sequoia< 0:0.3.2-4.hum1
Debian1 product
  • rust-sequoia-openpgpAll versions (No fix recorded) | < 2.2.0-2
Ubuntu1 product
  • rust-sequoia-openpgpAll versions (No fix recorded)

3 vendors · 17 products

References

22 links
Show all 22 references