CVE-2026-42784

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. a secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.4
EG Score
7.4(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
No patch confirmed yet. Sources: redhat.
redhat

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2464122

Vendor Advisories for CVE-2026-42784(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 16:37 UTCEG score recompute
  2. 2026-09-19 16:37 UTCGHSA enrichment
  3. 2026-09-19 05:34 UTCEG score recompute
  4. 2026-09-19 05:34 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 18:32 UTCEG score recompute
  7. 2026-09-18 18:32 UTCGHSA enrichment
  8. 2026-09-18 18:15 UTCEG score recompute
  9. 2026-09-18 18:15 UTCGHSA enrichment
  10. 2026-09-18 16:24 UTCGHSA enrichment
  11. 2026-09-18 05:21 UTCEG score recompute
  12. 2026-09-18 05:21 UTCGHSA enrichment
  13. 2026-09-17 19:31 UTCEPSS rescore
  14. 2026-09-17 18:18 UTCGHSA enrichment
  15. 2026-09-17 06:48 UTCGHSA enrichment
  16. 2026-09-16 19:45 UTCEG score recompute
  17. 2026-09-16 19:45 UTCGHSA enrichment
  18. 2026-09-16 17:26 UTCEG score recompute
  19. 2026-09-16 17:05 UTCEG score recompute
  20. 2026-09-16 17:04 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-42784?
CVE-2026-42784 is a high vulnerability published on September 16, 2026. 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…
When was CVE-2026-42784 disclosed?
CVE-2026-42784 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42784 actively exploited?
CVE-2026-42784 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.7% of all scored CVEs.
What is the CVSS score of CVE-2026-42784?
CVE-2026-42784 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-42784?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42784, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-42784

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