CVE-2026-75584

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

ION-DTN before 4.2.1-a.1 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash the ION process by sending a BPv7 bundle with a zero-length payload. The canonicalizePayloadBlock() function in bpsec_util.c passes bundle->payload.length to zco_clone() without validating it against zero, causing a failed CHKZERO assertion that triggers sm_Abort() and terminates the process with SIGABRT before any HMAC verification occurs, requiring no valid key or credential to exploit.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 10, 2026
Patch available. Sources: github.
generic

ION-DTN < 4.2.1-a.1 Denial of Service via canonicalizePayloadBlock() Assertion | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ion-dtn-a-1-denial-of-service-via-canonicalizepayloadblock-assertion
github Patch Available

Reachable assertion in canonicalizePayloadBlock(): zero-length BPv7 payload reaches zco_clone(length=0) and aborts the process (BPSec BIB path; second call site not covered by the GHSA-27wg-h3xq-4p9g fix) · Advisory · nasa-jpl/ION-DTN · GitHub

https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-9vgc-2r6g-6qwf

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× 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 17:15 UTCEG score recompute
  2. 2026-09-19 05:54 UTCEG score recompute
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 18:33 UTCEG score recompute
  5. 2026-09-18 17:29 UTCEG score recompute
  6. 2026-09-17 19:50 UTCEG score recompute
  7. 2026-09-16 20:14 UTCEG score recompute
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 08:53 UTCEG score recompute
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 09:27 UTCEG score recompute
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-13 23:24 UTCEG score recompute
  14. 2026-09-13 00:42 UTCEG score recompute
  15. 2026-09-12 15:02 UTCEPSS rescore
  16. 2026-09-12 02:00 UTCEG score recompute
  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-10 14:19 UTCEG score recompute
  19. 2026-09-10 14:00 UTCEG score recompute
  20. 2026-09-10 13:59 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-75584?
CVE-2026-75584 is a high vulnerability published on September 10, 2026. ION-DTN before 4.2.1-a.1 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash the ION process by sending a BPv7 bundle with a zero-length payload. The canonicalizePayloadBlock() function in bpsecutil.c passes bundle->payload.length to zcoclone() without…
When was CVE-2026-75584 disclosed?
CVE-2026-75584 was first published in the National Vulnerability Database on September 10, 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-2026-75584 actively exploited?
CVE-2026-75584 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 63.4% of all scored CVEs.
What is the CVSS score of CVE-2026-75584?
CVE-2026-75584 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-75584?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75584, 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

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