CVE-2026-79954

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% 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
Trending — 4 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

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

NASA CryptoLib 1.5.0 contains an authentication downgrade vulnerability in the Telecommand (TC) receive path. The receiver selects the Security Association used for SDLS processing solely from the SPI field inside the incoming frame, but it does not verify that the selected SA is authorized for the frame's GVCID.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
No patch confirmed yet.
generic

GitHub - nasa/CryptoLib: Provide a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communications between a spacecraft running the core Flight System (cFS) and a ground station. · GitHub

https://github.com/nasa/CryptoLib
generic

NASA CryptoLib 1.5.0 - TC receive path accepts Security Associations from the wrong GVCID | Fluid Attacks

https://fluidattacks.com/advisories/linkin

Vendor Advisories for CVE-2026-79954(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 19× in last 7d / 19× 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. 2026-09-21 05:04 UTCEG score recompute
  2. 2026-09-21 05:04 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 17:46 UTCGHSA enrichment
  5. 2026-09-20 06:28 UTCGHSA enrichment
  6. 2026-09-19 19:10 UTCEG score recompute
  7. 2026-09-19 19:10 UTCGHSA enrichment
  8. 2026-09-19 07:50 UTCGHSA enrichment
  9. 2026-09-18 20:33 UTCEG score recompute
  10. 2026-09-18 20:33 UTCGHSA enrichment
  11. 2026-09-18 20:10 UTCEG score recompute
  12. 2026-09-18 20:10 UTCGHSA enrichment
  13. 2026-09-18 19:48 UTCEG score recompute
  14. 2026-09-18 19:48 UTCGHSA enrichment
  15. 2026-09-18 19:28 UTCEPSS rescore
  16. 2026-09-18 12:47 UTCGHSA enrichment
  17. 2026-09-18 01:30 UTCEG score recompute
  18. 2026-09-18 01:09 UTCEG score recompute
  19. 2026-09-18 01:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-79954?
CVE-2026-79954 is a high vulnerability published on September 18, 2026. NASA CryptoLib 1.5.0 contains an authentication downgrade vulnerability in the Telecommand (TC) receive path. The receiver selects the Security Association used for SDLS processing solely from the SPI field inside the incoming frame, but it does not verify that the selected SA is authorized for the…
When was CVE-2026-79954 disclosed?
CVE-2026-79954 was first published in the National Vulnerability Database 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-2026-79954 actively exploited?
CVE-2026-79954 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 74.5% of all scored CVEs.
What is the CVSS score of CVE-2026-79954?
CVE-2026-79954 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-79954?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79954, 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-2026-79954

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