CVE-2026-79954

HIGHPre-NVD 8.78.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (46th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-82611 (ENISA EUVD) · GHSA-64r5-qp28-crvm (GitHub Security Advisories)Source: ENISA EUVD

8.7EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.7Exploit: None knownExposed services: Not assessed

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

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
8.7HIGHmedium confidence
EG Risk
54
EG Risk 54/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity87% × 45%
Impact severity (EG Severity): CVSS 8.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.7): severity, escalated by confirmed exploitation. This CVE's 8.7 is its impact severity (EG Severity), not escalated.

EG Severity
8.7 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
No fix on record yet.
Web page

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
Web page

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 9× in last 7d / 69× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 137 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 37 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  4. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  5. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  6. 2026-10-28 12:22 UTCEG score recompute
  7. 2026-10-28 12:22 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  9. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  10. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  11. 2026-10-25 13:59 UTCEG score recompute
  12. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  14. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  15. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  16. 2026-10-20 18:16 UTCEG score recompute
  17. 2026-10-20 18:15 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  19. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  20. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  21. 2026-10-18 03:10 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  23. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  24. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 45th percentile
Show 75 more
  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  2. 2026-10-13 06:35 UTCEG score recompute
  3. 2026-10-13 06:34 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  4. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  5. 2026-10-12 14:58 UTCEG score recompute
  6. 2026-10-12 01:49 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  7. 2026-10-11 19:21 UTCEG score recompute
  8. 2026-10-11 16:37 UTCEG score recompute
  9. 2026-10-11 14:07 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  10. 2026-10-11 13:56 UTCEG score recompute
  11. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  12. 2026-10-11 02:50 UTCEG score recompute
  13. 2026-10-11 02:49 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  14. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  15. 2026-10-10 14:47 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  16. 2026-10-10 03:27 UTCEG score recompute
  17. 2026-10-10 03:27 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  18. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  19. 2026-10-09 16:09 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  20. 2026-10-09 04:51 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  21. 2026-10-08 17:33 UTCEG score recompute
  22. 2026-10-08 17:32 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  23. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  24. 2026-10-08 06:14 UTCEG score recompute
  25. 2026-10-08 06:14 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  26. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  27. 2026-10-07 18:55 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  28. 2026-10-07 07:37 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  29. 2026-10-06 20:19 UTCEG score recompute
  30. 2026-10-06 20:19 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  31. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  32. 2026-10-06 09:02 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  33. 2026-10-05 21:45 UTCEG score recompute
  34. 2026-10-05 21:45 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  35. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  36. 2026-10-05 10:25 UTCEG score recompute
  37. 2026-10-05 10:25 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  38. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  39. 2026-10-04 23:07 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  40. 2026-10-04 11:46 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  41. 2026-10-04 00:29 UTCEG score recompute
  42. 2026-10-04 00:29 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  43. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  44. 2026-10-03 13:12 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  45. 2026-10-03 01:55 UTCEG score recompute
  46. 2026-10-03 01:55 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  47. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  48. 2026-10-02 14:37 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  49. 2026-10-02 03:10 UTCEG score recompute
  50. 2026-10-02 03:10 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  51. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  52. 2026-10-01 15:34 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  53. 2026-10-01 04:10 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  54. 2026-09-30 16:52 UTCEG score recompute
  55. 2026-09-30 16:52 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  56. 2026-09-30 04:11 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  57. 2026-09-29 16:54 UTCEG score recompute
  58. 2026-09-29 16:54 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  59. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  60. 2026-09-29 05:36 UTCEG score recompute
  61. 2026-09-29 05:36 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  62. 2026-09-28 18:19 UTCEG score recompute
  63. 2026-09-28 18:19 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  64. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  65. 2026-09-28 07:02 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  66. 2026-09-27 19:41 UTCEG score recompute
  67. 2026-09-27 19:41 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  68. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  69. 2026-09-27 08:23 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  70. 2026-09-26 21:06 UTCEG score recompute
  71. 2026-09-26 21:06 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  72. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  73. 2026-09-26 09:49 UTCEG score recompute
  74. 2026-09-26 09:49 UTCGHSA enrichmentGHSA-64r5-qp28-crvm · GitHub severity HIGH
  75. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.6% · 44th percentile

Frequently asked(5)

What is CVE-2026-79954?
CVE-2026-79954 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-79954 was made public on September 18, 2026: that is the date its CVE record's CNA, Fluid Attacks, gives for when the vulnerability was made public. The CVE record itself was published on September 18, 2026. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-79954 actively exploited?
CVE-2026-79954 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-79954?
CVE-2026-79954 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-79954?
No fix for CVE-2026-79954 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-79954 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-79954

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