CVE-2026-5474

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 70% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

A vulnerability was found in NASA cFS up to 7.0.0. This affects the function CFE_MSG_GetSize of the file apps/to_lab/fsw/src/to_lab_passthru_encode.c of the component CCSDS Packet Header Handler. Performing a manipulation results in heap-based buffer overflow. The attacker must have access to the local network to execute the attack. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

April 3, 2026

Last Modified

July 24, 2026

Advisory Details (2)

Auto-updated Apr 30, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

[SECURITY] Heap over-read via untrusted CCSDS length in TO_LAB sendto · Issue #952 · nasa/cFS · GitHub

https://github.com/nasa/cFS/issues/952
generic

GitHub - nasa/cFS: The Core Flight System (cFS) · GitHub

https://github.com/nasa/cFS/

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 52× 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.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-26 09:17 UTCEG score recompute▲ 2.50
  4. 2026-07-26 09:17 UTCGHSA enrichment
  5. 2026-07-25 14:18 UTCEPSS rescore
  6. 2026-07-25 14:18 UTCEPSS rescore
  7. 2026-07-24 20:11 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
  8. 2026-07-24 14:18 UTCEPSS rescore
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  10. 2026-07-23 14:18 UTCEPSS rescore
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  12. 2026-07-23 03:19 UTCEG score recompute
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  21. 2026-07-17 03:24 UTCOSV refresh
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  27. 2026-06-27 03:08 UTCEPSS rescore
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  40. 2026-06-18 17:52 UTCEPSS rescore
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  46. 2026-06-14 23:18 UTCEPSS rescore
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  48. 2026-06-12 23:12 UTCEPSS rescore
  49. 2026-06-12 23:12 UTCEPSS rescore
  50. 2026-06-11 21:58 UTCGHSA enrichment
  51. 2026-06-11 14:00 UTCEPSS rescore
  52. 2026-06-10 22:19 UTCEPSS rescore
  53. 2026-06-10 15:27 UTCGHSA enrichment
  54. 2026-06-10 13:22 UTCEPSS rescore
  55. 2026-06-09 14:28 UTCGHSA enrichment
  56. 2026-06-08 14:17 UTCEPSS rescore
  57. 2026-06-08 11:45 UTCGHSA enrichment
  58. 2026-06-07 15:25 UTCEPSS rescore
  59. 2026-06-07 10:50 UTCGHSA enrichment
  60. 2026-06-06 13:47 UTCEPSS rescore
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  74. 2026-05-28 13:44 UTCEPSS rescore
  75. 2026-05-27 13:40 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-5474?
CVE-2026-5474 is a high vulnerability published on April 3, 2026. A vulnerability was found in NASA cFS up to 7.0.0. This affects the function CFEMSGGetSize of the file apps/tolab/fsw/src/tolabpassthruencode.c of the component CCSDS Packet Header Handler. Performing a manipulation results in heap-based buffer overflow. The attacker must have access to the local…
When was CVE-2026-5474 disclosed?
CVE-2026-5474 was first published in the National Vulnerability Database on April 3, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5474 actively exploited?
CVE-2026-5474 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 69.9% of all scored CVEs.
What is the CVSS score of CVE-2026-5474?
CVE-2026-5474 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-5474?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5474, 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.

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