CVE-2026-77651

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-21. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

The arrayref crate 0.3.10 for Rust can trigger execution of malicious code when compiling a project that uses the crate, because it has a rogue dependency that registers with a command-and-control server to offer arbitrary code execution.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

August 21, 2026

Last Modified

September 9, 2026

Advisory Details (5)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Rust Supply-Chain Attack: arrayref, internment, and append-only-vec Poisoned by the proc-macro1 Build-Time Dropper - StepSecurity

https://www.stepsecurity.io/blog/arrayref-rust-crate-supply-chain-attack
generic

Malicious Rust Crate arrayref Runs a Build-Time Payload - Real-time Open Source Software Supply Chain Security

https://safedep.io/arrayref-proc-macro1-rust-build-time-malware/
generic

RUSTSEC-2026-0260: arrayref: `arrayref` 0.3.10 was removed from crates.io due to a malicious dependency › RustSec Advisory Database

https://rustsec.org/advisories/RUSTSEC-2026-0260.html
generic

Malware: `arrayref` 0.3.10 executes a remote payload at build time via typosquatted `proc-macro1` · Issue #3161 · rustsec/advisory-db · GitHub

https://github.com/rustsec/advisory-db/issues/3161
generic

Supply chain attack on arrayref | Rust Blog

https://blog.rust-lang.org/2026/08/20/supply-chain-attack-on-arrayref

Vendor Advisories for CVE-2026-77651(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 53× in last 7d / 225× 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 225 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-77651?
CVE-2026-77651 is a critical vulnerability published on August 21, 2026. The arrayref crate 0.3.10 for Rust can trigger execution of malicious code when compiling a project that uses the crate, because it has a rogue dependency that registers with a command-and-control server to offer arbitrary code execution.
When was CVE-2026-77651 disclosed?
CVE-2026-77651 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77651 actively exploited?
CVE-2026-77651 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 61.3% of all scored CVEs.
What is the CVSS score of CVE-2026-77651?
CVE-2026-77651 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-77651?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77651, 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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