CVE-2026-77649

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 internment crate 0.8.7 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
37%
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-2026-0266: internment: `internment` 0.8.7 was removed from crates.io due to a malicious dependency › RustSec Advisory Database

https://rustsec.org/advisories/RUSTSEC-2026-0266.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-2026-77649(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 55× in last 7d / 238× 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 238 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-77649?
CVE-2026-77649 is a critical vulnerability published on August 21, 2026. The internment crate 0.8.7 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-2026-77649 disclosed?
CVE-2026-77649 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-2026-77649 actively exploited?
CVE-2026-77649 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 62.8% of all scored CVEs.
What is the CVSS score of CVE-2026-77649?
CVE-2026-77649 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-77649?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77649, 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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