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 — 4 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
36%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 21, 2026

Advisory Details (5)

Auto-updated Aug 21, 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 16× in last 7d / 16× 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. 2026-08-22 06:45 UTCGHSA enrichment
  2. 2026-08-22 02:38 UTCEG score recompute
  3. 2026-08-22 02:38 UTCGHSA enrichment
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-21 22:32 UTCGHSA enrichment
  6. 2026-08-21 18:27 UTCGHSA enrichment
  7. 2026-08-21 14:21 UTCEG score recompute
  8. 2026-08-21 14:21 UTCGHSA enrichment
  9. 2026-08-21 13:34 UTCEG score recompute
  10. 2026-08-21 13:34 UTCGHSA enrichment
  11. 2026-08-21 09:42 UTCGHSA enrichment
  12. 2026-08-21 05:36 UTCEG score recompute
  13. 2026-08-21 05:36 UTCGHSA enrichment
  14. 2026-08-21 01:30 UTCEG score recompute
  15. 2026-08-21 00:51 UTCEG score recompute
  16. 2026-08-21 00:51 UTCMITRE cvelistV5first tracked

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. 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 63.6% 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.

Dependency Blast Radius

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