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: 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: —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
49(Track)
EG Risk 49/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
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-2026-0266: 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 6× in last 7d / 6× 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. 2026-08-21 08:58 UTCGHSA enrichment
  2. 2026-08-21 05:14 UTCEG score recompute
  3. 2026-08-21 05:14 UTCGHSA enrichment
  4. 2026-08-21 01:30 UTCEG score recompute
  5. 2026-08-21 00:51 UTCEG score recompute
  6. 2026-08-21 00:51 UTCMITRE cvelistV5first tracked

Frequently asked(4)

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. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
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

Explore the affected products and dependency analysis for CVE-2026-77649

Explore →

Is Your Infrastructure Affected by CVE-2026-77649?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs