# CVE-2026-77650

## Summary

- **CVE ID:** CVE-2026-77650
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-506
- **Published:** Aug 21, 2026
- **Last Modified:** Aug 21, 2026

## Description

The append-only-vec crate 0.1.9 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.

## Affected Products

- droundy — append-only-vec (0.1.9)

## References

- [CNA](https://blog.rust-lang.org/2026/08/20/supply-chain-attack-on-arrayref)
- [CNA](https://github.com/rustsec/advisory-db/issues/3161)
- [CNA](https://www.stepsecurity.io/blog/arrayref-rust-crate-supply-chain-attack)
- [CNA](https://safedep.io/arrayref-proc-macro1-rust-build-time-malware/)
- [CNA](https://rustsec.org/advisories/RUSTSEC-2026-0262.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._