Vulnerability · Published Aug 21, 2026 · Assigned by mitre
CVE-2026-77650
Critical 9.8
In plain English
A critical-severity security flaw in append-only-vec from droundy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.8%top 43.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:26.04:LTS | rust-append-only-vec | no fix listed | UBUNTU-CVE-2026-77650 |
| Ubuntu:26.10 | rust-append-only-vec | no fix listed | UBUNTU-CVE-2026-77650 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| droundy | append-only-vec | 0.1.9 |
Weakness: CWE-506 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://blog.rust-lang.org/2026/08/20/supply-chain-attack-on-arrayref
- https://github.com/rustsec/advisory-db/issues/3161
- https://www.stepsecurity.io/blog/arrayref-rust-crate-supply-chain-attack
- https://safedep.io/arrayref-proc-macro1-rust-build-time-malware/
- https://rustsec.org/advisories/RUSTSEC-2026-0262.html