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RUSTSEC-2026-0262 json

`append-only-vec` 0.1.9 was removed from crates.io due to a malicious dependency

published 2mo ago modified 22d ago

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
—
no score, EPSS covers CVEs only
public exploits
0
none known

Summary

A new version of the `append-only-vec` crate was published with a direct dependency on `proc-macro1`, which would execute a malicious build script.

The compromised version of this crate was published on 2026-08-20, and was removed approximately 107 minutes later.

The compromised crate version was used as part of a malware campaign targeted at users of `arrayref`, which was downloaded 2,285 times before being removed; see [the `arrayref` advisory][arrayref-advisory] for more detail.

[arrayref-advisory]: https://rustsec.org/advisories/RUSTSEC-2026-0260.html

Patch / fix

  • crates.io append-only-vec 0.1.10-0

Is RUSTSEC-2026-0262 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Affected packages

ecosystem package affected fixed in
crates.io append-only-vec
>=0.1.9, <0.1.10-0
0.1.10-0

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.