Rust advisories / proc-macro-error
UnmaintainedRUSTSEC-2024-0370 · proc-macro-error
RUSTSEC-2024-0370: proc-macro-error is unmaintained
Short answerNot a bug report: proc-macro-error is no longer maintained, so future security issues will not be fixed. Plan to move to a maintained alternative.
| Crate | proc-macro-error |
|---|---|
| Type | Unmaintained |
| Affected versions | Every version. |
| Fixed in | not applicable (the crate is unmaintained) |
| Severity | not scored |
| Published | 2024-09-01 |
| Last changed | 2026-06-07 |
| Also known as | none |
What to do
- Look for a maintained fork or alternative crate.
- If you cannot move yet, acknowledge it in your audit config so CI stays green while you plan: add
"RUSTSEC-2024-0370"toignorein.cargo/audit.tomlordeny.toml, with a comment saying why. - Find who pulls it in:
cargo tree -i proc-macro-error.
Details from the advisory
proc-macro-error's maintainer seems to be unreachable, with no commits for 2 years, no releases pushed for 4 years, and no activity on the GitLab repo or response to email.
proc-macro-error also depends on syn 1.x, which may be bringing duplicate dependencies into dependant build trees.
Possible Alternative(s)
References
- Package: crates.io/crates/proc-macro-error
- Advisory: rustsec.org/advisories/RUSTSEC-2024-0370.html
- Report: gitlab.com/CreepySkeleton/proc-macro-error/-/issues/20
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
Up next
Same crateproc-macro-error: security historyEvery advisory for this crate, and whether it is safe to use today.Read it next →Did this answer your question?