UnmaintainedRUSTSEC-2025-0056 · adler
RUSTSEC-2025-0056: adler crate is unmaintained, use adler2 instead
Short answerNot a bug report: adler is no longer maintained, so future security issues will not be fixed. The advisory points to adler2 as the replacement.
| Crate | adler |
|---|---|
| Type | Unmaintained |
| Affected versions | Every version. |
| Fixed in | not applicable (the crate is unmaintained) |
| Severity | not scored |
| Published | 2025-09-05 |
| Last changed | 2025-09-05 |
| Also known as | none |
What to do
- Move to adler2 (our data on it).
- If you cannot move yet, acknowledge it in your audit config so CI stays green while you plan: add
"RUSTSEC-2025-0056"toignorein.cargo/audit.tomlordeny.toml, with a comment saying why. - Find who pulls it in:
cargo tree -i adler.
Details from the advisory
The adler crate is no longer actively maintained. If you rely on this crate, consider switching to a maintained alternative.
Recommended alternatives
References
- Package: crates.io/crates/adler
- Advisory: rustsec.org/advisories/RUSTSEC-2025-0056.html
- Web: github.com/jonas-schievink/adler
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 crateadler: security historyEvery advisory for this crate, and whether it is safe to use today.Read it next →Did this answer your question?