Reported

September 8, 2024

Issued

December 4, 2024

Package

anstream (crates.io)

Type

INFO Unsound

References

• https://github.com/rust-cli/anstyle/issues/156

Patched

• >=0.6.8

Affected Functions

Version

anstream::adapter::strip_str

• <0.6.8

Description

When given a valid UTF8 string "ö\x1b😀", the function in crates/anstream/src/adapter/strip.rs will be confused. The UTF8 bytes are \xc3\xb6 then \x1b then \xf0\x9f\x98\x80.

When looping over "non-printable bytes" \x1b\xf0 will be considered as some non-printable sequence.

This will produce a broken str from the incorrectly segmented bytes via str::from_utf8_unchecked, and that should never happen.

Full credit goes to @Ralith who reviewed this code and asked @burakemir to follow up.

Advisory available under CC0-1.0 license.