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cnvd-2022-62201

EUVD-2026-233950

fkie_cve-2022-31100

rulex is a new, portable, regular expression language. When parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a string literal or after a backslash, because rulex tries to slice into the code point and panics as a result. This is a security concern for you, if your service parses untrusted rulex expressions (expressions provided by an untrusted user), and your service becomes unavailable when the thread running rulex panics. The crashes are fixed in version **0.4.3**. Affected users are advised to update to this version. The only known workaround for this issue is to assume that regular expression parsing will panic and to add logic to catch panics.

GHSA-8v9w-p43c-r885 — Reachable Assertion in rulex

Affected: crates.io: rulex

### Impact When parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a string literal or after a backslash, because rulex tries to slice into the code point and panics as a result.

This is a security concern for you, if - your service parses untrusted rulex expressions (expressions provided by an untrusted user), and - your service becomes unavailable when the thread running rulex panics.

### Patches The crashes are fixed in version **0.4.3**. Affected users are advised to update to this version.

### Workarounds You can use `catch_unwind` to recover from panics.

### For more information If you have any questions or comments about this advisory: * Open an issue in [rulex](https://github.com/rulex-rs/rulex/issues) * Email me at [ludwig.stecher@gmx.de](mailto:ludwig.stecher@gmx.de)

### Credits

Credit for finding these bugs goes to

- [cargo fuzz](https://github.com/rust-fuzz/cargo-fuzz) and [afl.rs](https://github.com/rust-fuzz/afl.rs) - [evanrichter](https://github.com/evanrichter) - [ForAllSecure Mayhem](https://forallsecure.com/)

gsd-2022-31100

RUSTSEC-2022-0031 — Panic due to improper UTF-8 indexing

Affected: crates.io: rulex

When parsing untrusted rulex expressions, rulex may panic, possibly enabling a Denial of Service attack. This happens when the expression contains a multi- byte UTF-8 code point in a string literal or after a backslash, because rulex tries to slice into the code point and panics as a result.

The flaw was corrected in commits `fac6d58b25` and `330b3534e7` by using `len_utf8()` to derive character width in bytes instead of assuming ASCII encoding of 1 byte per char.