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EUVD-2026-233949

fkie_cve-2022-31099

rulex is a new, portable, regular expression language. When parsing untrusted rulex expressions, the stack may overflow, possibly enabling a Denial of Service attack. This happens when parsing an expression with several hundred levels of nesting, causing the process to abort immediately. 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 process running rulex aborts due to a stack overflow. The crash is fixed in version **0.4.3**. Affected users are advised to update to this version. There are no known workarounds for this issue.

GHSA-v78m-2q7v-fjqp — Uncontrolled Recursion in rulex

Affected: crates.io: rulex

### Impact When parsing untrusted rulex expressions, the stack may overflow, possibly enabling a Denial of Service attack. This happens when parsing an expression with several hundred levels of nesting, causing the process to abort immediately.

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 process running rulex aborts due to a stack overflow.

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

### Workarounds None.

### 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

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

gsd-2022-31099

RUSTSEC-2022-0030 — Stack overflow during recursive expression parsing

Affected: crates.io: rulex

When parsing untrusted rulex expressions, the stack may overflow, possibly enabling a Denial of Service attack. This happens when parsing an expression with several hundred levels of nesting, causing the process to abort immediately.

The flaw was corrected in commits `60aa2dc03a` by adding a check to recursion depth.