```toml
[advisory]
id = "RUSTSEC-2021-0041"
aliases = ["CAN-2021-1000007", "CVE-2021-29932", "GHSA-qpgv-g792-wh6x"]
cvss = "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
package = "parse_duration"
date = "2021-03-18"
url = "https://github.com/zeta12ti/parse_duration/issues/21"
categories = ["denial-of-service"]
keywords = ["parsing", "untrusted data"]

[versions]
patched = []
unaffected = []

[affected.functions]
"parse_duration::parse" = ["*"]
```

# Denial of service through parsing payloads with too big exponent

The `parse_duration::parse` function allows for parsing duration strings with exponents like `5e5s` where under the hood, the [`BigInt` type along with the `pow` function are used for such payloads](https://github.com/zeta12ti/parse_duration/blob/26940ab5cd4e3a9d6bd97aa101f8d4bbfd18ee8c/src/parse.rs#L335). Passing an arbitrarily big exponent makes the `parse_duration::parse` function to process the payload for a very long time taking up CPU and memory.

This allows an attacker to cause a DoS if the `parse_duration::parse` function is used to process untrusted input.