CVE-2022-24713

Aliases:GHSA-m5pq-gvj9-9vr8RUSTSEC-2022-0013
Advisory lineage Upstream: 0 Downstream: 53
Modified
Published: 08 Mar 2022, 19:00
Last modified:23 Apr 2025, 18:58

Vulnerability Summary

Overall Risk (default)
medium
32/100
CVSS Score
7.5 HIGH
v3.1 (cve.org)
EPSS Score
10.4% MEDIUM
10% probability +3.86%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

08 Mar 2022, 19:00
Published
Vulnerability first disclosed
23 Apr 2025, 18:58
Last Modified
Vulnerability information updated

Description

regex is an implementation of regular expressions for the Rust language. The regex crate features built-in mitigations to prevent denial of service attacks caused by untrusted regexes, or untrusted input matched by trusted regexes. Those (tunable) mitigations already provide sane defaults to prevent attacks. This guarantee is documented and it's considered part of the crate's API. Unfortunately a bug was discovered in the mitigations designed to prevent untrusted regexes to take an arbitrary amount of time during parsing, and it's possible to craft regexes that bypass such mitigations. This makes it possible to perform denial of service attacks by sending specially crafted regexes to services accepting user-controlled, untrusted regexes. All versions of the regex crate before or equal to 1.5.4 are affected by this issue. The fix is include starting from regex 1.5.5. All users accepting user-controlled regexes are recommended to upgrade immediately to the latest version of the regex crate. Unfortunately there is no fixed set of problematic regexes, as there are practically infinite regexes that could be crafted to exploit this vulnerability. Because of this, it us not recommend to deny known problematic regexes.

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v2.0•MEDIUM•Score: 5AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 10.40%• Percentile: 93%

Techniques & Countermeasures

  • CWE-400•Uncontrolled Resource Consumption

    The product does not properly control the allocation and maintenance of a limited resource.

  • CWE-1333•Inefficient Regular Expression Complexity

    The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

Affected Systems

  • Crates.Io•regex

    < 1.5.5 | ≥ 0.0.0-0, < 1.5.5

  • debian•debian_linux

    9.0 | 10.0 | 11.0

  • fedoraproject•fedora

    34 | 35 | 36

  • rust-lang•regex

    < 1.5.5

References (19)