CVE-2022-34749 Mistune vulnerable to catastrophic backtracking

What is CVE-2022-34749?

CVE-2022-34749 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 25 Jul 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high amount of backtracking on certain edge cases. This behavior is commonly named catastrophic backtracking.

Weakness: CWE-1333

Which versions are affected by CVE-2022-34749?

3 open source packages ship an affected version, including mistune. It affects 2 products.

Products include Fedoraproject Fedora, Mistune Project Mistune.

How do I fix CVE-2022-34749?

Upgrade mistune to 2.0.3 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-34749 being exploited?

There is no known exploitation of CVE-2022-34749 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-10403, DEBIAN-CVE-2022-34749, GHSA-fw3v-x4f2-v673, PYSEC-2022-237, UBUNTU-CVE-2022-34749, openSUSE-SU-2024:12350-1 and 1 more.