CVE-2022-34749: fedoraproject fedora
Vulnerability summary
CVE-2022-34749 is a high (CVSS 7.5) vulnerability in fedoraproject fedora. EPSS estimates a 1.62% chance of exploitation in the next 30 days, higher than 76% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2Timeline
- 25-07-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · PypiEcosystem advisory · calculated8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.62%
Chance of exploitation in the next 30 days
Percentile
76%
Versus all other CVEs
30-day change
Increase +0.09 pp
From 1.53% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- py3-mistune< 2.0.3-r0
Debian1 product
- mistune< 2.0.3-1
Fedoraproject1 product
- fedoraEOL37
Mistune_project1 product
- mistune≤ 2.0.2
Opensuse1 product
- python-mistune&distro=openSUSE Tumbleweed< 3.1.0-1.1
PyPI1 product
- mistune< a6d43215132fe4f3d93f8d7e90ba83b16a0838b2 | ≥ 2.0.0a1, < 2.0.3
Ubuntu1 product
- mistuneAll versions (No fix recorded)
7 vendors · 7 products
References
16 links- github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2WEBFIXREPORTPatchThird Party Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- github.com/lepture/mistunePACKAGE
Show all 16 references
- lists.opensuse.org/archives/…Advisory