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.
CVE-2022-34749
HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 33% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EPSS
- 65.0%
- KEV
- Not listed
Published
July 25, 2022
Last Modified
November 21, 2024
References (6)
- cve@mitrehttps://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2
- cve@mitrehttps://github.com/lepture/mistune/releases
- cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQHXITQ2DSBYOILKHXBSBB7PFBPZHF63/
- af854a3a-2127-422b-91ae-364da2661108https://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2
- af854a3a-2127-422b-91ae-364da2661108https://github.com/lepture/mistune/releases
- af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQHXITQ2DSBYOILKHXBSBB7PFBPZHF63/
Vendor Advisories for CVE-2022-34749(3)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:2769Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Ceph Storage 7.1 security and bug fix updates
- RHSA-2026:2737Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Ceph Storage
- RHSA-2026:2711Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Ceph Storage 8.1 security and bug fix update
Patch Availability(3)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | ceph-2:18.2.1-381.el8cp | 2026-02-17 | redhat |
| redhat | ceph-2:19.2.1-331.el9cp | 2026-02-16 | redhat |
| redhat | rhceph/rhceph-8-rhel9:1770630907 | 2026-02-16 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| mistune | 2.0.0 ... 2.0.2 (10 versions) | 2.0.3 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(1)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
Frequently asked(5)
What is CVE-2022-34749?
CVE-2022-34749 is a high vulnerability published on July 25, 2022. 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.
When was CVE-2022-34749 disclosed?
CVE-2022-34749 was first published in the National Vulnerability Database on July 25, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-34749 actively exploited?
CVE-2022-34749 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 65.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-34749?
CVE-2022-34749 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2022-34749?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-34749, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2022-34749
Is Your Infrastructure Affected by CVE-2022-34749?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.