In mistune through 2.0.2, support of inline markup is implemented by using regular…
Priority LOW 36CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 3 fixed, 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-1333.
Summary
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.
Why it matters now
EPSS 0.01617 76th percentileScored 2026-11-07
Fix Partial mistune (PyPI): 2.0.3Red Hat: 3 advisoriesRed Hat: 3 fixed, 2 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | mistune (PyPI) | 2.0.0a1 to before 2.0.3 | 2.0.3 | Patch available | GHSA-fw3v-x4f2-v673 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- mistune (PyPI) Vendor— Affected 2.0.0a1 to before 2.0.3 Fixed in 2.0.3 Patch available GHSA-fw3v-x4f2-v673
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:* | up to 2.0.2 | Vulnerable | lepture |
| cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* | 37 | Vulnerable | Fedoraproject |
- cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:* Versions up to 2.0.2 Vulnerable ·lepture
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
Remediation
- Fix · GHSA-fw3v-x4f2-v673 mistune (PyPI) Fixed in 2.0.3 Advisory →
Red Hat 3 advisories
- RHSA-2026:2769 Released 2026-02-17 · Red Hat rating ImportantRed Hat Ceph Storage 7.1 security and bug fix updates
- Red Hat Ceph Storage 7.1 Tools ceph-2:18.2.1-381.el8cp, ceph-2:18.2.1-381.el9cp, ceph-base-2:18.2.1-381.el8cp +47
- RHSA-2026:2737 Released 2026-02-16 · Red Hat rating ImportantRed Hat Ceph Storage
- Red Hat Ceph Storage 8 registry.redhat.io/rhceph/grafana-rhel9, registry.redhat.io/rhceph/rhceph-8-rhel9
- RHSA-2026:2711 Released 2026-02-16 · Red Hat rating ImportantRed Hat Ceph Storage 8.1 security and bug fix update
- Red Hat Ceph Storage 8.1 Tools ceph-2:19.2.1-331.el9cp, ceph-base-2:19.2.1-331.el9cp, ceph-common-2:19.2.1-331.el9cp +31
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ceph Storage 6 | Affected | No fix planned: Will not fix |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat Ceph Storage 7.1 Tools | Fixed | RHSA-2026:2769 |
| Red Hat Ceph Storage 8 | Fixed | RHSA-2026:2737 |
| Red Hat Ceph Storage 8.1 Tools | Fixed | RHSA-2026:2711 |
Not affected: 2 products
- Red Hat Ceph Storage 8
- Red Hat Ceph Storage 8.1 Tools
Timeline
- 2026-10-02 Threatist record created from CVE-2022-34749
- 2026-10-03 Alias added: GHSA-fw3v-x4f2-v673
References
Advisory 3
Other 5
- https://github.com/lepture/mistune/issues/314#issuecomment-1223972386
- https://github.com/lepture/mistune/commit/ca1e7b506850f4e488823fc7338b49a8f9852718
- https://github.com/lepture/mistune
- https://github.com/pypa/advisory-database/tree/main/vulns/mistune/PYSEC-2022-237.yaml
- https://lists.fedoraproject.org/archives/list/[email protected]/message/TQHXITQ2DSBYOILKHXBSBB7PFBPZHF63
Sources
- CVE-2022-34749 · CVE Program
- CVE-2022-34749 · NVD
- FIRST EPSS
- GHSA-fw3v-x4f2-v673 · GitHub Advisory Database · CC BY 4.0
- CVE-2022-34749 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences