Exponential ReDoS in cleo leads to denial of service
Priority HIGH 66CWE-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
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the cleo PyPI package, when an attacker is able to supply arbitrary input to the Table.set_rows method
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01165 67th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed cleo (cleo): 1.0.0cleo (PyPI): 2.0.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cleo | cleo | before 1.0.0 | 1.0.0 | Patch available | CNA |
| — | cleo (PyPI) | 1.0.0a1 to before 2.0.0 | 2.0.0 | Patch available | GHSA-2p9h-ccw7-33gf |
- cleo VendorCleo Affected before 1.0.0 Fixed in 1.0.0 Patch available CNA
- cleo (PyPI) Vendor— Affected 1.0.0a1 to before 2.0.0 Fixed in 2.0.0 Patch available GHSA-2p9h-ccw7-33gf
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:python-poetry:cleo:*:*:*:*:*:*:*:* | before 2.0.0 | Vulnerable | python-poetry |
- cpe:2.3:a:python-poetry:cleo:*:*:*:*:*:*:*:* Versions before 2.0.0 Vulnerable ·python-poetry
Remediation
- Fix · CNA cleo (cleo) Fixed in 1.0.0
- Fix · GHSA-2p9h-ccw7-33gf cleo (PyPI) Fixed in 2.0.0 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2022-42966
- 2026-10-03 Alias added: GHSA-2p9h-ccw7-33gf
References
Advisory 2
Other 6
- https://github.com/python-poetry/cleo/pull/285
- https://github.com/python-poetry/cleo/commit/b5b9a04d2caf58bf7cf94eb7ae4a1ebbe60ea455
- https://github.com/pypa/advisory-database/tree/main/vulns/cleo/PYSEC-2022-43178.yaml
- https://github.com/python-poetry/cleo
- https://github.com/python-poetry/cleo/releases/tag/2.0.0
- https://research.jfrog.com/vulnerabilities/cleo-redos-xray-257186
More Cleo vulnerabilities
- TI-2024-36997 In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24… KEVCVSS 3.1CRITICAL 9.8
- TI-2024-34043 In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21… KEVCVSS 3.1CRITICAL 9.8
- TI-2026-57837 Cleo Harmony JWT Refresh Token connections privileges management CVSS 4.0MEDIUM 6.9
- TI-2021-12963 An issue was discovered in Cleo LexiCom 5.5.0.0. CVSS 3.1CRITICAL 9.8
- TI-2021-12964 An issue was discovered in Cleo LexiCom 5.5.0.0. CVSS 3.1MEDIUM 5.3
- TI-2026-57836 Cleo Harmony SAML Authentication LocalUserUtil.getNativeUserByAssertions improper authentication CVSS 4.0MEDIUM 5.3
Sources
- CVE-2022-42966 · CVE Program
- CVE-2022-42966 · NVD
- FIRST EPSS
- GHSA-2p9h-ccw7-33gf · GitHub Advisory Database · CC BY 4.0
- CVE-2022-42966 · 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