CVE-2022-42966

Exponential ReDoS in cleo leads to denial of service

5.9 MediumFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.99%Up 0.1 points since Nov 10, 2022

What each source reports

CVE List Score used 5.9

Exponential ReDoS in cleo leads to denial of service

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

Record: CVE-2022-42966
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1333
Updated: 2026-11-02

EUVDEUVD-2022-7199 5.9

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

Record: EUVD-2022-7199
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-2p9h-ccw7-33gf 5.9

cleo is vulnerable to Regular Expression Denial of Service (ReDoS)

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.

Record: GHSA-2p9h-ccw7-33gf
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1333
Updated: 2026-11-02

NVD 5.9

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

Record: CVE-2022-42966
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1333
Updated: 2026-11-02

OSV 5.9

Exponential ReDoS in cleo leads to denial of service

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

Record: CVE-2022-42966
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1333
Updated: 2026-11-02

OSVGHSA-2p9h-ccw7-33gf 5.9

cleo is vulnerable to Regular Expression Denial of Service (ReDoS)

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.

Record: GHSA-2p9h-ccw7-33gf
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1333
Updated: 2026-11-02

OSVPYSEC-2022-43178 7.5

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

Record: PYSEC-2022-43178
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2022-42966 5.9

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

Record: UBUNTU-CVE-2022-42966
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`cleo` PyPI	1.0.0a1 up to 2.0.0	2.0.0
`cleo` PyPI	1.0.0a1 up to 2.0.0, plus listed versions 1.0.01.0.0a21.0.0a31.0.0a41.0.0a5	2.0.0
`cleo` PyPI	before 2.0.0, plus listed versions 0.2.00.2.10.3.00.4.00.4.1 Show 26 moreShow less 0.5.00.6.00.6.10.6.20.6.30.6.40.6.4b10.6.50.6.60.6.70.6.80.7.00.7.10.7.20.7.30.7.40.7.50.7.60.8.00.8.11.0.01.0.0a11.0.0a21.0.0a31.0.0a41.0.0a5	2.0.0
`python-cleo` Ubuntu:22.04:LTS	All versions, plus listed versions 0.8.1-20.8.1-30.8.1-4	None known
`python-cleo` Ubuntu:24.04:LTS	All versions, plus listed versions 2.0.1-52.1.0-12.1.0-2	None known
`python-cleo` Ubuntu:25.10	All versions, plus listed versions 2.2.1-4	None known
`python-cleo` Ubuntu:26.10	All versions, plus listed versions 2.2.1-42.2.1-5	None known
`python-cleo` Ubuntu:26.04:LTS	All versions, plus listed versions 2.2.1-4	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2022-42966 is a medium vulnerability (CVSS 5.9) in Cleo, published November 9, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.99%, the 62nd percentile. Fixed in cleo 2.0.0.

References

Show 5 moreShow less