CVE-2020-26309

GHSL-2020-303: Regular Expression Denial of Service (ReDoS) in nope-validator

8.7 HighFix available

Validate.js provides a declarative way of validating javascript objects. Versions 0.11.3 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, it is unknown if any patches are available.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.45%Up 0.4 points since Oct 27, 2024

What each source reports

CVE List Score used 8.7

GHSL-2020-303: Regular Expression Denial of Service (ReDoS) in nope-validator

Record: CVE-2020-26309
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Green
Weakness: CWE-1333
Updated: 2026-11-02

EUVDEUVD-2024-2920 8.7

Record: EUVD-2024-2920
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Green
Updated: 2026-11-03

GitHub AdvisoriesGHSA-3phv-83cj-p8p7 6.6

nope-validator Regular Expression Denial of Service vulnerability

Nope is a JavaScript validator. Versions 0.11.3 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). This vulnerability is fixed in 0.12.1.

Record: GHSA-3phv-83cj-p8p7
CVSS 4.0: 6.6 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
Weakness: CWE-1333
Updated: 2026-11-02

NVD 8.7

Record: CVE-2020-26309
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Green
Weakness: CWE-1333
Updated: 2026-11-02

OSV 8.7

Record: CVE-2020-26309
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Green
Updated: 2026-11-02

OSVGHSA-3phv-83cj-p8p7 6.6

nope-validator Regular Expression Denial of Service vulnerability

Record: GHSA-3phv-83cj-p8p7
CVSS 4.0: 6.6 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
Weakness: CWE-1333
Updated: 2026-11-02

Affected products

ftonato nope-validator

Affected packages

Affected packages
Package	Affected	Fixed
`nope-validator` npm	before 0.12.1	0.12.1

History

History
Recorded	Changed	Sources
Nov 10, 2026	facts
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2020-26309 is a high vulnerability (CVSS 8.7) in Ftonato Nope-validator, published October 26, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in nope-validator 0.12.1.