TI-2021-07955 Aliases CVE-2021-25948 GHSA-x3wr-v4wx-5qpc

Prototype pollution in expand-hash

MEDIUM 48CWE-1321Published 2021-06-10 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Tampering
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-915.

Summary

Prototype pollution vulnerability in 'expand-hash' versions 0.1.0 through 1.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.

Why it matters now

EPSS 0.03299 88th percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix No fix listed No fixed version in the sources yet

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
—	expand-hash	0.1.0, 0.1.1, 0.2.1, 0.2.2, 1.0.0, 1.0.1	—	No fix listed	CNA
—	expand-hash (npm)	up to 1.0.1	—	No fix listed	GHSA-x3wr-v4wx-5qpc

expand-hash Vendor— Affected 0.1.0, 0.1.1, 0.2.1, 0.2.2, 1.0.0, 1.0.1 Fixed in — No fix listed CNA
expand-hash (npm) Vendor— Affected up to 1.0.1 Fixed in — No fix listed GHSA-x3wr-v4wx-5qpc

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:expand-hash_project:expand-hash::::::::	0.1.0 – 1.0.1	Vulnerable	Expand-hash Project

cpe:2.3:a:expand-hash_project:expand-hash:*:*:*:*:*:*:*:* Versions 0.1.0 – 1.0.1 Vulnerable ·Expand-hash Project

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-25948
2026-10-03 Alias added: GHSA-x3wr-v4wx-5qpc

References

Exploit 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2021-25948

Other 1

https://github.com/doowb/expand-hash

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences