CVE-2021-25948
Prototype Pollution
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.
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
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-25948- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-1321
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-25948- Updated
- 2026-11-02
EUVDEUVD-2021-1422 No score
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.
- Record
EUVD-2021-1422- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-x3wr-v4wx-5qpc
Prototype Pollution
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.
- Record
GHSA-x3wr-v4wx-5qpc- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-915, CWE-1321
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-25948- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-x3wr-v4wx-5qpc
Prototype Pollution
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.
- Record
GHSA-x3wr-v4wx-5qpc- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-1321, CWE-915
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
expand-hashnpm |
through 1.0.1 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-25948 is a critical vulnerability (CVSS 9.8) in Expand-hash Project Expand-hash, published June 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.30%, the 88th percentile. No source names a fixed version.