CVE-2026-25047

deepHas vulnerable to Prototype Pollution via constructor.prototype

deepHas provides a test for the existence of a nested object key and optionally returns that key. A prototype pollution vulnerability exists in version 1.0.7 of the deephas npm package that allows an attacker to modify global object behavior. This issue was fixed in version 1.0.8.

Affected

sharpred · deepHas

CVSS v4.0 GITHUB

9.4 CRITICALCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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:X

CVSS v4.0 GitHub

9.4 CRITICALCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS v3.1 NVD

8.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

0.81% chance of exploitation in the next 30 days, 56th percentile

Published

2026-01-29

Updated

2026-02-02

Proof-of-concept exploits (2)

• advisories/GHSA-2733-6c58-pf27
• mbanyamer/deephas-1.0.7-Prototype-Pollution-PoC-CVE-2026-25047-0★ · 2026-01-31

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/52528

Security advisories

• sharpred/deepHas/security/advisories/GHSA-2733-6c58-pf27
• sharpred/deepHas/commit/8097fafd3776c613d8066546653e0d2c7b5fc465

References

• CVE Record
• NVD entry

Related

• CVE-2019-7711
• CVE-2021-41579
• CVE-2023-31059
• CVE-2025-24076
• CVE-2025-24813
• CVE-2025-30397