deepHas vulnerable to Prototype Pollution via constructor.prototype

published 2026-01-29 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-4946 , GHSA-2733-6c58-pf27

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits: 1; Exploit-DB

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.

Patch / fix

fixed in 3 links 1

npm deephas 1.0.8
deephas_project deephas 1.0.7
sharpred deephas 1.0.7

github.com/sharpred/deepHas@8097faf commit

Timeline

2026-01-29 Published
2026-04-30 First public exploit (EDB-52528)

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 9 mo ago (2026-01-30)

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-52528 deephas 1.0.7 - Prototype Pollution webapps, 2026-04-30
github.com https://github.com/sharpred/deepHas/security/advisories/GHSA-2733-6c58-pf27 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.4	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CNA	4.0	9.4	CVSS: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
NVD	3.1	8.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	deephas	<1.0.8	1.0.8

Affected products

sharpred deepHas

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

github.com /sharpred/deepHas/commit/8097fafd3776c613d8066546653e0d2c7b5fc465
web, patch
github.com /sharpred/deepHas/security/advisories/GHSA-2733-6c58-pf27
web, exploit, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-25047
advisory
github.com /sharpred/deepHas
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary