# CVE-2026-25047: deepHas vulnerable to Prototype Pollution via constructor.prototype

> An attacker can pollute the prototype in the deepHas npm library, potentially leading to code execution or privilege escalation.

- **Severity:** Critical 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Jan 2026
- **Updated:** 2 Feb 2026
- **Also known as:** GHSA-2733-6c58-pf27

## What is CVE-2026-25047?

CVE-2026-25047 is a critical vulnerability in sharpred deepHas, published on 29 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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.

Weakness: CWE-1321 (Improperly Controlled Modification of Object Prototype Attributes)

## Which versions are affected by CVE-2026-25047?

2 open source packages ship an affected version, including deephas. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `deephas` | npm | All versions | 1.0.8 |
| `deephas` | npm | All versions | 1.0.8 |

Products: Sharpred Deephas.

## How do I fix CVE-2026-25047?

Upgrade deephas to 1.0.8 or later.

## Is CVE-2026-25047 being exploited?

There is no known exploitation of CVE-2026-25047 in the wild and no public exploit code.

Public exploit code:

- https://github.com/mbanyamer/deephas-1.0.7-Prototype-Pollution-PoC-CVE-2026-25047- (github_poc): https://github.com/mbanyamer/deephas-1.0.7-Prototype-Pollution-PoC-CVE-2026-25047-
- deephas 1.0.7 - Prototype Pollution (exploitdb)

## Other vulnerabilities in sharpred deepHas

- [CVE-2020-28271](https://insights.sbomify.com/CVE-2020-28271/): Prototype Pollution in deephas (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-25047 and fix it if it is affected.

What it is: CVE-2026-25047 is a critical vulnerability in sharpred deepHas, published on 29 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-25047 in the wild and no public exploit code.

Affected packages and fixed versions:
- deephas (npm): affected all versions; fixed in 1.0.8
- deephas (npm): affected all versions; fixed in 1.0.8

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-25047/ (Markdown: https://insights.sbomify.com/CVE-2026-25047/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-25047
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-25047
- OSV: https://osv.dev/vulnerability/CVE-2026-25047

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-25047/
Summaries are generated and may contain mistakes; the official description above is the record.