# CVE-2025-57330: web3-core-subscriptions has a Prototype Pollution vulnerability > Attackers can cause denial of service via prototype pollution in the web3-core-subscriptions library by injecting properties into Object.prototype. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 24 Sep 2025 - **Updated:** 29 Sep 2025 - **Also known as:** CLSA-2026-1789040603, CLSA-2026-1792160945, CLSA-2026-1792161432, CLSA-2026-1792161488, CLSA-2026-1792161656, CLSA-2026-1792161673, CLSA-2026-1792161839, CLSA-2026-1792161967, CLSA-2026-1792162003, CLSA-2026-1792162032, CLSA-2026-1792162040, CLSA-2026-1792162059, CLSA-2026-1792162064, CLSA-2026-1792162083, CLSA-2026-1792162107, CLSA-2026-1792162129, CLSA-2026-1792162150, CLSA-2026-1792162153, CLSA-2026-1792162172, CLSA-2026-1792162192, CLSA-2026-1792162195, GHSA-hhf6-3xpg-pggx ## What is CVE-2025-57330? CVE-2025-57330 is a high-severity vulnerability in n/a, published on 24 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description The web3-core-subscriptions is a package designed to manages web3 subscriptions. A Prototype Pollution vulnerability in the attachToObject function of web3-core-subscriptions version 1.10.4 and before allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum consequence. Weakness: CWE-1321 (Improperly Controlled Modification of Object Prototype Attributes) ## Which versions are affected by CVE-2025-57330? 2 open source packages ship an affected version, including web3-core-subscriptions. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `web3-core-subscriptions` | npm | All versions to 2.0.0-alpha.1 | None | | `web3-core-subscriptions` | npm | All versions to 2.0.0-alpha.1 | None | Products: Web3js Web3-Core-Subscriptions. ## How do I fix CVE-2025-57330? Upgrade to a fixed version. ## Is CVE-2025-57330 being exploited? There is no known exploitation of CVE-2025-57330 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2025-57330 and fix it if it is affected. What it is: CVE-2025-57330 is a high-severity vulnerability in n/a, published on 24 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2025-57330 in the wild and no public exploit code. Affected packages and fixed versions: - web3-core-subscriptions (npm): affected all versions up to 2.0.0-alpha.1; no fix listed - web3-core-subscriptions (npm): affected all versions up to 2.0.0-alpha.1; no fix listed 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-2025-57330/ (Markdown: https://insights.sbomify.com/CVE-2025-57330/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2025-57330 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-57330 - OSV: https://osv.dev/vulnerability/CVE-2025-57330 --- From sbomify Insights: https://insights.sbomify.com/CVE-2025-57330/ Summaries are generated and may contain mistakes; the official description above is the record.