---
title: "CVE-2025-59039: Prebid-universal-creative latest on npm briefly compromised"
url: https://erroneo.us/security/cve/CVE-2025-59039/
description: "CVE-2025-59039 (prebid-universal-creative (npm)): Prebid Universal Creative (PUC) is a JavaScript API to render multiple formats. Npm users of PUC 1.17.3 or…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-09-09
date_modified: 2025-09-11
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-59039"
kev: false
cvss: 9.3
epss: 0.00335
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-59039: Prebid-universal-creative latest on npm briefly compromised

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.3% , percentile 26: FIRST’s model estimates a 0.3% chance of exploitation activity in the next 30 days, higher than 26% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes prebid-universal-creative (npm) = 1.17.3, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

Prebid Universal Creative (PUC) is a JavaScript API to render multiple formats. Npm users of PUC 1.17.3 or PUC latest were briefly affected by crypto-related malware. This includes the extremely popular jsdelivr hosting of this file. The maintainers of PUC unpublished version 1.17.3. Users should see Prebid.js 9 release notes for suggestions on moving off the deprecated workflow of using the PUC or pointing to a dynamic version of it. PUC users pointing to latest should transition to 1.17.2 as soon as possible to avoid similar attacks in the future.

## Affected packages

- npm `prebid-universal-creative` = 1.17.3 → fixed: none listed

## Affected products (CVE record)

- prebid prebid-universal-creative: = 1.17.3

## Severity

- GitHub_M CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.34% probability of exploitation activity in the next 30 days; percentile 26.

## Sources

- [GitHub Advisory GHSA-m662-56rj-8fmm](https://github.com/advisories/GHSA-m662-56rj-8fmm)
- [CVE.org record CVE-2025-59039](https://www.cve.org/CVERecord?id=CVE-2025-59039)
- [NVD entry CVE-2025-59039](https://nvd.nist.gov/vuln/detail/CVE-2025-59039)
- [github.com](https://github.com/prebid/prebid-universal-creative/security/advisories/GHSA-m662-56rj-8fmm)
- [sonatype.com](https://www.sonatype.com/blog/npm-chalk-and-debug-packages-hit-in-software-supply-chain-attack)

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Source page: https://erroneo.us/security/cve/CVE-2025-59039/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt