CVE-2025-59039
CVE-2025-59039 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-506.
Key facts
- Severity: Critical (CVSS 4.0 base score 9.3)
- EPSS exploit prediction: 0% (23rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-27597
- Weakness: CWE-506
- Published:
- Last modified:
Description
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 The maintainers of PUC unpublished version 1.17.3.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.
Frequently asked questions
- What is CVE-2025-59039?
- 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 The maintainers of PUC unpublished version 1.17.3.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.
- How severe is CVE-2025-59039?
- CVE-2025-59039 has a CVSS 4.0 base score of 9.3, rated critical severity.
- Is CVE-2025-59039 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-59039?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-59039 have an EU (EUVD) identifier?
- Yes. CVE-2025-59039 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27597.
- When was CVE-2025-59039 published?
- CVE-2025-59039 was published on 2025-09-09 and last updated on 2026-06-17.
References
- https://github.com/prebid/prebid-universal-creative/security/advisories/GHSA-m662-56rj-8fmm
- https://www.sonatype.com/blog/npm-chalk-and-debug-packages-hit-in-software-supply-chain-attack
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