Next.js is a React framework for building full-stack web applications. From versions 15.0.4-canary.51 to before 15.1.8, a cache poisoning bug leading to a Denial of Service (DoS) condition was found in Next.js. This issue does not impact customers hosted on Vercel. Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page. This issue has been addressed in version 15.1.8.
CVE-2025-49826
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EPSS
- 60.5%
- KEV
- Not listed
Published
July 3, 2025
Last Modified
September 10, 2025
References (4)
- security-advisories@githubhttps://github.com/vercel/next.js/commit/a15b974ed707d63ad4da5b74c1441f5b7b120e93
- security-advisories@githubhttps://github.com/vercel/next.js/releases/tag/v15.1.8
- security-advisories@githubhttps://github.com/vercel/next.js/security/advisories/GHSA-67rr-84xm-4c7r
- security-advisories@githubhttps://vercel.com/changelog/cve-2025-49826
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| next | — | 15.1.8 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 49× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
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Related CVEs(same CWE)
Same CWE
10 shownCWE-444
Frequently asked(5)
What is CVE-2025-49826?
When was CVE-2025-49826 disclosed?
Is CVE-2025-49826 actively exploited?
What is the CVSS score of CVE-2025-49826?
How do I remediate CVE-2025-49826?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-49826
Is Your Infrastructure Affected by CVE-2025-49826?
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