[UPDATE] [medium] Vercel Next.js: Multiple vulnerabilities

mediumCVE-2026-27979 CVE-2026-27980 CVE-2026-29057 CVE-2026-27977 CVE-2026-27978

A remote, anonymous attacker can exploit multiple vulnerabilities in Vercel Next.js to carry out a denial of service attack or bypass security measures.

CSIRTS triage

vendor: Vercel product: Next.js Denial of service Authentication bypass

What: Multiple vulnerabilities can be exploited by a remote attacker to carry out denial of service attacks or bypass security measures.
Who is affected: Deployments of Vercel Next.js are affected by these vulnerabilities.
Urgency: Remediation is medium urgency due to the potential impact of the vulnerabilities.
Action: Update to the latest version of Vercel Next.js to address these issues.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-02
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0748

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-279790.67% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-279800.68% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 50% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-290570.43% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-279770.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-279780.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-27979	coverage & exploitation status	NVD · CVE.org
CVE-2026-27980	coverage & exploitation status	NVD · CVE.org
CVE-2026-29057	coverage & exploitation status	NVD · CVE.org
CVE-2026-27977	coverage & exploitation status	NVD · CVE.org
CVE-2026-27978	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownMultiple vulnerabilities in IBM products (July 17, 2026)cert-fr-avis

Recent advisories for Vercel Next.js

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] Vercel Next.js: Multiple Vulnerabilitiescert-bund · 2026-08-13
high[UPDATE] [high] Vercel Next.js: Multiple vulnerabilitiescert-bund · 2026-08-13
medium[UPDATE] [medium] Vercel Next.js: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-02