CVE-2026-64646

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.53% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 42.8% of scored records. A rank, not a probability.

NVD base score

6.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Analyzed. NVD last modified this record on 2026-07-29.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-07-27 18:54Z1 MO AGO

Last updated

2026-07-27 20:22Z1 MO AGO

Reserved

2026-07-20

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 6.3)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Weaknesses

• CWE-770Allocation of Resources Without Limits or ThrottlingBase

Data version

5.2

Document digest

afad6656cc4c43f3692d9622af97ceac2f5cf14d9afa167b45e377d5bb7e0372

• github.comhttps://github.com/vercel/next.js/security/advisories/GHSA-4c39-4ccg-62r3x_refsource_CONFIRM
• github.comhttps://github.com/vercel/next.js/commit/57c31f724d746e86a9e8b92aa8be538a922446a4x_refsource_MISC
• github.comhttps://github.com/vercel/next.js/commit/9a4651e754f70b12e397694ffc41f44c3ba8cc17x_refsource_MISC
• github.comhttps://github.com/vercel/next.js/releases/tag/v15.5.21x_refsource_MISC
• github.comhttps://github.com/vercel/next.js/releases/tag/v16.2.11x_refsource_MISC