CVE-2026-64644Network attack vector

Service interruption via expensive SVG metadata parsing

Published Jul 27, 2026 · Updated Jul 27, 2026

Inefficient image processing in Next.js 15.5.0 through 15.5.20 and 16.0.0 through 16.2.10 allows remote attackers to exhaust CPU. The /_next/image handler's detectContentType function passes an unrecognized remote image buffer to Sharp metadata parsing, allowing a crafted SVG to consume excessive processor time. Exploitation requires a self-hosted deployment using the default image loader with an affected images.remotePatterns entry; Vercel hosting, unoptimized images, and custom loaders are outside scope.

CVSS severity6.3
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inefficient image processing in Next.js 15.5.0 through 15.5.20 and 16.0.0 through 16.2.10 allows remote attackers to exhaust CPU. The /_next/image handler's detectContentType function passes an unrecognized remote image buffer to Sharp metadata parsing, allowing a crafted SVG to consume excessive processor time. Exploitation requires a self-hosted deployment using the default image loader with an affected images.remotePatterns entry; Vercel hosting, unoptimized images, and custom loaders are outside scope.

The record

CVE
CVE-2026-64644
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Vercel
Product
Next.js
Classifications
CWE-407, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 15.5.0, < 15.5.21
  2. Affected versionversion=>= 16.0.0, < 16.2.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vercel · Next.jsversion=>= 15.5.0, < 15.5.21; version=>= 16.0.0, < 16.2.11

Published CVSS scores

6.3GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-407Inefficient Algorithmic Complexity
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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