CVE-2025-48985Network attack vectorHinoki check available

Arbitrary file injection via download index misalignment

Published Nov 7, 2025 · Updated Nov 7, 2025

Input validation bypass in Vercel AI SDK 5.0.51 and 5.1.0-beta.8 allows remote attackers to inject arbitrary file content via mixed URLs. The downloadAssets function filters failed downloads before pairing remaining data with plannedDownloads by index, associating bytes from one URL with another. Applications using generateText() or streamText() on mixed supported and unsupported URLs without external validation allow URL-based trust checks to be bypassed.

CVSS severity3.7
Low
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Input validation bypass in Vercel AI SDK 5.0.51 and 5.1.0-beta.8 allows remote attackers to inject arbitrary file content via mixed URLs. The downloadAssets function filters failed downloads before pairing remaining data with plannedDownloads by index, associating bytes from one URL with another. Applications using generateText() or streamText() on mixed supported and unsupported URLs without external validation allow URL-based trust checks to be bypassed.

The record

CVE
CVE-2025-48985
Published
Nov 7, 2025
Updated
Nov 7, 2025
Vendor
Vercel
Product
AI SDK
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 2025Record 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=5.0.51 <=5.0.51
  2. Affected versionversion=5.1.0-beta.8 <=5.1.0-beta.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vercel · AI SDKversion=5.0.51 <=5.0.51; version=5.1.0-beta.8 <=5.1.0-beta.8

Published CVSS scores

5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.7HackerOneCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A: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-20Improper Input Validation
T1190Exploit Public-Facing Application

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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