PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-8769 vercel CVE debrief

A vulnerability in Vercel AI SDK versions up to 3.0.97 allows remote attackers to cause resource consumption through the createJsonResponseHandler and createJsonErrorResponseHandler functions in packages/provider-utils/src/response-handler.ts. The issue was publicly disclosed on 2026-05-17 with an exploit available, and the vendor was reportedly contacted but did not respond. The vulnerability is rated LOW severity (CVSS 4.0: 2.1) with network attack vector, low attack complexity, and low availability impact. No known ransomware campaign use or CISA KEV listing exists.

Vendor
vercel
Product
ai
CVSS
LOW 2.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-17
Original CVE updated
2026-05-19
Advisory published
2026-05-17
Advisory updated
2026-05-19

Who should care

Organizations using Vercel AI SDK versions 3.0.97 or earlier in production applications, particularly those exposing AI provider integrations to untrusted network input. Development teams implementing custom AI provider handlers based on the SDK's response handling utilities.

Technical summary

The vulnerability exists in the createJsonResponseHandler and createJsonErrorResponseHandler functions within packages/provider-utils/src/response-handler.ts of the Vercel AI SDK. These functions improperly handle resource consumption, potentially allowing remote attackers to exhaust system resources. The attack requires low privileges and no user interaction, with network-based exploitation possible. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L - changed from N in base), and low availability impact (VA:L).

Defensive priority

low

Recommended defensive actions

  • Upgrade Vercel AI SDK to a version newer than 3.0.97 when available
  • Monitor provider-utils package for security patches
  • Review application resource limits and implement timeout controls for AI provider responses
  • Consider input validation and response size limits for JSON response handling
  • Monitor for unusual resource consumption patterns in AI SDK integrations

Evidence notes

Vulnerability affects Vercel AI SDK ≤3.0.97 in provider-utils component. CWE-400 (Uncontrolled Resource Consumption) and CWE-404 (Improper Resource Shutdown or Release) identified. Public exploit disclosed via GitHub Gist. Vendor non-responsive to disclosure.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8769 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8769

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-8769 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8769

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.