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MEDIUM severity

CVE-2026-8769 — @ai-sdk/provider-utils

MEDIUMFix: vercel/ai#16374

CVE-2026-8769 is a medium-severity (CVSS 4.3) Uncontrolled Resource Consumption vulnerability in @ai-sdk/provider-utils. A fix is available for @ai-sdk/provider-utils — see the affected versions and patch details below.

@ai-sdk/provider-utils has an Uncontrolled Resource Consumption issue

Published
May 18, 2026
Updated
Sep 8, 2026
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Sep 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-8769.

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs52th percentile — riskier than 52% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-8769 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 380,526 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

3 pkgs affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

711other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@ai-sdk/provider-utilsnpm
50.3Mdownloads / week

Description

Versions of @ai-sdk/provider-utils before 3.0.28, from 4.0.0 before 4.0.33, and from 5.0.0 before 5.0.1 are vulnerable to uncontrolled resource consumption. The createJsonResponseHandler, createJsonErrorResponseHandler, and createStatusCodeErrorResponseHandler functions in packages/provider-utils/src/response-handler.ts read response bodies without a shared size limit, allowing a remote attacker with low privileges to cause excessive memory consumption. The exploit has been publicly disclosed and may be utilized.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
📦npm@ai-sdk/provider-utilsall versions3.0.28npm install @ai-sdk/provider-utils@3.0.28
📦npm@ai-sdk/provider-utils≥ 4.0.0-beta.10&&< 4.0.334.0.33npm install @ai-sdk/provider-utils@4.0.33
📦npm@ai-sdk/provider-utils≥ 5.0.0-beta.0&&< 5.0.15.0.1npm install @ai-sdk/provider-utils@5.0.1

Affected Products

1 product · 1 configurations
Application
aivercel
≤ 3.0.97
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @ai-sdk/provider-utils, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @ai-sdk/provider-utils to 3.0.28 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-8769 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

Versions of `@ai-sdk/provider-utils` before 3.0.28, from 4.0.0 before 4.0.33, and from 5.0.0 before 5.0.1 are vulnerable to uncontrolled resource consumption. The `createJsonResponseHandler`, `createJsonErrorResponseHandler`, and `createStatusCodeErrorResponseHandler` functions in `packages/provider-utils/src/response-handler.ts` read response bodies without a shared size limit, allowing a remote attacker with low privileges to cause excessive memory consumption. The exploit has been publicly disclosed and may be utilized.
O3 Security · Impact-Aware SCA

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CVE-2026-8769: @ai-sdk/provider-utils | O3 Security