CVE-2026-44479 — vercel
MEDIUMCVE-2026-44479 is a medium-severity (CVSS 5.5) Information Exposure vulnerability in vercel. A fix is available for vercel — see the affected versions and patch details below.
Vercel: Non-interactive mode includes CLI arguments in suggested command output
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-44479.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2026-44479 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,156 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
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.
vercelnpmDescription
Summary
When the Vercel CLI runs in non-interactive mode (--non-interactive or auto-detected AI agent), commands that cannot complete autonomously emit JSON payloads with suggested follow-up commands. If the user authenticated via --token or -t on the command line, the token value is included verbatim in those suggestions.
Conditions
All three must be true for the token to appear in output:
- Token passed as a CLI argument (
--token/-t). TheVERCEL_TOKENenvironment variable is not affected. - Non-interactive mode is active (explicit flag or AI agent auto-detection).
- The command cannot complete on its own (e.g. missing
--yes, ambiguous scope, API errors). Successful commands produce no suggestion output.
Impact
The plaintext token may be captured in CI/CD logs, agent transcripts, or other automation output.
Remediation
- Upgrade to the patched version.
- If developers have previously used
--tokenwith--non-interactivein their applications, review logs for exposed tokens and rotate them. - Prefer
VERCEL_TOKENenvironment variable for authentication.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | vercel | ≥ 50.16.0&&< 52.0.1 | 52.0.1npm install vercel@52.0.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for vercel, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update vercel to 52.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-44479 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-44479 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-44479. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2026-44479 in your dependencies?
O3 Security finds CVE-2026-44479 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.