Vulnerability in Wevm Mppx
CVE-2026-34210
mppx is a TypeScript interface for machine payments protocol. Prior to version 0.4.11, the stripe/charge payment method did not check Stripe's Idempotent-Replayed response header when creating PaymentIntents. An attacker could replay a valid credential containing the same spt token against a new challenge, and the server would accept the replayed Stripe PaymentIntent as a new successful payment without actually charging the customer again. This allowed an attacker to pay once and consume unlimited resources by replaying the credential. This issue has been patched in version 0.4.11.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Wevm Mppx — versions < 0.4.11
Weakness classification (CWE)
References
- github.com/wevm/mppx/security/advisories/GHSA-8mhj-rffc-rcvw (Patch, Vendor Advisory)
- github.com/wevm/mppx/commit/b2b1a0b60506fc71aa80b8a025084949dca1a994 (Patch)
- github.com/wevm/mppx/releases/tag/mppx@0.4.11 (Release Notes)
Frequently asked questions
- What is CVE-2026-34210?
- CVE-2026-34210 is a high-severity vulnerability in Wevm Mppx, classified under Incorrect Comparison. CVSS score: 8.1/10. Published 2026-03-31.
- How severe is CVE-2026-34210?
- High severity. CVSS v3 base score is 8.1 out of 10.