What’s Vulnerable › Vulnerabilities

CVE-2026-40481: monetr: Unauthenticated Stripe webhook reads attacker-sized request bodies before signature validation

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-17 · updated 2026-06-17
• Weakness: CWE-400

Description

monetr is a budgeting application for recurring expenses. In versions 1.12.3 and below, the public Stripe webhook endpoint buffers the entire request body into memory before validating the Stripe signature. A remote unauthenticated attacker can send oversized POST payloads to cause uncontrolled memory growth, leading to denial of service. The issue affects deployments with Stripe webhooks enabled and is mitigated if an upstream proxy enforces a request body size limit. This issue has been fixed in version 1.12.4.

Affected products

• monetr: before 1.12.4 — fixed in 1.12.4

How to fix

Upgrade to a fixed version: monetr 1.12.4. Check the vendor advisory for mitigations.

References

• https://github.com/monetr/monetr/releases/tag/v1.12.4
• https://github.com/monetr/monetr/security/advisories/GHSA-v7xq-3wx6-fqc2

Get alerted when CVE-2026-40481 or the next vulnerability affects your stack