CVE-2026-40481Public exploitNetwork attack vector

Unauthenticated denial of service via unbounded webhook reads

Published Apr 17, 2026 · Updated Apr 17, 2026

Uncontrolled resource consumption in monetr before 1.12.4 allows remote attackers to crash the service via oversized webhook requests. The public Stripe webhook handler buffers the entire attacker-controlled body in memory before checking its Stripe signature, so invalid requests consume memory in proportion to their size. Exploitation requires Stripe webhooks to be enabled and reachable without an upstream body-size limit; sufficient requests make the API unresponsive or crash its process.

CVSS severity8.2
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in monetr before 1.12.4 allows remote attackers to crash the service via oversized webhook requests. The public Stripe webhook handler buffers the entire attacker-controlled body in memory before checking its Stripe signature, so invalid requests consume memory in proportion to their size. Exploitation requires Stripe webhooks to be enabled and reachable without an upstream body-size limit; sufficient requests make the API unresponsive or crash its process.

The record

CVE
CVE-2026-40481
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
monetr
Product
monetr
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.12.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

monetr · monetrversion=< 1.12.4

Published CVSS scores

8.2GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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