CVE-2026-91080Public exploitNetwork attack vectorHinoki check available

Unauthenticated crash via unbounded request-body read

Published Sep 14, 2026 · Updated Sep 14, 2026

Uncontrolled resource consumption in webhook 2.8.3 allows remote attackers to crash the service via an oversized HTTP request body. hookHandler passes each non-multipart body to ioutil.ReadAll without a size limit before evaluating HMAC, IP, or value trigger rules. Any party that can reach a known hook endpoint can exhaust process memory before authentication, interrupting every command workflow served by that process.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Uncontrolled resource consumption in webhook 2.8.3 allows remote attackers to crash the service via an oversized HTTP request body. hookHandler passes each non-multipart body to ioutil.ReadAll without a size limit before evaluating HMAC, IP, or value trigger rules. Any party that can reach a known hook endpoint can exhaust process memory before authentication, interrupting every command workflow served by that process.

The record

CVE
CVE-2026-91080
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Adnan Hajdarevic
Product
webhook
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 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=0 <=2.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Adnan Hajdarevic · webhookversion=0 <=2.8.3

Published CVSS scores

7.5Upstream vulnerability reportCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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