CVE-2026-50013Public exploitNetwork attack vectorHinoki check available

Unauthenticated process crash via unsynchronized diff map

Published Sep 11, 2026 · Updated Sep 14, 2026

Race condition in Hoverfly before 1.12.8 allows remote attackers to crash the process using concurrent proxy requests in Diff mode. AddDiff reads and appends to the shared responsesDiff map without a mutex, so concurrent request goroutines trigger Go's unrecoverable map-access check. Proxy-port access and Diff mode are required; the failure terminates the entire service without exposing or modifying data.

CVSS severity7.5
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Race condition in Hoverfly before 1.12.8 allows remote attackers to crash the process using concurrent proxy requests in Diff mode. AddDiff reads and appends to the shared responsesDiff map without a mutex, so concurrent request goroutines trigger Go's unrecoverable map-access check. Proxy-port access and Diff mode are required; the failure terminates the entire service without exposing or modifying data.

The record

CVE
CVE-2026-50013
Published
Sep 11, 2026
Updated
Sep 14, 2026
Vendor
SpectoLabs
Product
Hoverfly
Classifications
CWE-362, CWE-820, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 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=< 1.12.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SpectoLabs · Hoverflyversion=< 1.12.8

Published CVSS scores

7.5GitHubCVSS: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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-820Missing Synchronization
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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