CVE-2026-47076Public exploitNetwork attack vector

SSRF allowlist bypass via percent-encoded host

Published May 25, 2026 · Updated May 25, 2026

SSRF in Benoit Chesneau hackney 0.13.0 through 4.0.0 allows remote attackers to reach internal services through crafted URLs. hackney_url:normalize/2 decodes a percent-encoded host after caller-side validation, converting a permitted non-IP token into the connection's IP address. Exploitation requires a consuming application to pass attacker-supplied URLs, after which loopback, private-network, or cloud metadata endpoints become reachable.

CVSS severity6.9
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Benoit Chesneau hackney 0.13.0 through 4.0.0 allows remote attackers to reach internal services through crafted URLs. hackney_url:normalize/2 decodes a percent-encoded host after caller-side validation, converting a permitted non-IP token into the connection's IP address. Exploitation requires a consuming application to pass attacker-supplied URLs, after which loopback, private-network, or cloud metadata endpoints become reachable.

The record

CVE
CVE-2026-47076
Published
May 25, 2026
Updated
May 25, 2026
Vendor
Benoit Chesneau
Product
Hackney
Classifications
CWE-436, CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 25, 2026CVE publishedPublication date reported by the CVE source.
  2. May 25, 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=0.13.0 <4.0.1
  2. Affected versionversion=4d725507588942fd00efca15b86da3273656510a <452620a92ec1da2e6b4862a049a2a4f04b42068f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Benoit Chesneau · Hackneyversion=0.13.0 <4.0.1; version=4d725507588942fd00efca15b86da3273656510a <452620a92ec1da2e6b4862a049a2a4f04b42068f

Published CVSS scores

6.9EEFCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
6.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-436Interpretation Conflict
CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

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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