CVE-2026-47075Public exploit

HTTP request splitting via raw query CRLF

Published May 25, 2026 · Updated May 25, 2026

CRLF injection in hackney 0.13.1 through 4.0.0 allows context-dependent attackers to inject HTTP headers or split requests. The hackney_url:make_url/3 routine appends the query binary to the request target without rejecting or percent-encoding carriage returns or line feeds. Exploitation requires attacker-controlled URL content to reach hackney without prior sanitization; injected bytes can alter headers or create a second request to the destination server.

CVSS severity6.8
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CRLF injection in hackney 0.13.1 through 4.0.0 allows context-dependent attackers to inject HTTP headers or split requests. The hackney_url:make_url/3 routine appends the query binary to the request target without rejecting or percent-encoding carriage returns or line feeds. Exploitation requires attacker-controlled URL content to reach hackney without prior sanitization; injected bytes can alter headers or create a second request to the destination server.

The record

CVE
CVE-2026-47075
Published
May 25, 2026
Updated
May 25, 2026
Vendor
Benoit Chesneau
Product
Hackney
Classifications
CWE-93, CAPEC-105
Attack vector
local
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 <4.0.1
  2. Affected versionversion=8bb1a359a81ae58567c84f8d24564e9742e6f2bd <ca73dd0aba0ed557449c18288bf07241671a43c9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Benoit Chesneau · Hackneyversion=0 <4.0.1; version=8bb1a359a81ae58567c84f8d24564e9742e6f2bd <ca73dd0aba0ed557449c18288bf07241671a43c9

Published CVSS scores

6.8Erlang Ecosystem FoundationCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA: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.

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
CAPEC-105HTTP Request Splitting

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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