PatchTheCVECVE-2026-47075: Improper Neutralization of CRLF Sequences vulnerability in benoitc hackney allows HTTP Request Splitting
CVE-2026-47075 is a high-severity flaw (CVSS 7.5) affecting hackney. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Improper Neutralization of CRLF Sequences vulnerability in benoitc hackney allows HTTP Request Splitting. hackney does not percent-encode carriage return (\r) or line feed (\n) characters in the URL query component before constructing the HTTP/1.1 request target. Characters outside the grammar defined in RFC 3986 Section 3.4 must be percent-encoded, but hackney_url:make_url/3 passes the query binary directly without validation or escaping. An att
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.5% (top 59%) |
| CISA exploited list | No |
| Weakness | CWE-93 |
| Published | 2026-05-25 |
| Last modified | 2026-07-24 |
Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-47075?
hackney: upgrade to 4.0.1. Exact commands for each OS are on this page.
Is CVE-2026-47075 being exploited?
CVE-2026-47075 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-47075 affect?
CVE-2026-47075 affects hackney. Severity is high (CVSS 7.5). Improper Neutralization of CRLF Sequences vulnerability in benoitc hackney allows HTTP Request Splitting. hackney does not percent-encode carriage return (\r) or line feed (\n) characters in the URL query component before constructing the H
How urgent is CVE-2026-47075?
Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action
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