CVE-2026-47072

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 61% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in benoitc hackney allows HTTP Request/Response Splitting. The WebSocket upgrade code in src/hackney_ws.erl copies the host, path, headers (ExtraHeaders), and protocols options from the caller-supplied opts map into the internal #ws_data{} record in init/1 and then splices them verbatim into the raw HTTP/1.1 upgrade request by binary concatenation in do_handshake/1. No CRLF or NUL stripping is performed at any of these four injection sites. An attacker who controls any of these options — for example by forwarding URL components or header values from untrusted input into hackney_ws:start_link/1 — can inject arbitrary HTTP headers into the outbound WebSocket upgrade request, leading to header injection, credential spoofing toward the upstream server, log and cache poisoning, or request smuggling via intermediary proxies.

This issue affects hackney: from 2.0.0 before 4.0.1.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
39.8%
KEV
Not listed

Published

May 25, 2026

Last Modified

May 28, 2026

Advisory Details (4)

Auto-updated May 29, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

CRLF / header injection in WebSocket upgrade request · Advisory · benoitc/hackney · GitHub

https://github.com/benoitc/hackney/security/advisories/GHSA-f9vr-g2g2-x9fg
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-47072
github_commit Patch Available

commit 52310ca807e7 (benoitc/hackney)

Patch available: benoitc/hackney 4.0.1 (contains commit 52310ca807e7)

https://github.com/benoitc/hackney/commit/52310ca807e7b48441ba0e9129171f535313fdd1
generic

CRLF injection in WebSocket upgrade request in hackney | Erlang Ecosystem Foundation CNA

https://cna.erlef.org/cves/CVE-2026-47072.html

Vendor Advisories for CVE-2026-47072(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Hex(1)
PackageVulnerable rangeFixed inDependents
hackney2.0.0 ... 4.0.0 (12 versions)4.0.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 113 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-47072?
CVE-2026-47072 is a high vulnerability published on May 25, 2026. Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in benoitc hackney allows HTTP Request/Response Splitting. The WebSocket upgrade code in src/hackneyws.erl copies the host, path, headers (ExtraHeaders), and protocols options from the caller-supplied opts map into the…
When was CVE-2026-47072 disclosed?
CVE-2026-47072 was first published in the National Vulnerability Database on May 25, 2026, with the most recent update on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47072 actively exploited?
CVE-2026-47072 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47072?
CVE-2026-47072 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-47072?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47072, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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