CVE-2026-47069 json
CRLF injection in cookie domain/path options in hackney
published 2026-05-25 5 mo ago modified 2026-07-30 3 mo ago also EEF-CVE-2026-47069 , EUVD-2026-31683 , GHSA-mp55-p8c9-rfw2
- cvss
- 5.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 37%
- public exploits
- 0
- none known
Summary
Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in benoitc hackney allows HTTP Response Splitting. The hackney_cookie:setcookie/3 function in src/hackney_cookie.erl validates the Name and Value arguments against CRLF and control characters, but concatenates the domain and path options verbatim into the output iolist with no equivalent check. An attacker who controls either option — for example by supplying a Host header value forwarded as the cookie domain, or a request path forwarded as the cookie path — can inject a literal CRLF sequence and arbitrary additional Set-Cookie headers into the HTTP response.
This issue affects hackney: from 0.9.0 before 4.0.1.
Patch / fix
- hex hackney 4.0.1
- benoitc hackney 4.0.1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/benoitc/hackney/security/advisories/GHSA-mp55-p8c9-rfw2 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 2.1 | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N |
| CNA | 4.0 | 2.1 | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| hex | hackney | >=0.9.0, <4.0.1 |
4.0.1 |
Affected products
- benoitc hackney
Classification
- Weakness
-
- CWE-93 Improper Neutralization of CRLF Sequences
References
-
github.com
/benoitc/hackney/commit/8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac540
patch, web
-
github.com
/benoitc/hackney/security/advisories/GHSA-mp55-p8c9-rfw2
vendor-advisory, related, exploit, web, patch, advisory
-
cna.erlef.org
/cves/CVE-2026-47069.html
related, web, patch, third-party-advisory
-
osv.dev
/vulnerability/EEF-CVE-2026-47069
related, web, patch, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-47069
advisory
-
github.com
/benoitc/hackney
package
-
hex.pm
/packages/hackney
package
Sources
- CVE List CVE-2026-47069
- GitHub Advisory GHSA-mp55-p8c9-rfw2
- NVD CVE-2026-47069
- OSV EEF-CVE-2026-47069
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.