CVE-2025-1211: Hackney Server-side Request Forgery (SSRF) Vulnerability

LOW
Advisory Identifier: GHSA-vq52-99r9-h5pw
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CVSS 6.5
CWE-918
Published
Advisory Summary

CVE-2025-1211 is a LOW (CVSS 6.5) server-side request forgery (ssrf) vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Hackney libraries in the Hex ecosystem. The issue involves server-side request forgery (ssrf) in hackney. Remediation is available by upgrading affected packages to version 1.21.0.

CVE-2025-1211 at a Glance

CVE Identifier CVE-2025-1211
GHSA Identifier GHSA-vq52-99r9-h5pw
Severity LOW
CVSS v3.1 Base Score 6.5
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Hackney
Package Ecosystem Hex
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2025-1211

To remediate this vulnerability, upgrade all affected Hackney dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

hackney fixed: 1.21.0 
Upgrade hackney to 1.21.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for hackney

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-1211, inspect your project dependencies for Hackney:

inspect dependencies for hackney

Analyze the terminal output to locate any version of Hackney in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.21.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Hackney, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Versions of the package hackney from 0.0.0 are vulnerable to Server-side Request Forgery (SSRF) due to improper parsing of URLs by URI built-in module and hackey. Given the URL http://127.0.0.1?@127.2.2.2/, the URI function will parse and see the host as 127.0.0.1 (which is correct), and hackney will refer the host as 127.2.2.2/. This vulnerability can be exploited when users rely on the URL function for host checking.

CVE-2025-1211 Affected Hackney Versions

1 component(s)
Fixed Versions:
1.21.0
Product / Package Ecosystem Affected Versions Fixed Version
hackney
 Hex
< 1.21.0
1.21.0

References

NVD — CVE-2025-1211 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-1211
Security Fix Commit FIX COMMIT
https://github.com/benoitc/hackney/commit/9594ce58fabd32cd897fc28fae937694515a3d4a
Hackney Source Repository REPOSITORY
https://gist.github.com/snoopysecurity/996de09ec0cfd0ebdcfdda8ff515deb1
Hackney Source Repository REPOSITORY
https://github.com/benoitc/hackney
Hackney Release RELEASE
https://github.com/benoitc/hackney/releases/tag/1.21.0
Hackney Security Information SECURITY
https://security.snyk.io/vuln/SNYK-HEX-HACKNEY-6516131
www.blackhat.com/docs/us-17/thursday... WEB
https://www.blackhat.com/docs/us-17/thursday/us-17-Tsai-A-New-Era-Of-SSRF-Exploiting-URL-Parser-In-Trending-Programming-Languages.pdf

Frequently Asked Questions

What is CVE-2025-1211?
CVE-2025-1211 is a security vulnerability in Hackney involving Server-side Request Forgery (SSRF) in hackney under CWE-918: Server-Side Request Forgery (SSRF).
Which Hackney versions are affected?
Affected versions include releases prior to 1.21.0 across affected packages: hackney.
What version fixes CVE-2025-1211?
Upgrading to 1.21.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is hackney affected?
Yes, hackney is affected in releases prior to 1.21.0. Upgrade your dependency to 1.21.0 or later.
What is the CVSS score of CVE-2025-1211?
CVE-2025-1211 has a CVSS v3.1 base score of 6.5 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L.
What CWE is associated with CVE-2025-1211?
CVE-2025-1211 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Hex dependencies for CVE-2025-1211?
Run the dependency tree command: 'inspect dependencies for hackney'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vq52-99r9-h5pw",
  "modified" : "2025-02-20T16:41:45Z",
  "published" : "2025-02-11T06:30:27Z",
  "aliases" : [ "CVE-2025-1211" ],
  "summary" : "Server-side Request Forgery (SSRF) in hackney",
  "details" : "Versions of the package hackney from 0.0.0 are vulnerable to Server-side Request Forgery (SSRF) due to improper parsing of URLs by URI built-in module and hackey. Given the URL http://127.0.0.1?@127.2.2.2/, the URI function will parse and see the host as 127.0.0.1 (which is correct), and hackney will refer the host as 127.2.2.2/. This vulnerability can be exploited when users rely on the URL function for host checking.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:L/SA:L/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Hex",
      "name" : "hackney"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.21.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-1211"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/benoitc/hackney/commit/9594ce58fabd32cd897fc28fae937694515a3d4a"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/snoopysecurity/996de09ec0cfd0ebdcfdda8ff515deb1"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/benoitc/hackney"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/benoitc/hackney/releases/tag/1.21.0"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-HEX-HACKNEY-6516131"
  }, {
    "type" : "WEB",
    "url" : "https://www.blackhat.com/docs/us-17/thursday/us-17-Tsai-A-New-Era-Of-SSRF-Exploiting-URL-Parser-In-Trending-Programming-Languages.pdf"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-02-11T17:59:52Z",
    "nvd_published_at" : "2025-02-11T05:15:14Z"
  }
}