GHSA-wjfc-pgfp-pv9c: Nyholm/psr7 Improper Input Validation Vulnerability

MODERATE
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CVSS 5.3
CWE-436
Published
Advisory Summary

GHSA-wjfc-pgfp-pv9c is a MODERATE (CVSS 5.3) improper input validation vulnerability (CWE-436: Interpretation Conflict) affecting Nyholm/psr7 libraries in the Packagist ecosystem. The issue involves improper input validation in nyholm/psr7. Remediation is available by upgrading affected packages to version 1.6.1.

GHSA-wjfc-pgfp-pv9c at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-wjfc-pgfp-pv9c
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-436: Interpretation Conflict
Affected Product Nyholm/psr7
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

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

How to Fix GHSA-wjfc-pgfp-pv9c

To remediate this vulnerability, upgrade all affected Nyholm/psr7 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

nyholm/psr7 fixed: 1.6.1 
Upgrade nyholm/psr7 to 1.6.1
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 nyholm/psr7

How to Check if You Are Affected

To determine whether your application is affected by GHSA-wjfc-pgfp-pv9c, inspect your project dependencies for Nyholm/psr7:

inspect dependencies for nyholm/psr7

Analyze the terminal output to locate any version of Nyholm/psr7 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.6.1), 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-436: Interpretation Conflict, where product a handles inputs or steps differently than product b, which causes a to perform incorrect actions based on its perception of b's state. In Nyholm/psr7, 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

### Impact Improper header parsing. An attacker could sneak in a newline (`\n`) into both the header names and values. While the specification states that `\r\n\r\n` is used to terminate the header list, many servers in the wild will also accept `\n\n`. ### Patches The issue is patched in 1.6.1. ### Workarounds There are no known workarounds. ### References * https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4

GHSA-wjfc-pgfp-pv9c Affected Nyholm/psr7 Versions

1 component(s)
Fixed Versions:
1.6.1
Product / Package Ecosystem Affected Versions Fixed Version
nyholm/psr7
 Packagist
< 1.6.1
1.6.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/Nyholm/psr7/security/advisories/GHSA-wjfc-pgfp-pv9c
GitHub Advisory / Wiki ADVISORY
https://github.com/guzzle/psr7/security/advisories/GHSA-q7rv-6hp3-vh96
GitHub Advisory / Wiki ADVISORY
https://github.com/guzzle/psr7/security/advisories/GHSA-wxmh-65f7-jcvw
NVD — GHSA-wjfc-pgfp-pv9c NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-29197
Nyholm/psr7 Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/nyholm/psr7/2023-04-17.yaml
Nyholm/psr7 Source Repository REPOSITORY
https://github.com/Nyholm/psr7

Frequently Asked Questions

What is GHSA-wjfc-pgfp-pv9c?
GHSA-wjfc-pgfp-pv9c is a security vulnerability in Nyholm/psr7 involving Improper Input Validation in nyholm/psr7 under CWE-436: Interpretation Conflict.
Which Nyholm/psr7 versions are affected?
Affected versions include releases prior to 1.6.1 across affected packages: nyholm/psr7.
What version fixes GHSA-wjfc-pgfp-pv9c?
Upgrading to 1.6.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is nyholm/psr7 affected?
Yes, nyholm/psr7 is affected in releases prior to 1.6.1. Upgrade your dependency to 1.6.1 or later.
What is the CVSS score of GHSA-wjfc-pgfp-pv9c?
GHSA-wjfc-pgfp-pv9c has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with GHSA-wjfc-pgfp-pv9c?
GHSA-wjfc-pgfp-pv9c is classified under CWE-436: Interpretation Conflict (Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.).
How can I check Packagist dependencies for GHSA-wjfc-pgfp-pv9c?
Run the dependency tree command: 'inspect dependencies for nyholm/psr7'. 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-wjfc-pgfp-pv9c",
  "modified" : "2023-04-21T20:27:30Z",
  "published" : "2023-04-21T20:27:30Z",
  "aliases" : [ ],
  "summary" : "Improper Input Validation in nyholm/psr7",
  "details" : "### Impact\n\nImproper header parsing. An attacker could sneak in a newline (`\\n`) into both the header names and values. While the specification states that `\\r\\n\\r\\n` is used to terminate the header list, many servers in the wild will also accept `\\n\\n`.\n\n### Patches\n\nThe issue is patched in 1.6.1.\n\n### Workarounds\n\nThere are no known workarounds.\n\n### References\n\n* https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "nyholm/psr7"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.6.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/Nyholm/psr7/security/advisories/GHSA-wjfc-pgfp-pv9c"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/guzzle/psr7/security/advisories/GHSA-q7rv-6hp3-vh96"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/guzzle/psr7/security/advisories/GHSA-wxmh-65f7-jcvw"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-29197"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/nyholm/psr7/2023-04-17.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Nyholm/psr7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-436" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-04-21T20:27:30Z",
    "nvd_published_at" : null
  }
}