GHSA-qpgp-93vx-g8v8

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Source
https://github.com/advisories/GHSA-qpgp-93vx-g8v8
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-qpgp-93vx-g8v8/GHSA-qpgp-93vx-g8v8.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-qpgp-93vx-g8v8
Aliases
  • CVE-2026-47736
Downstream
Related
Published
2026-06-08T23:55:44Z
Modified
2026-06-10T08:14:25.103920769Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Puma PROXY Protocol v1 Parser Allows Remote Memory Exhaustion
Details

Impact

PROXY protocol support for Puma was added in version 5.5.0.

When PROXY protocol v1 support is enabled, Puma reads incoming bytes into an internal buffer. It waits for "\r\n" to determine whether a PROXY v1 line is present. If an attacker opens a TCP connection and continuously sends bytes without CRLF, Puma keeps appending to this pre-parse buffer.

This can cause unbounded in-process memory growth and additional CPU cost from repeatedly scanning the growing buffer for CRLF. A single, unauthenticated TCP connection can drive significant memory growth and may cause process/container OOM or degraded availability.

Only Puma servers using the following non-default config are affected:

   set_remote_address proxy_protocol: :v1

Patches

Users should upgrade to versions 7.2.1 or 8.0.2.

Workarounds

  • Disable PROXY protocol v1 parsing if it is not required:

      # remove/comment this:
  # set_remote_address proxy_protocol: :v1
    • Restrict direct network access to Puma listeners using PROXY protocol:
      • Only allow trusted load balancers/reverse proxies to connect.
      • Block arbitrary client TCP access with firewall/security group rules.

Resources

Database specific 
{
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-08T23:55:44Z",
    "nvd_published_at": null,
    "severity": "HIGH",
    "cwe_ids": [
        "CWE-400"
    ]
}
References

Affected packages

RubyGems / puma

Package

Name
puma
Purl
pkg:gem/puma

Affected ranges

Type
ECOSYSTEM
Events
Introduced
8.0.0
Fixed
8.0.2

Affected versions

8.*
8.0.0
8.0.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-qpgp-93vx-g8v8/GHSA-qpgp-93vx-g8v8.json"

RubyGems / puma

Package

Name
puma
Purl
pkg:gem/puma

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.5.0
Fixed
7.2.1

Affected versions

5.*
5.5.0
5.5.1
5.5.2
5.6.0
5.6.1
5.6.2
5.6.4
5.6.5
5.6.6
5.6.7
5.6.8
5.6.9
6.*
6.0.0
6.0.1
6.0.2
6.1.0
6.1.1
6.2.0
6.2.1
6.2.2
6.3.0
6.3.1
6.4.0
6.4.1
6.4.2
6.4.3
6.5.0
6.6.0
6.6.1
7.*
7.0.0.pre1
7.0.0
7.0.1
7.0.2
7.0.3
7.0.4
7.1.0
7.2.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-qpgp-93vx-g8v8/GHSA-qpgp-93vx-g8v8.json"