GHSA-2j82-37xg-f9wp
Suggest an improvement- Source
- https://github.com/advisories/GHSA-2j82-37xg-f9wp
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-2j82-37xg-f9wp/GHSA-2j82-37xg-f9wp.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-2j82-37xg-f9wp
- Aliases
- Published
- 2026-06-08T15:33:00Z
- Modified
- 2026-07-29T16:11:37Z
- Severity
-
- 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- gun has an Unexpected Status Code or Return Value vulnerability
- Details
-
Unexpected Status Code or Return Value vulnerability in ninenines gun (gun_http module) allows a malicious HTTP server to force the client into raw protocol mode via an unsolicited 101 Switching Protocols response.
In gun_http:handle_inform/8, when a 101 Switching Protocols response is received over HTTP/1.1, the function verifies only that the Upgrade header is syntactically valid and that the stream reference is a plain reference(). It does not check whether the client ever sent an Upgrade or Connection: upgrade header on the corresponding request. Because this check is absent, any 101 response (solicited or not) causes gun to dispatch a gun_upgrade message to the caller and transition the entire connection to raw protocol mode.
A malicious or compromised HTTP server can send an unsolicited 101 response to any HTTP/1.1 request, causing the gun client to abandon HTTP framing for that connection. Once in raw mode, gun_raw applies no flow control (flow=infinity) and re-arms socket active mode after every received packet, so the server can flood the client with arbitrary bytes. These are forwarded as unbounded gun_data messages to the owner process, exhausting its mailbox and BEAM memory, ultimately crashing the VM.
This issue affects gun: from 2.0.0 before 2.4.0.
- Database specific
{ "cwe_ids": [ "CWE-841" ], "github_reviewed": true, "github_reviewed_at": "2026-07-29T15:45:59Z", "nvd_published_at": "2026-06-08T15:16:46Z", "severity": "HIGH" }- References
Affected packages
Hex / gun
Package
- Name
- gun
- Purl
- pkg:hex/gun