# gun (Hex) vulnerabilities

4 known vulnerabilities (2 high, 2 medium), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://hex.pm/packages/gun

## Advisories (4)

### [CVE-2026-43966](https://cve.now/CVE-2026-43966): HTTP Response Splitting via Non-VCHAR Bytes in cow\_http\_struct\_hd:escape\_string/2

- Severity: Medium 6.3
- Published: Jun 8, 2026
- Affected: fixed in 2.16.0.

### [CVE-2026-43973](https://cve.now/CVE-2026-43973): gun HTTP/1.1 response buffer has no size limit allowing server-controlled memory exhaustion

- Severity: High 8.7
- Published: Jun 8, 2026
- Affected: from 1.0.0, fixed in 2.4.0; from 1.0.0, fixed in 2.4.0.

### [CVE-2026-43972](https://cve.now/CVE-2026-43972): gun HTTP/2 PUSH\_PROMISE authority not validated against connection origin allows cross-origin cookie injection

- Severity: Medium 6.3
- Published: Jun 8, 2026
- Affected: from 2.0.0, fixed in 2.4.0; from 2.0.0, fixed in 2.4.0.

### [CVE-2026-43974](https://cve.now/CVE-2026-43974): gun HTTP/1.1 client accepts unsolicited 101 Switching Protocols response allowing server-driven protocol hijack and OOM

- Severity: High 8.7
- Published: Jun 8, 2026
- Affected: from 2.0.0, fixed in 2.4.0; from 2.0.0, fixed in 2.4.0.

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