How severe is GHSA-w67g-5rqw-f597?

No CVSS score has been assigned to GHSA-w67g-5rqw-f597 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-w67g-5rqw-f597?

GHSA-w67g-5rqw-f597 affects the following packages: github.com/gorilla/websocket (Go). Ecosystems affected: Go.

How do I fix GHSA-w67g-5rqw-f597?

Update github.com/gorilla/websocket to 1.5.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-w67g-5rqw-f597 is resolved across your whole dependency graph.

How do I detect GHSA-w67g-5rqw-f597 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/gorilla/websocket, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-w67g-5rqw-f597 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-w67g-5rqw-f597 actively exploited in the wild?

No public exploit code has been indexed for GHSA-w67g-5rqw-f597 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-w67g-5rqw-f597 published, and has it been updated?

GHSA-w67g-5rqw-f597 was published on August 24, 2026 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

Not in CISA KEV

Gorilla WebSocket Uses Cryptographically Weak PRNG for WebSocket Mask KeyGHSA-w67g-5rqw-f597

Fix: gorilla/websocket@d67f418

GHSA-w67g-5rqw-f597 is a security vulnerability in github.com/gorilla/websocket. A fix is available for github.com/gorilla/websocket — see the affected versions and patch details below.

Also known asGO-2026-6278

Published

Aug 24, 2026

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 10, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐹github.com/gorilla/websocket

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

gorilla/websocket used math/rand (cryptographically weak pseudo-random number generator) to generate WebSocket frame mask keys prior to commit d67f4185. WebSocket masking keys MUST be unpredictable to prevent frame content injection attacks. math/rand produces deterministic output when seeded with a known value, enabling an attacker to predict or recover mask keys and inject content into WebSocket connections.

Type: Use of Cryptographically Weak Pseudo-Random Number Generator Fix: Replaced math/rand with crypto/rand (commit d67f4185, released in v1.5.3) Credit: bounty-hunter v6.0 silent-fix detection

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/gorilla/websocket`	all versions	1.5.3`go get github.com/gorilla/websocket@v1.5.3`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/gorilla/websocket, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/gorilla/websocket to 1.5.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-w67g-5rqw-f597 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

gorilla/websocket used `math/rand` (cryptographically weak pseudo-random number generator) to generate WebSocket frame mask keys prior to commit d67f4185. WebSocket masking keys MUST be unpredictable to prevent frame content injection attacks. math/rand produces deterministic output when seeded with a known value, enabling an attacker to predict or recover mask keys and inject content into WebSocket connections. **Type:** Use of Cryptographically Weak Pseudo-Random Number Generator **Fix:** Replaced math/rand with crypto/rand (commit d67f4185, released in v1.5.3) **Credit:** bounty-hunter v6.

O3 Security · Impact-Aware SCA

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