mediumVulnerability
GHSA-w67g-5rqw-f597
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
Properties
- ghsa_id
- GHSA-w67g-5rqw-f597
- severity
- medium
- summary
- Gorilla WebSocket Uses Cryptographically Weak PRNG for WebSocket Mask Key
- cve_id
- GHSA-w67g-5rqw-f597
- is_ghsa_only
- true
- ghsa_published
- 2026-08-24T21:00:54Z
- source_url
- https://github.com/advisories/GHSA-w67g-5rqw-f597
- ghsa_updated
- 2026-08-24T21:00:54Z
Related Entities (4)
VULNERABLE_TO (1)
←[Software]go/github.com/gorilla/websocket
AFFECTS (1)
→[Software]go/github.com/gorilla/websocket
HAS_WEAKNESS (1)
→[Weakness]Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
REPORTED_BY (1)
→[Source]GitHub Advisory Database
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