GHSA-w67g-5rqw-f597
MediumSummary
gorilla/websocket used math/rand (a cryptographically weak pseudo-random number generator) to generate WebSocket frame mask keys. Masking keys MUST be unpredictable to prevent frame content injection attacks.
Risk Assessment
Predictable mask keys could allow an attacker to inject data into WebSocket traffic, leading to session hijacking or modification of transmitted information.
Recommendation
Update gorilla/websocket to a patched version that uses a cryptographically secure random number generator.
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Original NVD description (English source)
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
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

