CVE-2026-103472

Summary

restbed through 5.0.0 accepts WebSocket frames with declared payload lengths up to 2^63 bytes and buffers the payload without size limits in an unbounded stream buffer. Remote unauthenticated attackers can declare large frame sizes and stream payload data to exhaust server memory, causing denial of service through process crash.

Affected Software

Weaknesses

• CWE-770: Allocation of Resources Without Limits or Throttling

References

• https://github.com/Corvusoft/restbed/issues/558
• https://github.com/Corvusoft/restbed
• https://github.com/Corvusoft/restbed/blob/e1227a297ce6d4e9f78222456507b29bb8ab77e9/src/corvusoft/restbed/detail/web_socket_impl.cpp#L117
• https://www.vulncheck.com/advisories/restbed-through-5.0.0-websocket-memory-exhaustion-via-unbounded-frame-buffering

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