CVE-2026-103472
CVE-2026-103472
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- github.com/Corvusoft/restbed/issues/558 (issue-tracking)
- github.com/Corvusoft/restbed (product)
- github.com/Corvusoft/restbed/blob/e1227a297ce6d4e9f78222456507b29bb8ab77e9/src/… (technical-description)
- www.vulncheck.com/advisories/restbed-through-5.0.0-websocket-memory-exhaustion-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103472?
- CVE-2026-103472 is a high-severity vulnerability, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-30.
- How severe is CVE-2026-103472?
- High severity. CVSS v3 base score is 7.5 out of 10.