Details
- Type
- Denial of Service
- Impact
- Denial Of Service
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- Published
- 8 October 2026
- Updated
- 15 October 2026
- Weakness
- CWE-675
CVE-2026-78663 HTTP/2 Server - Denial of Service
HTTP/2 server contains a flow control bypass caused by double refunding connection-level flow control for the same data, letting malicious clients bypass connection-level flow control limits, exploit requires malicious client to reset streams.
CVSS base score
9.1
/10
Critical- CISA KEV
- Not listed
- Public exploit
- None known
- Authentication
- Not required
- EPSS
- 0.57% chance of exploitation in 30 days