Client denial of service via zero frame size
Published May 7, 2026 · Updated Aug 28, 2026
Denial of service in Go HTTP/2 clients before 1.25.10 and 1.26.0-0 through 1.26.2 allows remote attackers to exhaust resources. The transport accepts a zero SETTINGS_MAX_FRAME_SIZE and repeatedly writes zero-length CONTINUATION frames without advancing its output. Exploitation requires a malicious or compromised HTTP/2 server contacted by the client; the resulting infinite loop consumes client resources and interrupts service.
Summary
What happened
Denial of service in Go HTTP/2 clients before 1.25.10 and 1.26.0-0 through 1.26.2 allows remote attackers to exhaust resources. The transport accepts a zero SETTINGS_MAX_FRAME_SIZE and repeatedly writes zero-length CONTINUATION frames without advancing its output. Exploitation requires a malicious or compromised HTTP/2 server contacted by the client; the resulting infinite loop consumes client resources and interrupts service.
The record
- CVE
- CVE-2026-33814
- Published
- May 7, 2026
- Updated
- Aug 28, 2026
- Vendor
- 389 Directory Server
- Product
- Machine Deletion Remediation Operator
- Classifications
- CWE-835, CWE-606, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 7, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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