CVE-2026-33814
Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net
Description
When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0.
INFO
Published Date :
May 7, 2026, 8:16 p.m.
Last Modified :
May 13, 2026, 2:41 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Validate SETTINGS_MAX_FRAME_SIZE is not zero.
- Implement checks for invalid frame sizes.
- Apply relevant security patches.
Public PoC/Exploit Available at Github
CVE-2026-33814 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33814.
| URL | Resource |
|---|---|
| https://go.dev/cl/761581 | Patch |
| https://go.dev/cl/761640 | Patch |
| https://go.dev/issue/78476 | Issue Tracking Mailing List |
| https://groups.google.com/g/golang-announce/c/qcCIEXso47M | Release Notes |
| https://pkg.go.dev/vuln/GO-2026-4918 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33814 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33814
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
HCL Shell
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docker docker-compose grafana jdbc lgtm-stack makefile postgres spring-boot
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33814 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33814 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-835 Added CPE Configuration OR *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions up to (excluding) 1.25.10 *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions from (including) 1.26.0 up to (excluding) 1.26.3 *cpe:2.3:a:golang:http2:*:*:*:*:*:go:*:* versions up to (excluding) 0.53.0 Added Reference Type Go Project: https://go.dev/cl/761581 Types: Patch Added Reference Type Go Project: https://go.dev/cl/761640 Types: Patch Added Reference Type Go Project: https://go.dev/issue/78476 Types: Issue Tracking, Mailing List Added Reference Type Go Project: https://groups.google.com/g/golang-announce/c/qcCIEXso47M Types: Release Notes Added Reference Type Go Project: https://pkg.go.dev/vuln/GO-2026-4918 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by [email protected]
May. 07, 2026
Action Type Old Value New Value Added Description When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0. Added Reference https://go.dev/cl/761581 Added Reference https://go.dev/cl/761640 Added Reference https://go.dev/issue/78476 Added Reference https://groups.google.com/g/golang-announce/c/qcCIEXso47M Added Reference https://pkg.go.dev/vuln/GO-2026-4918