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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

Quick assessment

Affected
golang.org/x/net golang.org/x/net/http2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于处理SETTINGS帧时，若接收到值为0的SETTINGS_MAX_FRAME_SIZE，传输层会进入无限循环写入CONTINUATION帧。

AI Predicted 7.5 Difficulty: Easy EPSS 0.78% · P53

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
Go standard library net/http < 1.25.10 affected
1.26.0-0< 1.26.3 affected
golang.org/x/net golang.org/x/net/http2 < 0.53.0 affected
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I. Basic Information for CVE-2026-33814

Vulnerability Information
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Vulnerability Title
Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于处理SETTINGS帧时，若接收到值为0的SETTINGS_MAX_FRAME_SIZE，传输层会进入无限循环写入CONTINUATION帧。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
golang.org/x/net golang.org/x/net/http2 0 ~ 0.53.0 -
Go standard library net/http 0 ~ 1.25.10 -

II. Public POCs for CVE-2026-33814

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III. Intelligence Information for CVE-2026-33814

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Patches & Fixes for CVE-2026-33814 (2)

Vendor Pages for CVE-2026-33814 (1)

Other References for CVE-2026-33814 (2)

IV. Related Vulnerabilities

Same product: golang.org/x/net/http2
Same vendor: golang.org/x/net

V. Comments for CVE-2026-33814

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