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

HIGH
7.5
CVSS Score
Published: May 7, 2026 at 07:41 PM UTC
Updated: October 26, 2026 at 08:10 PM UTC
18 products affected across 4 vendorsGoHTTP2.NET

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Severity
HIGH7.5
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.25.101.26.0 ≤ v < 1.26.3
Affected range stops below 1.25.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.26.3, so it looks safe — our inference, not a vendor statement
v < 0.53.0
Affected range stops below 0.53.0, so it looks safe — our inference, not a vendor statement
v < 1.25.101.26.0-0 ≤ v < 1.26.31.26.0-0
Affected range stops below 1.25.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.26.3, so it looks safe — our inference, not a vendor statement
v < 0.53.0
Affected range stops below 0.53.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (70)

Patch
Source: cverecord
https://go.dev/cl/761581
Patch
Source: cverecord
https://go.dev/cl/761640
Issue TrackingMailing List
Source: cverecord
https://go.dev/issue/78476
Vendor Advisory
Source: cverecord
https://pkg.go.dev/vuln/GO-2026-4918
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:23262
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:23264
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:33120

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-835CWE-606

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