Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-33814
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 20:16:42 UTC
Updated2026-07-10 12:16:41 UTC
DescriptionWhen 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000190000 probability, percentile 0.052620000 (date 2026-05-12)

Problem Types: CWE-835 | CWE-606 | CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') | CWE-606 Unchecked Input for Loop Condition

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1ADPCVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Golang Go All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Golang.orgxnet Golang.org/x/net/http2 affected 0.53.0 semver Not specified
CNA Go Standard Library Net/http affected 1.25.10 semver Not specified
CNA Go Standard Library Net/http affected 1.26.0-0 1.26.3 semver Not specified
ADP Red Hat Cluster Observability Operator 1.5.0 Not specified Not specified
ADP Red Hat Red Hat Hardened Images Not specified Not specified
ADP Red Hat Red Hat OpenShift Service Mesh 3.1 Not specified Not specified
ADP Red Hat Red Hat OpenShift Service Mesh 3.2 Not specified Not specified
ADP Red Hat Red Hat OpenShift Service Mesh 3.3 Not specified Not specified
ADP Red Hat Red Hat OpenShift Service Mesh 3 Not specified Not specified
ADP Red Hat Red Hat Openshift Data Foundation 4.22 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
ADP Red Hat Red Hat OpenShift AI RHOAI Not specified Not specified
ADP Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified
ADP Red Hat Red Hat OpenShift Virtualization 4 Not specified Not specified
ADP Red Hat OpenShift Service Mesh 2 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:23262 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
go.dev/issue/78476 [email protected] go.dev Issue Tracking, Mailing List
go.dev/cl/761581 [email protected] go.dev Patch
access.redhat.com/errata/RHSA-2026:34342 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33814.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
access.redhat.com/errata/RHSA-2026:37387 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
go.dev/cl/761640 [email protected] go.dev Patch
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
access.redhat.com/errata/RHSA-2026:33123 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:23264 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:33120 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
groups.google.com/g/golang-announce/c/qcCIEXso47M [email protected] groups.google.com Release Notes
access.redhat.com/security/cve/CVE-2026-33814 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:33142 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
pkg.go.dev/vuln/GO-2026-4918 [email protected] pkg.go.dev Vendor Advisory
access.redhat.com/errata/RHSA-2026:33150 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Marwan Atia ([email protected]) (en)

Additional Advisory Data

SourceTimeEvent
ADP2026-05-07T20:01:11.324ZReported to Red Hat.
ADP2026-05-07T19:41:17.631ZMade public.

Solutions

ADP: RHSA-2026:34342: Cluster Observability Operator 1.5.0

ADP: RHSA-2026:23262: Red Hat Hardened Images

ADP: RHSA-2026:23264: Red Hat Hardened Images

ADP: RHSA-2026:33123: Red Hat OpenShift Service Mesh 3.1

ADP: RHSA-2026:33142: Red Hat OpenShift Service Mesh 3.2

ADP: RHSA-2026:33150: Red Hat OpenShift Service Mesh 3.3

ADP: RHSA-2026:33120: Red Hat OpenShift Service Mesh 3

ADP: RHSA-2026:37387: Red Hat Openshift Data Foundation 4.22

Workarounds

ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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