No exploitation reportedFix available

CVE-2026-33814

Q: Is CVE-2026-33814 actively exploited?

Active exploitation of CVE-2026-33814 has not been confirmed. Its EPSS score was 0.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-33814?

CVE-2026-33814 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2026-05-07
Fixed in1.26.3 · 1.25.10
WeaknessCWE-606 · CWE-835

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2026-05-0720:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-33814?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-33814?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Branch	Affected	Fixed in	Source
1.26	≥ 1.26.0, < 1.26.3	1.26.3	NVD
1.25	< 1.25.10	1.25.10	NVD · OSV

Golang http2

Branch	Affected	Fixed in	Source
0.53	< 0.53.0	0.53.0	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

delveAlmaLinux:8all versions · fixed in 1.25.2-1.module_el8.10.0+4074+24330916
golangAlmaLinux:8all versions · fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4and 7 other packages

Vendor advisories

CVE-2026-33814 Red Hat Product Security3,555 products fixed · 296 known affected
net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame
compliance/openshift-compliance-rhel8-operator as a component of Compliance Operator · edo/external-dns-rhel9 as a component of ExternalDNS Operator · redhat-user-workloads/far-operator-0-8 as a component of Fence Agents Remediation Operator · +293 more
RHSA-2026:82785 Red Hat Product Security19 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.14.76 bug fix and security update
RHSA-2026:82813 Red Hat Product Security56 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.15.70 bug fix and security update
RHSA-2026:82786 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.14.76 security and extras update
RHSA-2026:82814 Red Hat Product Security24 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.15.70 security and extras update
RHSA-2026:87410 Red Hat Product Security27 products fixed
Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI

161 more advisories

Full record on NVD

Fix

Update Go to 1.26.3 · 1.25.10
Vendor fix Red Hat Product Security RHSA-2026:82785 · 19 productsFor OpenShift Container Platform 4.14 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
Vendor fix Red Hat Product Security RHSA-2026:82813 · 56 productsFor OpenShift Container Platform 4.15 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
Vendor fix Red Hat Product Security RHSA-2026:82786 · 4 productsSee the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.14/html/release_notes/ Details on how…
Vendor fix Red Hat Product Security RHSA-2026:82814 · 24 productsSee the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.15/html/release_notes/ Details on how…
Vendor fix Red Hat Product Security RHSA-2026:87410 · 27 productsFor Red Hat OpenShift AI 2.25.12 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
Vendor fix Red Hat Product Security RHSA-2026:83480 · 56 productsFor OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…

Advisories and patches

go.devPatch
go.devPatch
groups.google.comRelease Notes
pkg.go.devVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-05-08
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.52026-05-08
CNACVSS 3.17.5read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-606read 2026-10-23
NVDweakness (CWE)CWE-835read 2026-10-23
FIRST EPSSEPSS score0.8 %2026-10-22
OSVaffected packages—
Microsoft MSRCadvisory—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-05-07
Last Modified: 2026-09-18
NVD status: Modified
MSRC Title: Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net

Frequently asked questions

What is CVE-2026-33814?

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.

Is CVE-2026-33814 actively exploited?

Active exploitation of CVE-2026-33814 has not been confirmed. Its EPSS score was 0.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-33814?

CVE-2026-33814 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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