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
Published
Updated
Check this codebase for CVE-2026-33814 and fix it if it is affected.
What it is: CVE-2026-33814 is a high-severity denial of service vulnerability in Golang Go, published on 7 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-33814 in the wild and no public exploit code.
Affected packages and fixed versions:
- golang (Bitnami): affected all versions; fixed in 1.25.10, 1.26.3
- golang.org/x/net (Go): affected all versions; fixed in 0.53.0
- stdlib (Go): affected all versions; fixed in 1.25.10, 1.26.3
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-33814/ (Markdown: https://insights.sbomify.com/CVE-2026-33814/index.md)
An attacker can cause a denial of service by sending a malformed HTTP/2 SETTINGS frame with a zero max frame size, triggering an infinite loop in the Go HTTP/2 transport.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33814?
CVE-2026-33814 is a high-severity denial of service vulnerability in Golang Go, published on 7 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-33814?
3 open source packages ship an affected version, including golang, golang.org/x/net and stdlib. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | All versions | 1.25.10, 1.26.3 |
golang.org/x/net Go | All versions | 0.53.0 |
stdlib Go | All versions | 1.25.10, 1.26.3 |
Linux distribution packages (37)
ose-aws-ecr-image-credential-provider Red Hat:openshift:4.17::el8 | All versions | 0:4.17.0-202609291832.p2.g300430d.assembly.stream.el8 |
ose-aws-ecr-image-credential-provider Red Hat:openshift:4.17::el9 | All versions | 0:4.17.0-202609291832.p2.g300430d.assembly.stream.el9 |
openshift-clients Red Hat:openshift:4.18::el8 | All versions | 0:4.18.0-202610071009.p2.ga622623.assembly.stream.el8 |
openshift-clients-redistributable Red Hat:openshift:4.18::el8 | All versions | 0:4.18.0-202610071009.p2.ga622623.assembly.stream.el8 |
openshift-clients Red Hat:openshift:4.18::el9 | All versions | 0:4.18.0-202610071009.p2.ga622623.assembly.stream.el9 |
openshift-clients-redistributable Red Hat:openshift:4.18::el9 | All versions | 0:4.18.0-202610071009.p2.ga622623.assembly.stream.el9 |
openshift-clients Red Hat:openshift:4.19::el8 | All versions | 0:4.19.0-202610062306.p2.g2709219.assembly.stream.el8 |
openshift-clients-redistributable Red Hat:openshift:4.19::el8 | All versions | 0:4.19.0-202610062306.p2.g2709219.assembly.stream.el8 |
openshift-clients Red Hat:openshift:4.19::el9 | All versions | 0:4.19.0-202610062306.p2.g2709219.assembly.stream.el9 |
openshift-clients-redistributable Red Hat:openshift:4.19::el9 | All versions | 0:4.19.0-202610062306.p2.g2709219.assembly.stream.el9 |
ose-azure-acr-image-credential-provider Red Hat:openshift:4.19::el9 | All versions | 0:4.19.0-202610062306.p2.gb249afb.assembly.stream.el9 |
ose-azure-acr-image-credential-provider Red Hat:openshift:4.20::el8 | All versions | 0:4.20.0-202609250718.p2.g5e41860.assembly.stream.el8 |
microshift Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-ai-model-serving Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-ai-model-serving-release-info Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-cert-manager Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-cert-manager-release-info Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-gateway-api Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-gateway-api-release-info Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-greenboot Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-low-latency Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-multus Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-multus-release-info Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-networking Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-observability Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-olm Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-olm-release-info Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-release-info Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
microshift-selinux Red Hat:openshift:4.20::el9 | All versions | 0:4.20.37-202609041024.p0.g3d0d639.assembly.4.20.37.el9 |
ose-azure-acr-image-credential-provider Red Hat:openshift:4.20::el9 | All versions | 0:4.20.0-202609250718.p2.g5e41860.assembly.stream.el9 |
microshift Red Hat:openshift:4.21::el9 | All versions | 0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9 |
microshift-ai-model-serving Red Hat:openshift:4.21::el9 | All versions | 0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9 |
microshift-ai-model-serving-release-info Red Hat:openshift:4.21::el9 | All versions | 0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9 |
microshift-cert-manager Red Hat:openshift:4.21::el9 | All versions | 0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9 |
microshift-cert-manager-release-info Red Hat:openshift:4.21::el9 | All versions | 0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9 |
microshift-gateway-api Red Hat:openshift:4.21::el9 | All versions | 0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9 |
microshift-gateway-api-release-info Red Hat:openshift:4.21::el9 | All versions | 0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9 |
Products include Golang Go, Golang Http2.
How do I fix CVE-2026-33814?
Upgrade golang to a fixed version for your release line: 1.25.10 or 1.26.3.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-33814 being exploited?
There is no known exploitation of CVE-2026-33814 in the wild and no public exploit code.
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Sources
Also known as AZL-86288, AZL-86394, AZL-86396, AZL-86399, AZL-86409, AZL-86420 and 1302 more.