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

Published May 7, 2026 · corrected/updated Oct 16, 2026 · golang go · evidence confidence high

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.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-33814 is a high public vulnerability record for golang go. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether golang go is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: golang.org/x/net (0 → 0.53.0); stdlib (0 → 1.25.10); golang/go; golang/http2. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 7.5, EPSS 0.8%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-606, CWE-835. Sources contributing to this record: cve_org, epss, nvd, osv. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

May 7, 2026 · OSV.dev
Detected
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.
Oct 15, 2026 · OSV.dev
Fix available
golang.org/x/net fixed in 0.53.0; stdlib fixed in 1.25.10
Oct 15, 2026 · OSV.dev
Fix available
golang.org/x/net fixed in 0.53.0
Oct 15, 2026 · OSV.dev
Fix available
stdlib fixed in 1.25.10
Oct 15, 2026 · OSV.dev
Updated
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.
Oct 16, 2026 · OSV.dev
Updated
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

Go golang.org/x/net0 → 0.53.0
Go stdlib0 → 1.25.10
cpe golang/goversion unspecified
cpe golang/http2version unspecified

Sources

CVE.orgVulnerability recordCVE-2026-33814
Official CVE identifier
cve.org
FIRST EPSSExploitation probabilityCVE-2026-33814
30-day exploitation probability 0.8%
first.org
NIST NVDVulnerability recordCVE-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.
nvd.nist.gov
OSV.devPackage advisoryGO-2026-4918
Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net
osv.dev