CVE-2026-33814 (GCVE-0-2026-33814)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-06-30 03:15
VLAI
Title
Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
14 references
| URL | Tags |
|---|---|
| https://go.dev/cl/761581 | |
| https://go.dev/cl/761640 | |
| https://go.dev/issue/78476 | |
| https://groups.google.com/g/golang-announce/c/qcC… | |
| https://pkg.go.dev/vuln/GO-2026-4918 | |
| https://access.redhat.com/security/cve/CVE-2026-33814 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2467815 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:23262 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:23264 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33120 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33123 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33142 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33150 | vendor-advisoryx_refsource_REDHAT |
Impacted products
14 products
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/http2 |
Affected:
0 , < 0.53.0
(semver)
|
|
| Go standard library | net/http |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat OpenShift Service Mesh 3.0 |
cpe:/a:redhat:service_mesh:3.0::el9 |
|
| Red Hat | Red Hat OpenShift Service Mesh 3.1 |
cpe:/a:redhat:service_mesh:3.1::el9 |
|
| Red Hat | Red Hat OpenShift Service Mesh 3.2 |
cpe:/a:redhat:service_mesh:3.2::el9 |
|
| Red Hat | Red Hat OpenShift Service Mesh 3.3 |
cpe:/a:redhat:service_mesh:3.3::el9 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux AI (RHEL AI) 3 |
cpe:/a:redhat:enterprise_linux_ai:3 |
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4 |
|
| Red Hat | Red Hat OpenShift Virtualization 4 |
cpe:/a:redhat:container_native_virtualization:4 |
|
| Red Hat | OpenShift Service Mesh 2 |
cpe:/a:redhat:service_mesh:2 |
Credits
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"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-33814\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-08T18:00:53.951676Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-08T18:00:42.436Z\"}}], \"cna\": {\"title\": \"Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net\", \"credits\": [{\"lang\": \"en\", \"value\": \"Marwan Atia (marwansamir688@gmail.com)\"}], \"affected\": [{\"vendor\": \"golang.org/x/net\", \"product\": \"golang.org/x/net/http2\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.53.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/net/http2\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"clientConnReadLoop.processSettingsNoWrite\"}, {\"name\": \"Transport.NewClientConn\"}, {\"name\": \"Transport.RoundTrip\"}, {\"name\": \"Transport.RoundTripOpt\"}, {\"name\": \"clientConnPool.GetClientConn\"}, {\"name\": \"noDialClientConnPool.GetClientConn\"}, {\"name\": \"noDialH2RoundTripper.NewClientConn\"}, {\"name\": \"noDialH2RoundTripper.RoundTrip\"}, {\"name\": \"unencryptedTransport.RoundTrip\"}]}, {\"vendor\": \"Go standard library\", \"product\": \"net/http\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.25.10\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.26.0-0\", \"lessThan\": \"1.26.3\", \"versionType\": \"semver\"}], \"packageName\": \"net/http\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"http2clientConnReadLoop.processSettingsNoWrite\"}, {\"name\": \"Client.CloseIdleConnections\"}, {\"name\": \"Client.Do\"}, {\"name\": \"Client.Get\"}, {\"name\": \"Client.Head\"}, {\"name\": \"Client.Post\"}, {\"name\": \"Client.PostForm\"}, {\"name\": \"ClientConn.Close\"}, {\"name\": \"ClientConn.RoundTrip\"}, {\"name\": \"Get\"}, {\"name\": \"Head\"}, {\"name\": \"Post\"}, {\"name\": \"PostForm\"}, {\"name\": \"Transport.CloseIdleConnections\"}, {\"name\": \"Transport.NewClientConn\"}, {\"name\": \"Transport.RoundTrip\"}, {\"name\": \"http1ClientConn.Close\"}, {\"name\": \"http1ClientConn.RoundTrip\"}, {\"name\": \"http2Transport.NewClientConn\"}, {\"name\": \"http2Transport.RoundTrip\"}, {\"name\": \"http2Transport.RoundTripOpt\"}, {\"name\": \"http2clientConnPool.GetClientConn\"}, {\"name\": \"http2noDialClientConnPool.GetClientConn\"}, {\"name\": \"http2noDialH2RoundTripper.NewClientConn\"}, {\"name\": \"http2noDialH2RoundTripper.RoundTrip\"}, {\"name\": \"http2unencryptedTransport.RoundTrip\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/761581\"}, {\"url\": \"https://go.dev/cl/761640\"}, {\"url\": \"https://go.dev/issue/78476\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/qcCIEXso47M\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-4918\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-05-07T19:41:17.631Z\"}}}",
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"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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