RHSA-2026:74581

Vulnerability from csaf_redhat - Published: 2026-10-01 19:11 - Updated: 2026-10-02 19:31
Summary
Red Hat Security Advisory: skopeo security update
Severity
Important
Notes
Topic: An update for skopeo is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The skopeo command lets you inspect images from container image registries, get images and image layers, and use signatures to create and verify files. Security Fix(es): * net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame (CVE-2026-33814) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-33814

A flaw was found in the HTTP/2 protocol implementation within the Go standard library (golang.org/x/net and net/http/internal/http2). A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGS_MAX_FRAME_SIZE parameter set to zero. This malicious frame causes the transport layer to enter an infinite loop of writing CONTINUATION frames, leading to resource exhaustion and a Denial of Service (DoS) condition.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-606 - Unchecked Input for Loop Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-2:1.18.1-6.el9_6.1.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-2:1.18.1-6.el9_6.1.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-2:1.18.1-6.el9_6.1.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-2:1.18.1-6.el9_6.1.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-2:1.18.1-6.el9_6.1.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-debuginfo-2:1.18.1-6.el9_6.1.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-debuginfo-2:1.18.1-6.el9_6.1.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-debuginfo-2:1.18.1-6.el9_6.1.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-debuginfo-2:1.18.1-6.el9_6.1.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-debugsource-2:1.18.1-6.el9_6.1.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-debugsource-2:1.18.1-6.el9_6.1.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-debugsource-2:1.18.1-6.el9_6.1.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-debugsource-2:1.18.1-6.el9_6.1.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-tests-2:1.18.1-6.el9_6.1.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-tests-2:1.18.1-6.el9_6.1.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-tests-2:1.18.1-6.el9_6.1.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:skopeo-tests-2:1.18.1-6.el9_6.1.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-33814",
      "cwe": {
        "id": "CWE-606",
        "name": "Unchecked Input for Loop Condition"
      },
      "discovery_date": "2026-05-07T20:01:11.324941+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2467815"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the HTTP/2 protocol implementation within the Go standard library (golang.org/x/net and net/http/internal/http2). A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGS_MAX_FRAME_SIZE parameter set to zero. This malicious frame causes the transport layer to enter an infinite loop of writing CONTINUATION frames, leading to resource exhaustion and a Denial of Service (DoS) condition.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important denial of service flaw in the Go HTTP/2 protocol implementation allows a remote, unauthenticated attacker to exhaust system resources. By sending a specially crafted HTTP/2 SETTINGS frame with a zero-value SETTINGS_MAX_FRAME_SIZE, the vulnerable Go library enters an infinite loop, impacting the availability of services utilizing HTTP/2.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-33814"
        },
        {
          "category": "external",
          "summary": "RHBZ#2467815",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467815"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-33814",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-33814"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33814",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33814"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/761581",
          "url": "https://go.dev/cl/761581"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/761640",
          "url": "https://go.dev/cl/761640"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/78476",
          "url": "https://go.dev/issue/78476"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M",
          "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-4918",
          "url": "https://pkg.go.dev/vuln/GO-2026-4918"
        }
      ],
      "release_date": "2026-05-07T19:41:17.631000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-01T19:11:40+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "url": "https://access.redhat.com/errata/RHSA-2026:74581"
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            "attackVector": "NETWORK",
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame"
    }
  ]
}



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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.