OPENSUSE-SU-2026:10921-1

Vulnerability from csaf_opensuse - Published: 2026-06-01 00:00 - Updated: 2026-09-17 17:07
Summary
google-guest-agent-20260529.00-1.1 on GA media
Severity
Moderate
Notes
Title of the patch: google-guest-agent-20260529.00-1.1 on GA media
Description of the patch: These are all security issues fixed in the google-guest-agent-20260529.00-1.1 package on the GA media of openSUSE Tumbleweed.
Patchnames: openSUSE-Tumbleweed-2026-10921
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.aarch64 —
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.ppc64le —
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.s390x —
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.x86_64 —
Vendor Fix
Threats
Impact moderate
Affected products
Recommended 4 products, the same list as for CVE-2023-45288
Threats
Impact important
Affected products
Recommended 4 products, the same list as for CVE-2023-45288
Threats
Impact important
Affected products
Recommended 4 products, the same list as for CVE-2023-45288
Threats
Impact important
Affected products
Recommended 4 products, the same list as for CVE-2023-45288
Threats
Impact important

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          "text": "An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request\u0027s headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.",
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          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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          "text": "SSH servers which implement file transfer protocols are vulnerable to a denial of service attack from clients which complete the key exchange slowly, or not at all, causing pending content to be read into memory, but never transmitted.",
          "title": "CVE description"
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          "text": "https://www.suse.com/security/cve/CVE-2026-33186"
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          "text": "gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server successfully routed these requests to the correct handler, authorization interceptors (including the official `grpc/authz` package) evaluated the raw, non-canonical path string. Consequently, \"deny\" rules defined using canonical paths (starting with `/`) failed to match the incoming request, allowing it to bypass the policy if a fallback \"allow\" rule was present. This affects gRPC-Go servers that use path-based authorization interceptors, such as the official RBAC implementation in `google.golang.org/grpc/authz` or custom interceptors relying on `info.FullMethod` or `grpc.Method(ctx)`; AND that have a security policy contains specific \"deny\" rules for canonical paths but allows other requests by default (a fallback \"allow\" rule). The vulnerability is exploitable by an attacker who can send raw HTTP/2 frames with malformed `:path` headers directly to the gRPC server. The fix in version 1.79.3 ensures that any request with a `:path` that does not start with a leading slash is immediately rejected with a `codes.Unimplemented` error, preventing it from reaching authorization interceptors or handlers with a non-canonical path string. While upgrading is the most secure and recommended path, users can mitigate the vulnerability using one of the following methods: Use a validating interceptor (recommended mitigation); infrastructure-level normalization; and/or policy hardening.",
          "title": "CVE description"
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          "text": "https://www.suse.com/security/cve/CVE-2026-33814"
        }
      ],
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        {
          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
      ],
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          "summary": "SUSE Bug 1268758 for CVE-2026-33814",
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            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.ppc64le",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.s390x",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.aarch64",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.ppc64le",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.s390x",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-01T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-33814"
    },
    {
      "cve": "CVE-2026-39821",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-39821"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode(\"xn--example-.com\") incorrectly returns the name \"example.com\" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject \"example.com\" but permit \"xn--example-.com\". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name \"example.com\".",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.aarch64",
          "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.ppc64le",
          "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.s390x",
          "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-39821",
          "url": "https://www.suse.com/security/cve/CVE-2026-39821"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1266474 for CVE-2026-39821",
          "url": "https://bugzilla.suse.com/1266474"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.aarch64",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.ppc64le",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.s390x",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.aarch64",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.ppc64le",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.s390x",
            "openSUSE Tumbleweed:google-guest-agent-0:20260529.00-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-01T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-39821"
    }
  ]
}



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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.

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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.


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