Vulnerability-Lookup

RHSA-2026:99826

Vulnerability from csaf_redhat - Published: 2026-11-12 20:38 - Updated: 2026-11-13 00:07

Summary

Red Hat Security Advisory: rhc security update

Severity

Important

Notes

Topic: An update for rhc is now available for Red Hat Enterprise Linux 7 Extended Lifecycle 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: rhc is a client tool and daemon that connects the system to Red Hat hosted services enabling system and subscription management. Security Fix(es): * golang.org/x/text: golang.org/x/text: Denial of Service via invalid UTF-8 input (CVE-2026-56852) * google.golang.org/grpc: gRPC-Go: Denial of Service via malformed RPC requests (CVE-2026-84445) 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-2026-56852

A flaw was found in golang.org/x/text. The norm.Iter component can enter an infinite loop when processing input that contains invalid UTF-8 (Unicode Transformation Format - 8-bit) bytes. A remote attacker could exploit this vulnerability by providing specially crafted input, leading to a Denial of Service (DoS) condition where the affected application becomes unresponsive.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-835 - Loop with Unreachable Exit Condition

Affected products

Fixed 4 products

Product	Version	Remediation
Unresolved product id: 7Server-ELS:rhc-1:0.2.4-5.el7_9.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-ELS:rhc-1:0.2.4-5.el7_9.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-ELS:rhc-1:0.2.4-5.el7_9.2.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-ELS:rhc-1:0.2.4-5.el7_9.2.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

CVE-2026-84445

A flaw was found in gRPC-Go. Servers created with xds.NewGRPCServer() can be exploited by a remote client sending a malformed RPC request that lacks the required :authority or Host headers. This can trigger an index-out-of-bounds panic, leading to the termination of the entire server process and a Denial of Service (DoS). In some deployments, this attack can be unauthenticated.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-125 - Out-of-bounds Read

Affected products

Fixed 4 products, the same list as for CVE-2026-56852

Threats

Impact Important

References

26 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:99826	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2504233	external
https://bugzilla.redhat.com/show_bug.cgi?id=2533175	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-56852	self
https://bugzilla.redhat.com/show_bug.cgi?id=2504233	external
https://www.cve.org/CVERecord?id=CVE-2026-56852	external
https://nvd.nist.gov/vuln/detail/CVE-2026-56852	external
https://go.dev/cl/794100	external
https://go.dev/issue/80142	external
https://pkg.go.dev/vuln/GO-2026-5970	external
https://access.redhat.com/security/cve/CVE-2026-84445	self
https://bugzilla.redhat.com/show_bug.cgi?id=2533175	external
https://www.cve.org/CVERecord?id=CVE-2026-84445	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84445	external
https://github.com/grpc/grpc-go/commit/3822494d8e…	external
https://github.com/grpc/grpc-go/commit/8668b69c16…	external
https://github.com/grpc/grpc-go/commit/93e31b4854…	external
https://github.com/grpc/grpc-go/issues/9354	external
https://github.com/grpc/grpc-go/pull/9365	external
https://github.com/grpc/grpc-go/pull/9366	external
https://github.com/grpc/grpc-go/pull/9367	external
https://github.com/grpc/grpc-go/releases/tag/v1.82.2	external
https://github.com/grpc/grpc-go/releases/tag/v1.83.2	external
https://github.com/grpc/grpc-go/security/advisori…	external

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          "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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            "integrityImpact": "NONE",
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          "url": "https://github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297f",
          "url": "https://github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297f"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/issues/9354",
          "url": "https://github.com/grpc/grpc-go/issues/9354"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/pull/9365",
          "url": "https://github.com/grpc/grpc-go/pull/9365"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/pull/9366",
          "url": "https://github.com/grpc/grpc-go/pull/9366"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/pull/9367",
          "url": "https://github.com/grpc/grpc-go/pull/9367"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/releases/tag/v1.82.2",
          "url": "https://github.com/grpc/grpc-go/releases/tag/v1.82.2"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/releases/tag/v1.83.2",
          "url": "https://github.com/grpc/grpc-go/releases/tag/v1.83.2"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj",
          "url": "https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj"
        }
      ],
      "release_date": "2026-09-14T16:11:41.401000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-12T20:38:05+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",
          "product_ids": [
            "7Server-ELS:rhc-1:0.2.4-5.el7_9.2.ppc64le",
            "7Server-ELS:rhc-1:0.2.4-5.el7_9.2.s390x",
            "7Server-ELS:rhc-1:0.2.4-5.el7_9.2.src",
            "7Server-ELS:rhc-1:0.2.4-5.el7_9.2.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:99826"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "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"
          },
          "products": [
            "7Server-ELS:rhc-1:0.2.4-5.el7_9.2.ppc64le",
            "7Server-ELS:rhc-1:0.2.4-5.el7_9.2.s390x",
            "7Server-ELS:rhc-1:0.2.4-5.el7_9.2.src",
            "7Server-ELS:rhc-1:0.2.4-5.el7_9.2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "google.golang.org/grpc: gRPC-Go: Denial of Service via malformed RPC requests"
    }
  ]
}

CVE-2026-56852 (GCVE-0-2026-56852)

Vulnerability from cvelistv5 – Published: 2026-07-21 19:18 – Updated: 2026-08-10 22:57

Title

Infinite loop on invalid input in golang.org/x/text

Summary

A norm.Iter can enter an infinite loop when handling input containing invalid UTF-8 bytes.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-23 13:26 UTC

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

Go CNA under the Google root

CNA scorecard E 42/100 over 76 records in the last 180 days details

References

3 references

URL	Tags
https://go.dev/issue/80142
https://go.dev/cl/794100
https://pkg.go.dev/vuln/GO-2026-5970

Impacted products

1 product

Vendor	Product	Version
golang.org/x/text	golang.org/x/text/unicode/norm	Affected: 0 , < 0.39.0 (semver)

Credits

Viky Choi ("vikychoi" on GitHub)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
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            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-56852",
                "options": [
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                    "Exploitation": "none"
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                  },
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                    "Technical Impact": "partial"
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                "timestamp": "2026-07-23T13:26:14.918983Z",
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            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-835",
                "description": "CWE-835 Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-23T13:26:20.232Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/text/unicode/norm",
          "product": "golang.org/x/text/unicode/norm",
          "programRoutines": [
            {
              "name": "nextComposed"
            },
            {
              "name": "Form.Append"
            },
            {
              "name": "Form.AppendString"
            },
            {
              "name": "Form.Bytes"
            },
            {
              "name": "Form.FirstBoundary"
            },
            {
              "name": "Form.FirstBoundaryInString"
            },
            {
              "name": "Form.IsNormal"
            },
            {
              "name": "Form.IsNormalString"
            },
            {
              "name": "Form.LastBoundary"
            },
            {
              "name": "Form.NextBoundary"
            },
            {
              "name": "Form.NextBoundaryInString"
            },
            {
              "name": "Form.Properties"
            },
            {
              "name": "Form.PropertiesString"
            },
            {
              "name": "Form.QuickSpan"
            },
            {
              "name": "Form.QuickSpanString"
            },
            {
              "name": "Form.Span"
            },
            {
              "name": "Form.SpanString"
            },
            {
              "name": "Form.String"
            },
            {
              "name": "Form.Transform"
            },
            {
              "name": "Iter.Init"
            },
            {
              "name": "Iter.InitString"
            },
            {
              "name": "Iter.Next"
            },
            {
              "name": "Iter.Seek"
            },
            {
              "name": "normReader.Read"
            },
            {
              "name": "normWriter.Write"
            }
          ],
          "vendor": "golang.org/x/text",
          "versions": [
            {
              "lessThan": "0.39.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Viky Choi (\"vikychoi\" on GitHub)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A norm.Iter can enter an infinite loop when handling input containing invalid UTF-8 bytes."
        }
      ],
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        {
          "descriptions": [
            {
              "description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-10T22:57:54.703Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/80142"
        },
        {
          "url": "https://go.dev/cl/794100"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5970"
        }
      ],
      "title": "Infinite loop on invalid input in golang.org/x/text"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-56852",
    "datePublished": "2026-07-21T19:18:59.951Z",
    "dateReserved": "2026-06-23T15:10:49.352Z",
    "dateUpdated": "2026-08-10T22:57:54.703Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-84445 (GCVE-0-2026-84445)

Vulnerability from cvelistv5 – Published: 2026-09-14 16:11 – Updated: 2026-09-14 16:36

Title

gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers

Summary

gRPC-Go is the Go language implementation of gRPC. Prior to 1.82.2 and 1.83.2, servers created with xds.NewGRPCServer() allow internal/transport/http2_server.go to accept an RPC containing neither the :authority header nor the Host header, while RouteAndProcess in internal/xds/server/routing.go assumes that an authority value exists and indexes the empty slice. A remote client that can complete transport connection establishment can trigger an index-out-of-bounds panic that is not recovered by the per-RPC goroutine and terminates the entire server process. In insecure or ordinary TLS deployments the request can be unauthenticated, while strict mTLS or ALTS deployments require valid transport credentials before the malformed RPC can reach the interceptor. This issue is fixed in versions 1.82.2 and 1.83.2.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 16:36 UTC

CWE

CWE-129 - Improper Validation of Array Index
CWE-248 - Uncaught Exception

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7820 records in the last 180 days details

References

10 references

URL	Tags
https://github.com/grpc/grpc-go/security/advisori…	x_refsource_CONFIRM
https://github.com/grpc/grpc-go/issues/9354	x_refsource_MISC
https://github.com/grpc/grpc-go/pull/9365	x_refsource_MISC
https://github.com/grpc/grpc-go/pull/9366	x_refsource_MISC
https://github.com/grpc/grpc-go/pull/9367	x_refsource_MISC
https://github.com/grpc/grpc-go/commit/3822494d8e…	x_refsource_MISC
https://github.com/grpc/grpc-go/commit/8668b69c16…	x_refsource_MISC
https://github.com/grpc/grpc-go/commit/93e31b4854…	x_refsource_MISC
https://github.com/grpc/grpc-go/releases/tag/v1.82.2	x_refsource_MISC
https://github.com/grpc/grpc-go/releases/tag/v1.83.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
grpc	grpc-go	Affected: < 1.82.2 Affected: >= 1.83.0, < 1.83.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-84445",
                "options": [
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                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-09-14T16:36:00.554548Z",
                "version": "2.0.3"
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        "providerMetadata": {
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      }
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          "versions": [
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        }
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            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
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              "lang": "en",
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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

RHSA-2026:99826

CVE-2026-56852 (GCVE-0-2026-56852)

CVE-2026-84445 (GCVE-0-2026-84445)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour