RHSA-2026:75689

Vulnerability from csaf_redhat - Published: 2026-10-05 09:03 - Updated: 2026-10-06 08:38
Summary
Red Hat Security Advisory: rhc-worker-script security update
Severity
Important
Notes
Topic: An update for rhc-worker-script 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: Remote Host Configuration (rhc) worker for executing scripts on hosts managed by Red Hat Lightspeed. Security Fix(es): * encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818) * html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858) * crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862) * 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-2026-33818

A flaw was found in the `encoding/asn1` package in Go. An attacker could provide a specially crafted, deeply-nested Abstract Syntax Notation One (ASN.1) structure, leading to excessive recursion during the `Unmarshal` operation. This could result in stack 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-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
Affected products
Product Identifier Version Remediation
Unresolved product id: 7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.src —
Vendor Fix fix
Unresolved product id: 7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-56858

A flaw was found in the `html/template` component of Go (golang). Pathological inputs could prematurely close an unescaped forward slash ('/'), allowing an attacker to inject arbitrary content. This could lead to Cross-Site Scripting (XSS), where malicious scripts are executed in a user's browser, potentially compromising user data or actions.

8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Fixed 2 products, the same list as for CVE-2026-33818
Threats
Impact Important
CVE-2026-56862

A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, 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-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Fixed 2 products, the same list as for CVE-2026-33818
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 2 products, the same list as for CVE-2026-33818
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:75689 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2515815 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515838 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515839 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-2026-33818 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515815 external
https://www.cve.org/CVERecord?id=CVE-2026-33818 external
https://nvd.nist.gov/vuln/detail/CVE-2026-33818 external
https://go.dev/cl/814980 external
https://go.dev/issue/80405 external
https://groups.google.com/g/golang-announce/c/94p… external
https://pkg.go.dev/vuln/GO-2026-5972 external
https://access.redhat.com/security/cve/CVE-2026-56858 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515838 external
https://www.cve.org/CVERecord?id=CVE-2026-56858 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56858 external
https://go.dev/cl/807100 external
https://go.dev/issue/80435 external
https://pkg.go.dev/vuln/GO-2026-6091 external
https://access.redhat.com/security/cve/CVE-2026-56862 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515839 external
https://www.cve.org/CVERecord?id=CVE-2026-56862 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56862 external
https://go.dev/cl/804261 external
https://go.dev/issue/80528 external
https://pkg.go.dev/vuln/GO-2026-6090 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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          "title": "Statement"
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.src",
            "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "html/template: golang: Go html/template: Cross-Site Scripting via pathological input"
    },
    {
      "cve": "CVE-2026-56862",
      "cwe": {
        "id": "CWE-1050",
        "name": "Excessive Platform Resource Consumption within a Loop"
      },
      "discovery_date": "2026-08-13T22:16:41.928450+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2515839"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service vulnerability in the `golang` `crypto/tls` package. A remote, unauthenticated attacker can exploit this flaw by continuously sending `KeyUpdate` messages during a TLS handshake, forcing the server to perform indefinite key derivation operations. This resource exhaustion can lead to a denial of service for applications and services in Red Hat products that use the affected `crypto/tls` library and are exposed to untrusted network clients.",
          "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": {
        "fixed": [
          "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.src",
          "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "RHBZ#2515839",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515839"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-56862",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/804261",
          "url": "https://go.dev/cl/804261"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/80528",
          "url": "https://go.dev/issue/80528"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-6090",
          "url": "https://pkg.go.dev/vuln/GO-2026-6090"
        }
      ],
      "release_date": "2026-08-13T21:58:53.216000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-05T09:03:19+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-worker-script-0:0.12-1.el7_9.src",
            "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:75689"
        }
      ],
      "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-worker-script-0:0.12-1.el7_9.src",
            "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages"
    },
    {
      "cve": "CVE-2026-84445",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2026-09-14T16:22:17.356407+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2533175"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "google.golang.org/grpc: gRPC-Go: Denial of Service via malformed RPC requests",
          "title": "Vulnerability summary"
        },
        {
          "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": {
        "fixed": [
          "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.src",
          "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-84445"
        },
        {
          "category": "external",
          "summary": "RHBZ#2533175",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533175"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-84445",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-84445"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-84445",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84445"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/commit/3822494d8ea03b992c089fd2a195f041762fffb7",
          "url": "https://github.com/grpc/grpc-go/commit/3822494d8ea03b992c089fd2a195f041762fffb7"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4",
          "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": "2026-10-05T09:03:19+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-worker-script-0:0.12-1.el7_9.src",
            "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:75689"
        }
      ],
      "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-worker-script-0:0.12-1.el7_9.src",
            "7Server-ELS:rhc-worker-script-0:0.12-1.el7_9.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "google.golang.org/grpc: gRPC-Go: Denial of Service via malformed RPC requests"
    }
  ]
}



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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.