OPENSUSE-SU-2026:21494-1

Vulnerability from csaf_opensuse - Published: 2026-07-29 09:24 - Updated: 2026-09-17 17:40
Summary
Security update for gh
Severity
Important
Notes
Title of the patch: Security update for gh
Description of the patch: This update for gh fixes the following issues: Changes in gh: - CVE-2026-39821: reject all-ASCII xn-- Punycode labels in the vendored golang.org/x/net/idna package regardless of Go's unicode.Version (boo#1266618).
Patchnames: openSUSE-Leap-16.0-packagehub-445
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 Leap 16.0:gh-0:2.96.0-bp160.2.1.aarch64 —
Vendor Fix
Unresolved product id: openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.ppc64le —
Vendor Fix
Unresolved product id: openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.s390x —
Vendor Fix
Unresolved product id: openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.x86_64 —
Vendor Fix
Unresolved product id: openSUSE Leap 16.0:gh-bash-completion-0:2.96.0-bp160.2.1.noarch —
Vendor Fix
Unresolved product id: openSUSE Leap 16.0:gh-fish-completion-0:2.96.0-bp160.2.1.noarch —
Vendor Fix
Unresolved product id: openSUSE Leap 16.0:gh-zsh-completion-0:2.96.0-bp160.2.1.noarch —
Vendor Fix
Threats
Impact important

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://www.suse.com/support/security/rating/",
      "text": "important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright 2024 SUSE LLC. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "Security update for gh",
        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "This update for gh fixes the following issues:\n\nChanges in gh:\n\n- CVE-2026-39821: reject all-ASCII xn-- Punycode labels in the vendored\n  golang.org/x/net/idna package regardless of Go\u0027s unicode.Version (boo#1266618).\n",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "openSUSE-Leap-16.0-packagehub-445",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://www.suse.com/support/security/contact/",
      "name": "SUSE Product Security Team",
      "namespace": "https://www.suse.com/"
    },
    "references": [
      {
        "category": "external",
        "summary": "SUSE ratings",
        "url": "https://www.suse.com/support/security/rating/"
      },
      {
        "category": "self",
        "summary": "URL of this CSAF notice",
        "url": "https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_21494-1.json"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1266618",
        "url": "https://bugzilla.suse.com/1266618"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-39821 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-39821/"
      }
    ],
    "title": "Security update for gh",
    "tracking": {
      "current_release_date": "2026-09-17T17:40:48Z",
      "generator": {
        "date": "2026-07-29T09:24:04Z",
        "engine": {
          "name": "cve-database.git:bin/generate-csaf.pl",
          "version": "1"
        }
      },
      "id": "openSUSE-SU-2026:21494-1",
      "initial_release_date": "2026-07-29T09:24:04Z",
      "revision_history": [
        {
          "date": "2026-07-29T09:24:04Z",
          "number": "1",
          "summary": "Current version"
        },
        {
          "date": "2026-09-16T20:43:57Z",
          "number": "2",
          "summary": "unknown changes"
        },
        {
          "date": "2026-09-16T21:45:37Z",
          "number": "3",
          "summary": "unknown changes"
        },
        {
          "date": "2026-09-17T17:40:48Z",
          "number": "4",
          "summary": "unknown changes"
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "gh-0:2.96.0-bp160.2.1.aarch64",
                "product": {
                  "name": "gh-0:2.96.0-bp160.2.1.aarch64",
                  "product_id": "gh-0:2.96.0-bp160.2.1.aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/gh@2.96.0-bp160.2.1?arch=aarch64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "gh-bash-completion-0:2.96.0-bp160.2.1.noarch",
                "product": {
                  "name": "gh-bash-completion-0:2.96.0-bp160.2.1.noarch",
                  "product_id": "gh-bash-completion-0:2.96.0-bp160.2.1.noarch",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/gh-bash-completion@2.96.0-bp160.2.1?arch=noarch"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "gh-fish-completion-0:2.96.0-bp160.2.1.noarch",
                "product": {
                  "name": "gh-fish-completion-0:2.96.0-bp160.2.1.noarch",
                  "product_id": "gh-fish-completion-0:2.96.0-bp160.2.1.noarch",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/gh-fish-completion@2.96.0-bp160.2.1?arch=noarch"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "gh-zsh-completion-0:2.96.0-bp160.2.1.noarch",
                "product": {
                  "name": "gh-zsh-completion-0:2.96.0-bp160.2.1.noarch",
                  "product_id": "gh-zsh-completion-0:2.96.0-bp160.2.1.noarch",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/gh-zsh-completion@2.96.0-bp160.2.1?arch=noarch"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "noarch"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "gh-0:2.96.0-bp160.2.1.ppc64le",
                "product": {
                  "name": "gh-0:2.96.0-bp160.2.1.ppc64le",
                  "product_id": "gh-0:2.96.0-bp160.2.1.ppc64le",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/gh@2.96.0-bp160.2.1?arch=ppc64le"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "ppc64le"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "gh-0:2.96.0-bp160.2.1.s390x",
                "product": {
                  "name": "gh-0:2.96.0-bp160.2.1.s390x",
                  "product_id": "gh-0:2.96.0-bp160.2.1.s390x",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/gh@2.96.0-bp160.2.1?arch=s390x"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "s390x"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "gh-0:2.96.0-bp160.2.1.x86_64",
                "product": {
                  "name": "gh-0:2.96.0-bp160.2.1.x86_64",
                  "product_id": "gh-0:2.96.0-bp160.2.1.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/gh@2.96.0-bp160.2.1?arch=x86_64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_name",
                "name": "openSUSE Leap 16.0",
                "product": {
                  "name": "openSUSE Leap 16.0",
                  "product_id": "openSUSE Leap 16.0"
                }
              }
            ],
            "category": "product_family",
            "name": "SUSE Linux Enterprise"
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "gh-0:2.96.0-bp160.2.1.aarch64 as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.aarch64"
        },
        "product_reference": "gh-0:2.96.0-bp160.2.1.aarch64",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "gh-0:2.96.0-bp160.2.1.ppc64le as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.ppc64le"
        },
        "product_reference": "gh-0:2.96.0-bp160.2.1.ppc64le",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "gh-0:2.96.0-bp160.2.1.s390x as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.s390x"
        },
        "product_reference": "gh-0:2.96.0-bp160.2.1.s390x",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "gh-0:2.96.0-bp160.2.1.x86_64 as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.x86_64"
        },
        "product_reference": "gh-0:2.96.0-bp160.2.1.x86_64",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "gh-bash-completion-0:2.96.0-bp160.2.1.noarch as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:gh-bash-completion-0:2.96.0-bp160.2.1.noarch"
        },
        "product_reference": "gh-bash-completion-0:2.96.0-bp160.2.1.noarch",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "gh-fish-completion-0:2.96.0-bp160.2.1.noarch as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:gh-fish-completion-0:2.96.0-bp160.2.1.noarch"
        },
        "product_reference": "gh-fish-completion-0:2.96.0-bp160.2.1.noarch",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "gh-zsh-completion-0:2.96.0-bp160.2.1.noarch as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:gh-zsh-completion-0:2.96.0-bp160.2.1.noarch"
        },
        "product_reference": "gh-zsh-completion-0:2.96.0-bp160.2.1.noarch",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      }
    ]
  },
  "vulnerabilities": [
    {
      "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 Leap 16.0:gh-0:2.96.0-bp160.2.1.aarch64",
          "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.ppc64le",
          "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.s390x",
          "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.x86_64",
          "openSUSE Leap 16.0:gh-bash-completion-0:2.96.0-bp160.2.1.noarch",
          "openSUSE Leap 16.0:gh-fish-completion-0:2.96.0-bp160.2.1.noarch",
          "openSUSE Leap 16.0:gh-zsh-completion-0:2.96.0-bp160.2.1.noarch"
        ]
      },
      "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 Leap 16.0:gh-0:2.96.0-bp160.2.1.aarch64",
            "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.ppc64le",
            "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.s390x",
            "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.x86_64",
            "openSUSE Leap 16.0:gh-bash-completion-0:2.96.0-bp160.2.1.noarch",
            "openSUSE Leap 16.0:gh-fish-completion-0:2.96.0-bp160.2.1.noarch",
            "openSUSE Leap 16.0:gh-zsh-completion-0:2.96.0-bp160.2.1.noarch"
          ]
        }
      ],
      "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 Leap 16.0:gh-0:2.96.0-bp160.2.1.aarch64",
            "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.ppc64le",
            "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.s390x",
            "openSUSE Leap 16.0:gh-0:2.96.0-bp160.2.1.x86_64",
            "openSUSE Leap 16.0:gh-bash-completion-0:2.96.0-bp160.2.1.noarch",
            "openSUSE Leap 16.0:gh-fish-completion-0:2.96.0-bp160.2.1.noarch",
            "openSUSE Leap 16.0:gh-zsh-completion-0:2.96.0-bp160.2.1.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-07-29T09:24:04Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-39821"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
Events included in the timeline

Loading timeline…


    Loading…

    Loading…

    Loading…

    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.