SUSE-SU-2026:3421-1

Vulnerability from csaf_suse - Published: 2026-07-30 07:37 - Updated: 2026-09-17 16:37
Summary
Security update for prometheus-ha_cluster_exporter
Severity
Important
Notes
Title of the patch: Security update for prometheus-ha_cluster_exporter
Description of the patch: This update for prometheus-ha_cluster_exporter fixes the following issue: - CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for validation bypass and privilege escalation (bsc#1266552). Other updates and bugfixes: - Release 1.4.2 * Use proper obs time format on changes generation. * Upgrade x/net to 0.57. * Full changelog *: https://github.com/ClusterLabs/ha_cluster_exporter/compare/1.4.1...1.4.2 - Release 1.4.1 * Upgrade to use go 1.25. * Bump github.com/prometheus/common from 0.59.1 to 0.61.0. * Bump golang.org/x/net from 0.33.0 to 0.55.0. * Full changelog: https://github.com/ClusterLabs/ha_cluster_exporter/compare/1.4.0...1.4.1 - Release 1.4.0 * add support to show overall cluster maintenance mode. * add supportconfig plugin (jsc#PED-2560). * update the CI workflow. * change default OBS development project. * bump required Go version to 1.23. * fix corosync collector parser when using IPv6 hostnames (#245). * Bump github.com/prometheus/client_model from 0.3.0 to 0.4.0 . * Bump github.com/prometheus/client_golang from 1.15.0 to 1.15.1 . * Bump github.com/prometheus/common from 0.42.0 to 0.44.0. * Bump github.com/spf13/viper from 1.15.0 to 1.16.0. * Bump github.com/stretchr/testify from 1.8.2 to 1.8.4. * Bump github.com/prometheus/client_golang from 1.15.1 to 1.16.0. * Bump github.com/prometheus/client_golang from 1.16.0 to 1.17.0. * Bump golang.org/x/net from 0.10.0 to 0.17.0. * Bump github.com/prometheus/common from 0.44.0 to 0.55.0. * Bump github.com/spf13/viper from 1.16.0 to 1.19.0. * Bump actions/download-artifact from 3 to 4.1.7. * Bump github.com/prometheus/client_golang from 1.19.1 to 1.20.2. * Bump github.com/prometheus/common from 0.55.0 to 0.59.1. * Bump github.com/prometheus/client_golang from 1.20.2 to 1.20.4. * Bump github.com/prometheus/client_golang from 1.20.4 to 1.20.5. * Bump github.com/stretchr/testify from 1.9.0 to 1.10.0. * Bump golang.org/x/crypto from 0.26.0 to 0.31.0. * Full changelog: https://github.com/ClusterLabs/ha_cluster_exporter/compare/1.3.3...1.4.0
Patchnames: SUSE-2026-3421,SUSE-SLE-SAP-12-SP5-2026-3421
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-39821
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:prometheus-ha_cluster_exporter-0:1.4.2-4.34.1.ppc64le —
Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:prometheus-ha_cluster_exporter-0:1.4.2-4.34.1.x86_64 —
Vendor Fix
Threats
Impact important
References
To clipboard 

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    "distribution": {
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        "title": "Title of the patch"
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        "text": "This update for prometheus-ha_cluster_exporter fixes the following issue:\n\n- CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for validation\n  bypass and privilege escalation (bsc#1266552).\n\nOther updates and bugfixes:\n\n- Release 1.4.2\n  * Use proper obs time format on changes generation.\n  * Upgrade x/net to 0.57.\n  * Full changelog *: https://github.com/ClusterLabs/ha_cluster_exporter/compare/1.4.1...1.4.2\n- Release 1.4.1\n  * Upgrade to use go 1.25.\n  * Bump github.com/prometheus/common from 0.59.1 to 0.61.0.\n  * Bump golang.org/x/net from 0.33.0 to 0.55.0.\n  * Full changelog: https://github.com/ClusterLabs/ha_cluster_exporter/compare/1.4.0...1.4.1\n- Release 1.4.0\n * add support to show overall cluster maintenance mode.\n * add supportconfig plugin (jsc#PED-2560).\n * update the CI workflow.\n * change default OBS development project.\n * bump required Go version to 1.23.\n * fix corosync collector parser when using IPv6 hostnames (#245).\n * Bump github.com/prometheus/client_model from 0.3.0 to 0.4.0 .\n * Bump github.com/prometheus/client_golang from 1.15.0 to 1.15.1 .\n * Bump github.com/prometheus/common from 0.42.0 to 0.44.0.\n * Bump github.com/spf13/viper from 1.15.0 to 1.16.0.\n * Bump github.com/stretchr/testify from 1.8.2 to 1.8.4.\n * Bump github.com/prometheus/client_golang from 1.15.1 to 1.16.0.\n * Bump github.com/prometheus/client_golang from 1.16.0 to 1.17.0.\n * Bump golang.org/x/net from 0.10.0 to 0.17.0.\n * Bump github.com/prometheus/common from 0.44.0 to 0.55.0.\n * Bump github.com/spf13/viper from 1.16.0 to 1.19.0.\n * Bump actions/download-artifact from 3 to 4.1.7.\n * Bump github.com/prometheus/client_golang from 1.19.1 to 1.20.2.\n * Bump github.com/prometheus/common from 0.55.0 to 0.59.1.\n * Bump github.com/prometheus/client_golang from 1.20.2 to 1.20.4.\n * Bump github.com/prometheus/client_golang from 1.20.4 to 1.20.5.\n * Bump github.com/stretchr/testify from 1.9.0 to 1.10.0.\n * Bump golang.org/x/crypto from 0.26.0 to 0.31.0.\n * Full changelog: https://github.com/ClusterLabs/ha_cluster_exporter/compare/1.3.3...1.4.0\n",
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        "url": "https://lists.suse.com/pipermail/sle-updates/2026-July/048957.html"
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  "vulnerabilities": [
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      "ids": [
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          "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"
        }
      ],
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-07-30T07:37:12Z",
          "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.


Detection rules are retrieved from Rulezet.


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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.