OPENSUSE-SU-2026:20827-1

Vulnerability from csaf_opensuse - Published: 2026-05-28 12:07 - Updated: 2026-05-28 12:07
Summary
Security update for python-mistune
Severity
Important
Notes
Title of the patch: Security update for python-mistune
Description of the patch: This update for python-mistune fixes the following issues - CVE-2026-33079: ReDoS in `LINK_TITLE_RE` can lead to denial of service via a crafted Markdown (bsc#1264347). - CVE-2026-33441: processing of malformed reference links can lead to excessive resource consumption and denial of service (bsc#1264752). - CVE-2026-44708: improper HTML escaping in the math plugin can lead to XSS (bsc#1264751). - CVE-2026-44896: improper escaping in `render_figure` can lead to attribute injection and XSS (bsc#1264754). - CVE-2026-44897: improper sanitization of user-controlled input in `HTMLRenderer.heading` can lead to XSS (bsc#1264750). - CVE-2026-44898: improper sanitization of user-supplied HTML input in `render_toc_ul` can lead to XSS (bsc#1265052). - CVE-2026-44899: improper input verification in Image directive plugin and improper escaping in `render_block_image` can lead to CSS injection (bsc#1265053).
Patchnames: openSUSE-Leap-16.0-816
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-2026-33079
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch —
Vendor Fix
Threats
Impact important
CVE-2026-33441
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch —
Vendor Fix
Threats
Impact important
CVE-2026-44708
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch —
Vendor Fix
Threats
Impact moderate
CVE-2026-44896
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch —
Vendor Fix
Threats
Impact moderate
CVE-2026-44897
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch —
Vendor Fix
Threats
Impact moderate
CVE-2026-44898
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch —
Vendor Fix
Threats
Impact moderate
CVE-2026-44899
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch —
Vendor Fix
Threats
Impact moderate
References
To clipboard 

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          "category": "general",
          "text": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_toc_ul() builds a \u003cul\u003e table-of-contents tree from a list of (level, id, text) tuples. Both the id value (used as href=\"#\u003cid\u003e\") and the text value (used as the visible link label) are inserted into \u003ca\u003e tags via a plain Python format string - with no HTML escaping applied to either value. When heading IDs are derived from user-supplied heading text (the standard use-case for readable slug anchors), an attacker can craft a heading whose text breaks out of the href=\"#...\" attribute context, injecting arbitrary HTML tags including \u003cscript\u003e blocks directly into the rendered TOC. This vulnerability is fixed in 3.2.1.",
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        {
          "category": "external",
          "summary": "CVE-2026-44898",
          "url": "https://www.suse.com/security/cve/CVE-2026-44898"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1265052 for CVE-2026-44898",
          "url": "https://bugzilla.suse.com/1265052"
        }
      ],
      "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:python313-mistune-3.1.3-160000.3.1.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-28T12:07:59Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-44898"
    },
    {
      "cve": "CVE-2026-44899",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-44899"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the Image directive plugin validates the :width: and :height: options with a regex compiled as _num_re = re.compile(r\"^\\d+(?:\\.\\d*)?\"). When the validated value is not a plain integer, render_block_image() inserts it directly into a style=\"width:...;\" or style=\"height:...;\" attribute. Because the value was accepted by the prefix-only regex, any CSS after the leading digits reaches the style= attribute verbatim and without escaping. This vulnerability is fixed in 3.2.1.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-44899",
          "url": "https://www.suse.com/security/cve/CVE-2026-44899"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1265053 for CVE-2026-44899",
          "url": "https://bugzilla.suse.com/1265053"
        }
      ],
      "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:python313-mistune-3.1.3-160000.3.1.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-28T12:07:59Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-44899"
    }
  ]
}


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Tags
Taxonomy of the tags.





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.