RHSA-2026:37535

Vulnerability from csaf_redhat - Published: 2026-07-10 04:16 - Updated: 2026-07-10 18:37
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: python3.13: * python3.13-3.13.14-1.3.hum1 (aarch64, x86_64) * python3.13-debug-3.13.14-1.3.hum1 (aarch64, x86_64) * python3.13-devel-3.13.14-1.3.hum1 (aarch64, x86_64) * python3.13-freethreading-3.13.14-1.3.hum1 (aarch64, x86_64) * python3.13-freethreading-debug-3.13.14-1.3.hum1 (aarch64, x86_64) * python3.13-idle-3.13.14-1.3.hum1 (aarch64, x86_64) * python3.13-libs-3.13.14-1.3.hum1 (aarch64, x86_64) * python3.13-test-3.13.14-1.3.hum1 (aarch64, x86_64) * python3.13-tkinter-3.13.14-1.3.hum1 (aarch64, x86_64) * python3.13-3.13.14-1.3.hum1.src (src) Security Fix(es): python3.13: * CVE-2026-15308
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-2026-15308

A flaw was found in Python. Its incremental HTML parser can be exploited by a remote attacker. By sending specially crafted, uncontrolled data with repeated, incomplete markup declarations, the attacker can cause the system to consume excessive central processing unit (CPU) resources. This leads to a denial of service, making the affected system 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 ('Infinite Loop')
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:python3-13-main@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:python3-13-main@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:python3-13-main@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

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        "text": "An update for Red Hat Hardened Images RPMs is now available.",
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        "text": "This update includes the following RPMs:\n\npython3.13:\n  * python3.13-3.13.14-1.3.hum1 (aarch64, x86_64)\n  * python3.13-debug-3.13.14-1.3.hum1 (aarch64, x86_64)\n  * python3.13-devel-3.13.14-1.3.hum1 (aarch64, x86_64)\n  * python3.13-freethreading-3.13.14-1.3.hum1 (aarch64, x86_64)\n  * python3.13-freethreading-debug-3.13.14-1.3.hum1 (aarch64, x86_64)\n  * python3.13-idle-3.13.14-1.3.hum1 (aarch64, x86_64)\n  * python3.13-libs-3.13.14-1.3.hum1 (aarch64, x86_64)\n  * python3.13-test-3.13.14-1.3.hum1 (aarch64, x86_64)\n  * python3.13-tkinter-3.13.14-1.3.hum1 (aarch64, x86_64)\n  * python3.13-3.13.14-1.3.hum1.src (src)\n\nSecurity Fix(es):\n\npython3.13:\n  * CVE-2026-15308",
        "title": "Details"
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    {
      "cve": "CVE-2026-15308",
      "cwe": {
        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
      },
      "discovery_date": "2026-07-09T18:02:10.090070+00:00",
      "ids": [
        {
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          "text": "2498608"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Python. Its incremental HTML parser can be exploited by a remote attacker. By sending specially crafted, uncontrolled data with repeated, incomplete markup declarations, the attacker can cause the system to consume excessive central processing unit (CPU) resources. This leads to a denial of service, making the affected system unresponsive.",
          "title": "Vulnerability description"
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          "text": "python: Python: CPU Denial of Service in HTML parser via repeated unterminated markup declarations",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important vulnerability in Python\u0027s `html.parser.HTMLParser` can lead to a denial of service. By supplying specially crafted, malformed HTML with repeated unterminated markup declarations, an attacker can cause excessive CPU consumption, rendering the system unresponsive. Red Hat products utilizing this parser to process untrusted HTML content are susceptible to resource exhaustion.",
          "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"
        }
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        {
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        {
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        {
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          "summary": "https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd",
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          "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/"
        }
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      "release_date": "2026-07-09T17:10:57.317000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-10T04:16:02+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:python3-13-main@aarch64",
            "Red Hat Hardened Images:python3-13-main@src",
            "Red Hat Hardened Images:python3-13-main@x86_64"
          ],
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          },
          "url": "https://access.redhat.com/errata/RHSA-2026:37535"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
          "product_ids": [
            "Red Hat Hardened Images:python3-13-main@aarch64",
            "Red Hat Hardened Images:python3-13-main@src",
            "Red Hat Hardened Images:python3-13-main@x86_64"
          ]
        }
      ],
      "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": [
            "Red Hat Hardened Images:python3-13-main@aarch64",
            "Red Hat Hardened Images:python3-13-main@src",
            "Red Hat Hardened Images:python3-13-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "python: Python: CPU Denial of Service in HTML parser via repeated unterminated markup declarations"
    }
  ]
}



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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.