Vulnerability-Lookup

SUSE-SU-2026:22356-1

Vulnerability from csaf_suse - Published: 2026-06-24 21:39 - Updated: 2026-06-24 21:39

Summary

Security update for python-idna

Severity

Moderate

Notes

Title of the patch: Security update for python-idna

Description of the patch: This update for python-idna fixes the following issue - CVE-2026-45409: specially crafted inputs to idna.encode() can bypass earlier security fix (bsc#1265413).

Patchnames: SUSE-SLES-16.0-1061

CVE-2026-45409

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

Recommended 2 products

Product	Identifier	Version	Remediation
Unresolved product id: SUSE Linux Enterprise Server 16.0:python313-idna-3.10-160000.3.1.noarch		—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:python313-idna-3.10-160000.3.1.noarch		—	Vendor Fix

Threats

Impact moderate

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-updates/2026…	self
https://bugzilla.suse.com/1265413	self
https://www.suse.com/security/cve/CVE-2026-45409/	self
https://www.suse.com/security/cve/CVE-2026-45409	external
https://bugzilla.suse.com/1265413	external

JSON

To clipboard

{
  "document": {
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      "text": "moderate"
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        "category": "description",
        "text": "This update for python-idna fixes the following issue\n\n- CVE-2026-45409: specially crafted inputs to idna.encode() can bypass earlier security fix (bsc#1265413).\n",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "SUSE-SLES-16.0-1061",
        "title": "Patchnames"
      },
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        "category": "legal_disclaimer",
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      },
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      {
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        "url": "https://lists.suse.com/pipermail/sle-updates/2026-July/047783.html"
      },
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        "summary": "SUSE Bug 1265413",
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        "summary": "SUSE CVE CVE-2026-45409 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-45409/"
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    "title": "Security update for python-idna",
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  "vulnerabilities": [
    {
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          "text": "https://www.suse.com/security/cve/CVE-2026-45409"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as `\"\\u0660\" * N` or `\"\\u30fb\" * N + \"\\u6f22\"` utilize the `valid_contexto` function prior to length rejection, and for high values of `N` will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If this length limit is enforced prior to passing the domain to the `idna.encode()` function, it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.",
          "title": "CVE description"
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          "category": "external",
          "summary": "SUSE Bug 1265413 for CVE-2026-45409",
          "url": "https://bugzilla.suse.com/1265413"
        }
      ],
      "remediations": [
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          "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": [
            "SUSE Linux Enterprise Server 16.0:python313-idna-3.10-160000.3.1.noarch",
            "SUSE Linux Enterprise Server for SAP applications 16.0:python313-idna-3.10-160000.3.1.noarch"
          ]
        }
      ],
      "scores": [
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            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise Server 16.0:python313-idna-3.10-160000.3.1.noarch",
            "SUSE Linux Enterprise Server for SAP applications 16.0:python313-idna-3.10-160000.3.1.noarch"
          ]
        }
      ],
      "threats": [
        {
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          "details": "moderate"
        }
      ],
      "title": "CVE-2026-45409"
    }
  ]
}

CVE-2026-45409 (GCVE-0-2026-45409)

Vulnerability from cvelistv5 – Published: 2026-06-05 22:06 – Updated: 2026-06-08 16:34

Title

Internationalized Domain Names in Applications (IDNA): Specially crafted inputs to idna.encode() can bypass CVE-2024-3651 fix

Summary

Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as `"\u0660" * N` or `"\u30fb" * N + "\u6f22"` utilize the `valid_contexto` function prior to length rejection, and for high values of `N` will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If this length limit is enforced prior to passing the domain to the `idna.encode()` function, it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/kjd/idna/security/advisories/G…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
kjd	idna	Affected: < 3.15

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45409",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-08T14:30:54.406761Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-08T16:34:00.295Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "idna",
          "vendor": "kjd",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.15"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as `\"\\u0660\" * N` or `\"\\u30fb\" * N + \"\\u6f22\"` utilize the `valid_contexto` function prior to length rejection, and for high values of `N` will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If this length limit is enforced prior to passing the domain to the `idna.encode()` function, it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1333",
              "description": "CWE-1333: Inefficient Regular Expression Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-05T22:06:07.082Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/kjd/idna/security/advisories/GHSA-65pc-fj4g-8rjx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/kjd/idna/security/advisories/GHSA-65pc-fj4g-8rjx"
        }
      ],
      "source": {
        "advisory": "GHSA-65pc-fj4g-8rjx",
        "discovery": "UNKNOWN"
      },
      "title": "Internationalized Domain Names in Applications (IDNA): Specially crafted inputs to idna.encode() can bypass CVE-2024-3651 fix"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45409",
    "datePublished": "2026-06-05T22:06:07.082Z",
    "dateReserved": "2026-05-12T01:48:40.452Z",
    "dateUpdated": "2026-06-08T16:34:00.295Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

SUSE-SU-2026:22356-1

CVE-2026-45409 (GCVE-0-2026-45409)

Tags

Sightings

Nomenclature