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High

Security advisory

Type: advisorySources: OSVCVE: CVE-2022-45061

An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname. For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2022-45061
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 04:01 UTC · Revision 1

Source evidence

CVE-2022-45061

core-osv · Original source

Published 9 Nov 2022, 00:00 UTC

An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname. For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16.

osv:CVE-2022-45061
Complete source record
{
  "id": "2e46853949a0acd044bae1b4cd7c2b626649f1d8287a2be984049300e98aff5a",
  "url": "https://osv.dev/vulnerability/CVE-2022-45061",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2022-45061",
    "summary": "An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname. For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16.",
    "evidence": "osv:CVE-2022-45061",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-45061",
      "aliases": [
        "BIT-libpython-2022-45061",
        "BIT-python-2022-45061",
        "BIT-python-min-2022-45061",
        "CVE-2022-45061",
        "PSF-2022-10"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/python/cpython",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a7a450f84a087421603170c2dad226bb881d4d9a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.11.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
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          "versions": [
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-45061.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.892718964Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-806742.html",
        "https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html",
        "https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/45xxx/CVE-2022-45061.json",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2AOUKI72ACV6CHY2QUFO6VK2DNMVJ2MB/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35YDIWCUMWTMDBWFRAVENFH6BLB65D6S/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4WBZJNSALFGMPYTINIF57HAAK46U72WQ/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/63FS6VHY4DCS74HBTEINUDOECQ2X6ZCH/",
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        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B4MYQ3IV6NWA4CKSXEHW45CH2YNDHEPH/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BWJREJHWVRBYDP43YB5WRL3QC7UBA7BR/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GTPVDZDATRQFE6KAT6B4BQIQ4GRHIIIJ/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IN26PWZTYG6IF3APLRXQJBVACQHZUPT2/",
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        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LKWAMPURWUV3DCCT4J7VHRF4NT2CFVBR/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O67LRHDTJWH544KXB6KY4HMHQLYDXFPK/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORVCQGJCCAVLN4DJDTWGREFCUWXKQRML/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLQ2BNZVBBAQPV3SPRU24ZD37UYJJS7W/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QCKD4AFBHXIMHS64ZER2U7QRT33HNE7L/",
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        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH57BNT4VQERGEJ5SXNXSVMDYP66YD4H/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTN2OOLKYTG34DODUEJGT5MLC2PFGPBA/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T3D5TX4TDJPXHXD2QICKTY3OCQC3JARP/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UHVW73QZJMHA4MK7JBT7CXX7XSNYQEGF/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VCMDX6IFKLOA3NXUQEV524L5LHTPI2JI/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3EJ6J7PXVQOULBQZQGBXCXY6LFF6LZD/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XXZJL3CNAFS5PAIR7K4RL62S3Y7THR7O/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YPNWZKXPKTNHS5FVMN7UQZ2UPCSEFJUK/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZB5YCMIRVX35RUB6XPOWKENCVCJEVDRK/",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-45061",
        "https://security.gentoo.org/glsa/202305-02",
        "https://security.netapp.com/advisory/ntap-20221209-0007/",
        "https://github.com/python/cpython/issues/98433",
        "https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html",
        "https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/45xxx/CVE-2022-45061.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-45061",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492361,
  "published_at": "2022-11-09T00:00:00+00:00"
}