Vulnerability-Lookup

FKIE_CVE-2026-45186

Vulnerability from fkie_nvd - Published: 2026-05-10 07:16 - Updated: 2026-09-16 13:17

Severity

2.9 (Low) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

References

URL	Tags
cve@mitre.org	https://github.com/libexpat/libexpat/pull/1216	Exploit, Issue Tracking, Patch
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/11/16	Mailing List, Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:22715
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:22721
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:23230
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:26319
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:27201
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:29197
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:58981
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-45186
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2468575
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-082556.html
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45186.json

Impacted products

	Vendor	Product	Version
	libexpat_project	libexpat	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "libexpat",
          "vendor": "libexpat project",
          "versions": [
            {
              "lessThan": "2.8.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    },
    {
      "affectedData": [
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          "cpes": [
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          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat",
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              "version": "0:2.7.3-1.el10_2.1",
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          ]
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        {
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          "packageName": "expat",
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          "vendor": "Red Hat",
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              "versionType": "rpm"
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          ]
        },
        {
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          "cpes": [
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            "cpe:/o:redhat:enterprise_linux:9"
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          "packageName": "expat",
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        {
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          "defaultStatus": "affected",
          "packageName": "firefox",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat"
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        {
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          "cpes": [
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          "defaultStatus": "affected",
          "packageName": "compat-expat1",
          "product": "Red Hat Enterprise Linux 6",
          "vendor": "Red Hat"
        },
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          "cpes": [
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          "packageName": "expat",
          "product": "Red Hat Enterprise Linux 6",
          "vendor": "Red Hat"
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:7"
          ],
          "defaultStatus": "affected",
          "packageName": "expat",
          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
        },
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          "vendor": "Red Hat"
        },
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          "packageName": "firefox",
          "product": "Red Hat Enterprise Linux 8",
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        },
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          "packageName": "mingw-expat",
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          "packageName": "xmlrpc-c",
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        },
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      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
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  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1567664C-530C-4589-B1C7-9982976B90F4",
              "versionEndExcluding": "2.8.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input."
    },
    {
      "lang": "es",
      "value": "En libexpat antes de 2.8.1, la complejidad computacional de las comprobaciones de colisi\u00f3n de nombres de atributos permite una denegaci\u00f3n de servicio a trav\u00e9s de una entrada XML manipulada de tama\u00f1o moderado."
    }
  ],
  "id": "CVE-2026-45186",
  "lastModified": "2026-09-16T13:17:58.967",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 2.9,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
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        "source": "cve@mitre.org",
        "type": "Secondary"
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          "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"
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
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        "cvssData": {
          "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"
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        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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        "ssvcData": {
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          "options": [
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            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-11T15:01:28.359121Z",
          "version": "2.0.3"
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      "tags": [
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      "url": "https://access.redhat.com/security/cve/CVE-2026-45186"
    },
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468575"
    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45186.json"
    }
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-407"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-407"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}

CVE-2026-45186 (GCVE-0-2026-45186)

Vulnerability from cvelistv5 – Published: 2026-05-10 06:36 – Updated: 2026-09-16 12:04

Summary

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

Severity

2.9 (Low)


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

7.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-11 15:01 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

mitre mitre root

References

13 references

URL	Tags
https://github.com/libexpat/libexpat/pull/1216
http://www.openwall.com/lists/oss-security/2026/0…
https://access.redhat.com/security/cve/CVE-2026-45186	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2468575	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:22715	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23230	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22721	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29197	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27201	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:58981	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26319	vendor-advisoryx_refsource_REDHAT
https://cert-portal.siemens.com/productcert/html/…

Impacted products

22 products

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.1 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:2.7.3-1.el10_2.1 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:2.5.0-2.el8_10 , < * (rpm) cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.5.0-6.el9_8.1 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat JBoss Core Services 2.4.62.SP4	cpe:/a:redhat:jboss_core_services:1
Red Hat	Red Hat Discovery 2	Unaffected: 1782159791 , < * (rpm) cpe:/a:redhat:discovery:2::el9
Red Hat	Red Hat Discovery 2	Unaffected: 1782166952 , < * (rpm) cpe:/a:redhat:discovery:2::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1781525684 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1781525671 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1781525693 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1781525739 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1787241211 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1787135742 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1787241260 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < V3.1.6 (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < V3.1.6 (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < V3.1.6 (custom)

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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.