Vulnerability-Lookup

OESA-2026-3403 (CVE-2026-72522)

Vulnerability from osv_openeuler – Published: 2026-08-20 09:54 – Updated: 2026-08-20 09:54 – Source website

Summary

expat security update

Details

expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial.

Security Fix(es):

libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.(CVE-2026-72522)

Severity

6.2 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-72522	ADVISORY

JSON

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{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "expat-2.8.1-5.oe2403sp4.aarch64.rpm",
          "expat-debuginfo-2.8.1-5.oe2403sp4.aarch64.rpm",
          "expat-debugsource-2.8.1-5.oe2403sp4.aarch64.rpm",
          "expat-devel-2.8.1-5.oe2403sp4.aarch64.rpm"
        ],
        "noarch": [
          "expat-help-2.8.1-5.oe2403sp4.noarch.rpm"
        ],
        "src": [
          "expat-2.8.1-5.oe2403sp4.src.rpm"
        ],
        "x86_64": [
          "expat-2.8.1-5.oe2403sp4.x86_64.rpm",
          "expat-debuginfo-2.8.1-5.oe2403sp4.x86_64.rpm",
          "expat-debugsource-2.8.1-5.oe2403sp4.x86_64.rpm",
          "expat-devel-2.8.1-5.oe2403sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP4",
        "name": "expat",
        "purl": "pkg:rpm/openEuler/expat\u0026distro=openEuler-24.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.8.1-5.oe2403sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "expat-2.2.9-29.oe2003sp4.aarch64.rpm",
          "expat-debuginfo-2.2.9-29.oe2003sp4.aarch64.rpm",
          "expat-debugsource-2.2.9-29.oe2003sp4.aarch64.rpm",
          "expat-devel-2.2.9-29.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "expat-help-2.2.9-29.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "expat-2.2.9-29.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "expat-2.2.9-29.oe2003sp4.x86_64.rpm",
          "expat-debuginfo-2.2.9-29.oe2003sp4.x86_64.rpm",
          "expat-debugsource-2.2.9-29.oe2003sp4.x86_64.rpm",
          "expat-devel-2.2.9-29.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "expat",
        "purl": "pkg:rpm/openEuler/expat\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.9-29.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "expat-2.4.1-28.oe2203sp4.aarch64.rpm",
          "expat-debuginfo-2.4.1-28.oe2203sp4.aarch64.rpm",
          "expat-debugsource-2.4.1-28.oe2203sp4.aarch64.rpm",
          "expat-devel-2.4.1-28.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "expat-help-2.4.1-28.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "expat-2.4.1-28.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "expat-2.4.1-28.oe2203sp4.x86_64.rpm",
          "expat-debuginfo-2.4.1-28.oe2203sp4.x86_64.rpm",
          "expat-debugsource-2.4.1-28.oe2203sp4.x86_64.rpm",
          "expat-devel-2.4.1-28.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "expat",
        "purl": "pkg:rpm/openEuler/expat\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.1-28.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "expat-2.5.0-24.oe2403sp1.aarch64.rpm",
          "expat-debuginfo-2.5.0-24.oe2403sp1.aarch64.rpm",
          "expat-debugsource-2.5.0-24.oe2403sp1.aarch64.rpm",
          "expat-devel-2.5.0-24.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "expat-help-2.5.0-24.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "expat-2.5.0-24.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "expat-2.5.0-24.oe2403sp1.x86_64.rpm",
          "expat-debuginfo-2.5.0-24.oe2403sp1.x86_64.rpm",
          "expat-debugsource-2.5.0-24.oe2403sp1.x86_64.rpm",
          "expat-devel-2.5.0-24.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "expat",
        "purl": "pkg:rpm/openEuler/expat\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.0-24.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "expat-2.5.0-24.oe2403sp3.aarch64.rpm",
          "expat-debuginfo-2.5.0-24.oe2403sp3.aarch64.rpm",
          "expat-debugsource-2.5.0-24.oe2403sp3.aarch64.rpm",
          "expat-devel-2.5.0-24.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "expat-help-2.5.0-24.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "expat-2.5.0-24.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "expat-2.5.0-24.oe2403sp3.x86_64.rpm",
          "expat-debuginfo-2.5.0-24.oe2403sp3.x86_64.rpm",
          "expat-debugsource-2.5.0-24.oe2403sp3.x86_64.rpm",
          "expat-devel-2.5.0-24.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "expat",
        "purl": "pkg:rpm/openEuler/expat\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.0-24.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial.\r\n\r\nSecurity Fix(es):\n\nlibexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.(CVE-2026-72522)",
  "id": "OESA-2026-3403",
  "modified": "2026-08-20T09:54:26Z",
  "published": "2026-08-20T09:54:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3403"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72522"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "expat security update",
  "upstream": [
    "CVE-2026-72522"
  ]
}

CVE-2026-72522 (GCVE-0-2026-72522)

Vulnerability from cvelistv5 – Published: 2026-08-10 03:28 – Updated: 2026-08-13 14:08

Summary

libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.

Severity

6.2 (Medium)


                        
                          CVSS:3.1/AV:L/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 2026-08-13 12:39 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

mitre mitre root

References

3 references

URL	Tags
https://github.com/libexpat/libexpat/pull/1296
https://bugzilla.mozilla.org/show_bug.cgi?id=2053153
http://www.openwall.com/lists/oss-security/2026/08/11/5

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.3 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-08-11T17:20:04.291Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/08/11/5"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-72522",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-13T12:39:09.978860Z",
                "version": "2.0.3"
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        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "libexpat",
          "vendor": "libexpat project",
          "versions": [
            {
              "lessThan": "2.8.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
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      ],
      "cpeApplicability": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*",
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      "descriptions": [
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      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.2,
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            "confidentialityImpact": "NONE",
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    "datePublished": "2026-08-10T03:28:04.274Z",
    "dateReserved": "2026-08-10T03:28:03.899Z",
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    "state": "PUBLISHED"
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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.