Vulnerability-Lookup

OESA-2026-2210 (CVE-2026-5673)

Vulnerability from osv_openeuler – Published: 2026-05-09 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

libtheora security update

Details

Theora is a free and open video compression format from the Xiph.org Foundation. Like all our multimedia technology it can be used to distribute film and video online and on disc without the licensing and royalty fees or vendor lock-in associated with other formats.

Security Fix(es):

A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap.(CVE-2026-5673)

Severity

5.6 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-5673	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libtheora-1.1.1-26.oe2003sp4.aarch64.rpm",
          "libtheora-debuginfo-1.1.1-26.oe2003sp4.aarch64.rpm",
          "libtheora-debugsource-1.1.1-26.oe2003sp4.aarch64.rpm",
          "libtheora-devel-1.1.1-26.oe2003sp4.aarch64.rpm",
          "theora-tools-1.1.1-26.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "libtheora-help-1.1.1-26.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "libtheora-1.1.1-26.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "libtheora-1.1.1-26.oe2003sp4.x86_64.rpm",
          "libtheora-debuginfo-1.1.1-26.oe2003sp4.x86_64.rpm",
          "libtheora-debugsource-1.1.1-26.oe2003sp4.x86_64.rpm",
          "libtheora-devel-1.1.1-26.oe2003sp4.x86_64.rpm",
          "theora-tools-1.1.1-26.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "libtheora",
        "purl": "pkg:rpm/openEuler/libtheora\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.1-26.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libtheora-1.1.1-27.oe2203sp4.aarch64.rpm",
          "libtheora-debuginfo-1.1.1-27.oe2203sp4.aarch64.rpm",
          "libtheora-debugsource-1.1.1-27.oe2203sp4.aarch64.rpm",
          "libtheora-devel-1.1.1-27.oe2203sp4.aarch64.rpm",
          "theora-tools-1.1.1-27.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
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          "libtheora-1.1.1-27.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "libtheora-1.1.1-27.oe2203sp4.x86_64.rpm",
          "libtheora-debuginfo-1.1.1-27.oe2203sp4.x86_64.rpm",
          "libtheora-debugsource-1.1.1-27.oe2203sp4.x86_64.rpm",
          "libtheora-devel-1.1.1-27.oe2203sp4.x86_64.rpm",
          "theora-tools-1.1.1-27.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "libtheora",
        "purl": "pkg:rpm/openEuler/libtheora\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.1-27.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libtheora-1.1.1-29.oe2403.aarch64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403.aarch64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403.aarch64.rpm",
          "libtheora-devel-1.1.1-29.oe2403.aarch64.rpm",
          "theora-tools-1.1.1-29.oe2403.aarch64.rpm",
          "libtheora-1.1.1-29.oe2403sp1.aarch64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403sp1.aarch64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403sp1.aarch64.rpm",
          "libtheora-devel-1.1.1-29.oe2403sp1.aarch64.rpm",
          "theora-tools-1.1.1-29.oe2403sp1.aarch64.rpm",
          "libtheora-1.1.1-29.oe2403sp3.aarch64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403sp3.aarch64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403sp3.aarch64.rpm",
          "libtheora-devel-1.1.1-29.oe2403sp3.aarch64.rpm",
          "theora-tools-1.1.1-29.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "libtheora-help-1.1.1-29.oe2403.noarch.rpm",
          "libtheora-help-1.1.1-29.oe2403sp1.noarch.rpm",
          "libtheora-help-1.1.1-29.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "libtheora-1.1.1-29.oe2403.src.rpm",
          "libtheora-1.1.1-29.oe2403sp1.src.rpm",
          "libtheora-1.1.1-29.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "libtheora-1.1.1-29.oe2403.x86_64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403.x86_64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403.x86_64.rpm",
          "libtheora-devel-1.1.1-29.oe2403.x86_64.rpm",
          "theora-tools-1.1.1-29.oe2403.x86_64.rpm",
          "libtheora-1.1.1-29.oe2403sp1.x86_64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403sp1.x86_64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403sp1.x86_64.rpm",
          "libtheora-devel-1.1.1-29.oe2403sp1.x86_64.rpm",
          "theora-tools-1.1.1-29.oe2403sp1.x86_64.rpm",
          "libtheora-1.1.1-29.oe2403sp3.x86_64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403sp3.x86_64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403sp3.x86_64.rpm",
          "libtheora-devel-1.1.1-29.oe2403sp3.x86_64.rpm",
          "theora-tools-1.1.1-29.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS",
        "name": "libtheora",
        "purl": "pkg:rpm/openEuler/libtheora\u0026distro=openEuler-24.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.1-29.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libtheora-1.1.1-29.oe2403sp1.aarch64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403sp1.aarch64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403sp1.aarch64.rpm",
          "libtheora-devel-1.1.1-29.oe2403sp1.aarch64.rpm",
          "theora-tools-1.1.1-29.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "libtheora-help-1.1.1-29.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "libtheora-1.1.1-29.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "libtheora-1.1.1-29.oe2403sp1.x86_64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403sp1.x86_64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403sp1.x86_64.rpm",
          "libtheora-devel-1.1.1-29.oe2403sp1.x86_64.rpm",
          "theora-tools-1.1.1-29.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "libtheora",
        "purl": "pkg:rpm/openEuler/libtheora\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.1-29.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libtheora-1.1.1-29.oe2403sp3.aarch64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403sp3.aarch64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403sp3.aarch64.rpm",
          "libtheora-devel-1.1.1-29.oe2403sp3.aarch64.rpm",
          "theora-tools-1.1.1-29.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "libtheora-help-1.1.1-29.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "libtheora-1.1.1-29.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "libtheora-1.1.1-29.oe2403sp3.x86_64.rpm",
          "libtheora-debuginfo-1.1.1-29.oe2403sp3.x86_64.rpm",
          "libtheora-debugsource-1.1.1-29.oe2403sp3.x86_64.rpm",
          "libtheora-devel-1.1.1-29.oe2403sp3.x86_64.rpm",
          "theora-tools-1.1.1-29.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "libtheora",
        "purl": "pkg:rpm/openEuler/libtheora\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
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            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.1-29.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Theora is a free and open video compression format from the Xiph.org Foundation. Like all our multimedia technology it can be used to distribute film and video online and on disc without the licensing and royalty fees or vendor lock-in associated with other formats.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap.(CVE-2026-5673)",
  "id": "OESA-2026-2210",
  "modified": "2026-08-06T11:11:11Z",
  "published": "2026-05-09T11:11:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2210"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5673"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libtheora security update",
  "upstream": [
    "CVE-2026-5673"
  ]
}

CVE-2026-5673 (GCVE-0-2026-5673)

Vulnerability from cvelistv5 – Published: 2026-04-06 09:22 – Updated: 2026-05-01 20:03

Title

Libtheora: libtheora: denial of service or information disclosure via malformed avi file processing

Summary

Severity

5.6 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-06 17:50 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

redhat redhat root

References

3 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-5673	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2455340	issue-trackingx_refsource_REDHAT
https://github.com/xiph/theora/issues/24

Impacted products

5 products

Vendor	Product	Version
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

Date Public

2026-04-06 09:16

Credits

Red Hat would like to thank ChenZhengzhe (HangZhouDianZi University) for reporting this issue.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5673",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-06T17:50:45.440733Z",
                "version": "2.0.3"
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              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2026-04-06T18:02:52.708Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
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        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10"
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          "defaultStatus": "affected",
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          "product": "Red Hat Enterprise Linux 10",
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      "metrics": [
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        },
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        {
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          "value": "To mitigate this issue, users should avoid opening untrusted AVI files. Exercise caution when handling AVI files from unknown or suspicious sources."
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    "datePublished": "2026-04-06T09:22:36.227Z",
    "dateReserved": "2026-04-06T09:07:22.895Z",
    "dateUpdated": "2026-05-01T20:03:09.519Z",
    "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.

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.