Vulnerability-Lookup

CVE-2026-73066 (GCVE-0-2026-73066)

Vulnerability from cvelistv5 – Published: 2026-08-11 14:49 – Updated: 2026-08-11 15:36

Title

Tesseract: Heap out-of-bounds write in LSTM Convolve layer via crafted .traineddata

Summary

Tesseract is an open source OCR engine. Prior to 5.5.3, a crafted .traineddata LSTM model component loaded through Tesseract's deserializer can cause an unchecked signed integer multiplication in Convolve::DeSerialize in src/lstm/convolve.cpp to wrap the convolution output-channel count, undersizing the forward-pass output buffer while writes use the unwrapped element count and causing a heap out-of-bounds write during OCR recognition. This issue is fixed in version 5.5.3.

Severity

6.8 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-11 15:31 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/tesseract-ocr/tesseract/securi…	x_refsource_CONFIRM
https://github.com/tesseract-ocr/tesseract/pull/4588	x_refsource_MISC
https://github.com/tesseract-ocr/tesseract/commit…	x_refsource_MISC
https://github.com/tesseract-ocr/tesseract/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
tesseract-ocr	tesseract	Affected: < 5.5.3	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-73066",
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      "title": "Tesseract: Heap out-of-bounds write in LSTM Convolve layer via crafted .traineddata"
    }
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      "title": "tesseract: Tesseract: Heap out-of-bounds write via crafted .traineddata",
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}

alsa-2026:67832

Vulnerability from osv_almalinux

Published

2026-09-16 00:00

Modified

2026-09-16 11:28

Summary

Important: tesseract security update

Details

A commercial quality OCR engine originally developed at HP between 1985 and 1995. In 1995, this engine was among the top 3 evaluated by UNLV. It was open-sourced by HP and UNLV in 2005.

Security Fix(es):

tesseract: Tesseract: Heap out-of-bounds write via crafted .traineddata (CVE-2026-73066)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:67832	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-73066	REPORT
	https://bugzilla.redhat.com/2514011	REPORT
	https://errata.almalinux.org/8/ALSA-2026-67832.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tesseract"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.1-3.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tesseract-devel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.1-3.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "A commercial quality OCR engine originally developed at HP between 1985 and 1995. In 1995, this engine was among the top 3 evaluated by UNLV. It was open-sourced by HP and UNLV in 2005.  \n\nSecurity Fix(es):  \n\n  * tesseract: Tesseract: Heap out-of-bounds write via crafted .traineddata (CVE-2026-73066)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:67832",
  "modified": "2026-09-16T11:28:05Z",
  "published": "2026-09-16T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:67832"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-73066"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2514011"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2026-67832.html"
    }
  ],
  "related": [
    "CVE-2026-73066"
  ],
  "summary": "Important: tesseract security update"
}

FKIE_CVE-2026-73066

Vulnerability from fkie_nvd - Published: 2026-08-11 15:17 - Updated: 2026-09-09 20:46

Severity

6.8 (Medium) - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/tesseract-ocr/tesseract/commit/2f4d2f4bf45c363785d7bf1da29b6628f8939a72
	security-advisories@github.com	https://github.com/tesseract-ocr/tesseract/pull/4588
	security-advisories@github.com	https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.3
	security-advisories@github.com	https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7j76-5rq5-5jg8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "tesseract",
          "vendor": "tesseract-ocr",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.5.3"
            }
          ]
        }
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    }
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    {
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      "value": "Tesseract is an open source OCR engine. Prior to 5.5.3, a crafted .traineddata LSTM model component loaded through Tesseract\u0027s deserializer can cause an unchecked signed integer multiplication in Convolve::DeSerialize in src/lstm/convolve.cpp to wrap the convolution output-channel count, undersizing the forward-pass output buffer while writes use the unwrapped element count and causing a heap out-of-bounds write during OCR recognition. This issue is fixed in version 5.5.3."
    }
  ],
  "id": "CVE-2026-73066",
  "lastModified": "2026-09-09T20:46:02.457",
  "metrics": {
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        "cvssData": {
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          "Safety": "NOT_DEFINED",
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          "attackRequirements": "NONE",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
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        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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  "published": "2026-08-11T15:17:38.777",
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      "url": "https://github.com/tesseract-ocr/tesseract/commit/2f4d2f4bf45c363785d7bf1da29b6628f8939a72"
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    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/tesseract-ocr/tesseract/pull/4588"
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    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7j76-5rq5-5jg8"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

RHSA-2026:67830

Vulnerability from csaf_redhat - Published: 2026-09-16 07:19 - Updated: 2026-09-16 12:06

Summary

Red Hat Security Advisory: tesseract security update

Severity

Important

Scope

1 vulnerability in this advisory, including CVE-2026-73066.

CVE-2026-73066

A flaw was found in Tesseract, an open-source Optical Character Recognition (OCR) engine. A remote attacker could exploit this by providing a specially crafted .traineddata LSTM model component. When Tesseract's deserializer processes this component during OCR recognition, an unchecked integer multiplication can occur, leading to an undersized buffer and a heap out-of-bounds write. This vulnerability could result in a denial of service or potentially arbitrary code execution.

7.1 (High)


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

Fixed: 33 products

https://access.redhat.com/errata/RHSA-2026:67830

Open the full advisory

RHSA-2026:67832

Vulnerability from csaf_redhat - Published: 2026-09-16 07:15 - Updated: 2026-09-16 12:06

Summary

Red Hat Security Advisory: tesseract security update

Severity

Important

Scope

1 vulnerability in this advisory, including CVE-2026-73066.

CVE-2026-73066

7.1 (High)


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

Fixed: 31 products

https://access.redhat.com/errata/RHSA-2026:67832

Open the full advisory

ubuntu-cve-2026-73066

Vulnerability from osv_ubuntu

Published

2026-08-11 15:17

Modified

2026-08-19 11:11

Summary

Details

Severity

6.8 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-73066	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-73066	REPORT
	https://github.com/tesseract-ocr/tesseract/securi…	REPORT
	https://github.com/tesseract-ocr/tesseract/pull/4588	REPORT
	https://github.com/tesseract-ocr/tesseract/commit…	REPORT
	https://github.com/tesseract-ocr/tesseract/releas…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtesseract3",
            "binary_version": "3.03.02-3"
          },
          {
            "binary_name": "tesseract-ocr",
            "binary_version": "3.03.02-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "tesseract",
        "purl": "pkg:deb/ubuntu/tesseract@3.03.02-3?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.02.02-1",
        "3.03.02-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtesseract3",
            "binary_version": "3.04.01-4"
          },
          {
            "binary_name": "tesseract-ocr",
            "binary_version": "3.04.01-4"
          },
          {
            "binary_name": "tesseract-ocr-all",
            "binary_version": "3.04.01-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "tesseract",
        "purl": "pkg:deb/ubuntu/tesseract@3.04.01-4?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.04.00-5ubuntu1",
        "3.04.01-2",
        "3.04.01-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtesseract4",
            "binary_version": "4.00~git2288-10f4998a-2"
          },
          {
            "binary_name": "tesseract-ocr",
            "binary_version": "4.00~git2288-10f4998a-2"
          },
          {
            "binary_name": "tesseract-ocr-all",
            "binary_version": "4.00~git2288-10f4998a-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "tesseract",
        "purl": "pkg:deb/ubuntu/tesseract@4.00~git2288-10f4998a-2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.04.01-6",
        "3.04.01-6build1",
        "3.04.01-6build2",
        "4.00~git2188-cdc35338-4build1",
        "4.00~git2188-cdc35338-5",
        "4.00~git2207-766b7bd6-3.1",
        "4.00~git2219-40f43111-1.2",
        "4.00~git2288-10f4998a-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtesseract4",
            "binary_version": "4.1.1-2build2"
          },
          {
            "binary_name": "tesseract-ocr",
            "binary_version": "4.1.1-2build2"
          },
          {
            "binary_name": "tesseract-ocr-all",
            "binary_version": "4.1.1-2build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "tesseract",
        "purl": "pkg:deb/ubuntu/tesseract@4.1.1-2build2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.1.0-1",
        "4.1.0-2",
        "4.1.1-1",
        "4.1.1-2",
        "4.1.1-2build1",
        "4.1.1-2build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtesseract4",
            "binary_version": "4.1.1-2.1build1"
          },
          {
            "binary_name": "tesseract-ocr",
            "binary_version": "4.1.1-2.1build1"
          },
          {
            "binary_name": "tesseract-ocr-all",
            "binary_version": "4.1.1-2.1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "tesseract",
        "purl": "pkg:deb/ubuntu/tesseract@4.1.1-2.1build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.1.1-2.1",
        "4.1.1-2.1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtesseract5",
            "binary_version": "5.3.4-1build5"
          },
          {
            "binary_name": "tesseract-ocr",
            "binary_version": "5.3.4-1build5"
          },
          {
            "binary_name": "tesseract-ocr-all",
            "binary_version": "5.3.4-1build5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "tesseract",
        "purl": "pkg:deb/ubuntu/tesseract@5.3.4-1build5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.3.0-2build1",
        "5.3.3-1",
        "5.3.3-1build1",
        "5.3.4-1",
        "5.3.4-1build3",
        "5.3.4-1build4",
        "5.3.4-1build5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtesseract5",
            "binary_version": "5.5.0-1build1"
          },
          {
            "binary_name": "tesseract-ocr",
            "binary_version": "5.5.0-1build1"
          },
          {
            "binary_name": "tesseract-ocr-all",
            "binary_version": "5.5.0-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "tesseract",
        "purl": "pkg:deb/ubuntu/tesseract@5.5.0-1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.5.0-1",
        "5.5.0-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "Tesseract is an open source OCR engine. Prior to 5.5.3, a crafted .traineddata LSTM model component loaded through Tesseract\u0027s deserializer can cause an unchecked signed integer multiplication in Convolve::DeSerialize in src/lstm/convolve.cpp to wrap the convolution output-channel count, undersizing the forward-pass output buffer while writes use the unwrapped element count and causing a heap out-of-bounds write during OCR recognition. This issue is fixed in version 5.5.3.",
  "id": "UBUNTU-CVE-2026-73066",
  "modified": "2026-08-19T11:11:14Z",
  "published": "2026-08-11T15:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-73066"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-73066"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7j76-5rq5-5jg8"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tesseract-ocr/tesseract/pull/4588"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tesseract-ocr/tesseract/commit/2f4d2f4bf45c363785d7bf1da29b6628f8939a72"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.3"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-73066"
  ]
}

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.

Action not permitted

CVE-2026-73066 (GCVE-0-2026-73066)

alsa-2026:67832

Vulnerability from osv_almalinux

FKIE_CVE-2026-73066

RHSA-2026:67830

RHSA-2026:67832

ubuntu-cve-2026-73066

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour