Vulnerability-Lookup

CVE-2026-88049 (GCVE-0-2026-88049)

Vulnerability from cvelistv5 – Published: 2026-09-10 16:23 – Updated: 2026-09-10 17:13

Title

Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch

Summary

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPart and NetworkIO::AddTimeStepPart unchecked. In LSTM::Forward in src/lstm/lstm.cpp, source_ is sized from the independently deserialized na_ field while the WriteTimeStepPart count is ns_, which comes from the CI gate WeightMatrix dim1() value. A crafted NT_LSTM layer can make ns_ much larger than na_, causing a heap out-of-bounds write during the first recognition step on the default LSTM engine and resulting in heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.

Severity

8.6 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 17:12 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/tesseract-ocr/tesseract/securi…	x_refsource_CONFIRM
https://github.com/tesseract-ocr/tesseract/commit…	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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FKIE_CVE-2026-88049

Vulnerability from fkie_nvd - Published: 2026-09-10 17:17 - Updated: 2026-09-14 20:01

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/tesseract-ocr/tesseract/commit/b494ac18925f9d9aff9ef5815475de9943ab19bf	Patch
security-advisories@github.com	https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-jgq8-pprg-vc68	Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-jgq8-pprg-vc68	Vendor Advisory

Impacted products

	Vendor	Product	Version
	tesseract-ocr	tesseract_ocr	*

JSON

To clipboard

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          "vendor": "tesseract-ocr",
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  ],
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    }
  ],
  "id": "CVE-2026-88049",
  "lastModified": "2026-09-14T20:01:48.403",
  "metrics": {
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          "attackComplexity": "LOW",
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          "confidentialityImpact": "NONE",
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          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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  ]
}

ubuntu-cve-2026-88049

Vulnerability from osv_ubuntu

Published

2026-09-10 17:17

Modified

2026-09-16 11:43

Summary

Details

Severity

8.6 (High)


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

5.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-88049	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-88049	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. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPart and NetworkIO::AddTimeStepPart unchecked. In LSTM::Forward in src/lstm/lstm.cpp, source_ is sized from the independently deserialized na_ field while the WriteTimeStepPart count is ns_, which comes from the CI gate WeightMatrix dim1() value. A crafted NT_LSTM layer can make ns_ much larger than na_, causing a heap out-of-bounds write during the first recognition step on the default LSTM engine and resulting in heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.",
  "id": "UBUNTU-CVE-2026-88049",
  "modified": "2026-09-16T11:43:12Z",
  "published": "2026-09-10T17:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-88049"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-88049"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-88049"
  ]
}

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-2026-88049 (GCVE-0-2026-88049)

FKIE_CVE-2026-88049

ubuntu-cve-2026-88049

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour