Vulnerability-Lookup

RHSA-2026:67830

Vulnerability from csaf_redhat - Published: 2026-09-16 07:19 - Updated: 2026-10-31 08:46

Summary

Red Hat Security Advisory: tesseract security update

Severity

Important

Notes

Topic: An update for tesseract is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

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

CWE-787 - Out-of-bounds Write

Affected products

Fixed 33 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:tesseract-0:5.3.4-7.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-0:5.3.4-7.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-0:5.3.4-7.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-0:5.3.4-7.el10_2.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-0:5.3.4-7.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-debuginfo-0:5.3.4-7.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-debuginfo-0:5.3.4-7.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-debuginfo-0:5.3.4-7.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-debuginfo-0:5.3.4-7.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-debugsource-0:5.3.4-7.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-debugsource-0:5.3.4-7.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-debugsource-0:5.3.4-7.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-debugsource-0:5.3.4-7.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-tools-debuginfo-0:5.3.4-7.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-tools-debuginfo-0:5.3.4-7.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-tools-debuginfo-0:5.3.4-7.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:tesseract-tools-debuginfo-0:5.3.4-7.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-debuginfo-0:5.3.4-7.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-debuginfo-0:5.3.4-7.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-debuginfo-0:5.3.4-7.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-debuginfo-0:5.3.4-7.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-debugsource-0:5.3.4-7.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-debugsource-0:5.3.4-7.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-debugsource-0:5.3.4-7.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-debugsource-0:5.3.4-7.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-devel-0:5.3.4-7.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-devel-0:5.3.4-7.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-devel-0:5.3.4-7.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-devel-0:5.3.4-7.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-tools-debuginfo-0:5.3.4-7.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-tools-debuginfo-0:5.3.4-7.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-tools-debuginfo-0:5.3.4-7.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:tesseract-tools-debuginfo-0:5.3.4-7.el10_2.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:67830	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2514011	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-73066	self
https://bugzilla.redhat.com/show_bug.cgi?id=2514011	external
https://www.cve.org/CVERecord?id=CVE-2026-73066	external
https://nvd.nist.gov/vuln/detail/CVE-2026-73066	external
https://github.com/tesseract-ocr/tesseract/commit…	external
https://github.com/tesseract-ocr/tesseract/pull/4588	external
https://github.com/tesseract-ocr/tesseract/releas…	external
https://github.com/tesseract-ocr/tesseract/securi…	external

JSON

To clipboard

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        "name": "Out-of-bounds Write"
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          "category": "description",
          "text": "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\u0027s 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.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "tesseract: Tesseract: Heap out-of-bounds write via crafted .traineddata",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat has rated this vulnerability as having an impact of Important because an out-of-bounds heap write during model processing can lead to arbitrary code execution or application crashes. Under default deployments across Red Hat platforms, Tesseract relies on verified, system-provided language packs, limiting exposure in standard use. The risk primarily manifests in automated document processing workflows or services that allow external users to submit untrusted trained model files.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-73066"
        },
        {
          "category": "external",
          "summary": "RHBZ#2514011",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514011"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-73066",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-73066"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-73066",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73066"
        },
        {
          "category": "external",
          "summary": "https://github.com/tesseract-ocr/tesseract/commit/2f4d2f4bf45c363785d7bf1da29b6628f8939a72",
          "url": "https://github.com/tesseract-ocr/tesseract/commit/2f4d2f4bf45c363785d7bf1da29b6628f8939a72"
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        {
          "category": "external",
          "summary": "https://github.com/tesseract-ocr/tesseract/pull/4588",
          "url": "https://github.com/tesseract-ocr/tesseract/pull/4588"
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        {
          "category": "external",
          "summary": "https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.3",
          "url": "https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.3"
        },
        {
          "category": "external",
          "summary": "https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7j76-5rq5-5jg8",
          "url": "https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7j76-5rq5-5jg8"
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      "release_date": "2026-08-11T14:49:16.817000+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-09-16T07:19:48+00:00",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:67830"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.",
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      "scores": [
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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
            "version": "3.1"
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "tesseract: Tesseract: Heap out-of-bounds write via crafted .traineddata"
    }
  ]
}

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 CNA under the mitre root

CNA scorecard C 72/100 over 7820 records in the last 180 days details

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
tesseract-ocr	tesseract	Affected: < 5.5.3

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-73066",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-11T15:31:52.040987Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-11T15:36:09.326Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "tesseract",
          "vendor": "tesseract-ocr",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.5.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787: Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7j76-5rq5-5jg8",
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          "url": "https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7j76-5rq5-5jg8"
        },
        {
          "name": "https://github.com/tesseract-ocr/tesseract/pull/4588",
          "tags": [
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        },
        {
          "name": "https://github.com/tesseract-ocr/tesseract/commit/2f4d2f4bf45c363785d7bf1da29b6628f8939a72",
          "tags": [
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        },
        {
          "name": "https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.3",
          "tags": [
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          "url": "https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.3"
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      "source": {
        "advisory": "GHSA-7j76-5rq5-5jg8",
        "discovery": "UNKNOWN"
      },
      "title": "Tesseract: Heap out-of-bounds write in LSTM Convolve layer via crafted .traineddata"
    }
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  "cveMetadata": {
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    "dateReserved": "2026-08-10T19:37:41.443Z",
    "dateUpdated": "2026-08-11T15:36:09.326Z",
    "state": "PUBLISHED"
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  "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.

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