Vulnerability-Lookup

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

Notes

Topic: An update for tesseract is now available for Red Hat Enterprise Linux 8. 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 31 products

Product	Version	Remediation
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-0:4.1.1-3.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-0:4.1.1-3.el8_10.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-0:4.1.1-3.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-0:4.1.1-3.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-0:4.1.1-3.el8_10.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-0:4.1.1-3.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.i686	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debuginfo-0:4.1.1-3.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.i686	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-debugsource-0:4.1.1-3.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-devel-0:4.1.1-3.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-devel-0:4.1.1-3.el8_10.i686	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-devel-0:4.1.1-3.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-devel-0:4.1.1-3.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:tesseract-devel-0:4.1.1-3.el8_10.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:67832	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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          "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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          "text": "tesseract: Tesseract: Heap out-of-bounds write via crafted .traineddata",
          "title": "Vulnerability summary"
        },
        {
          "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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      "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 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
tesseract-ocr	tesseract	Affected: < 5.5.3

Show details on NVD website

JSON

To clipboard

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  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-73066",
    "datePublished": "2026-08-11T14:49:16.817Z",
    "dateReserved": "2026-08-10T19:37:41.443Z",
    "dateUpdated": "2026-08-11T15:36:09.326Z",
    "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.