UBUNTU-CVE-2026-73066

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Source
https://ubuntu.com/security/CVE-2026-73066
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73066.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-73066
Upstream
Downstream
Related
Published
2026-08-11T15:17:00Z
Modified
2026-10-06T23:34:49Z
Severity
  • 6.8 (Medium) CVSS_V4 - 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 CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:Pro:18.04:LTS / tesseract

Package

Name
tesseract
Purl
pkg:deb/ubuntu/tesseract?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.00~git2288-10f4998a-2ubuntu0.1~esm1

Affected versions

3.*
3.04.01-6
3.04.01-6build1
3.04.01-6build2
4.*
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 

{
    "availability":  "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libtesseract4",
            "binary_version":  "4.00~git2288-10f4998a-2ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr",
            "binary_version":  "4.00~git2288-10f4998a-2ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr-all",
            "binary_version":  "4.00~git2288-10f4998a-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73066.json"

Ubuntu:Pro:20.04:LTS / tesseract

Package

Name
tesseract
Purl
pkg:deb/ubuntu/tesseract?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.1.1-2ubuntu0.1~esm1

Affected versions

4.*
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 

{
    "availability":  "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libtesseract4",
            "binary_version":  "4.1.1-2ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr",
            "binary_version":  "4.1.1-2ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr-all",
            "binary_version":  "4.1.1-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73066.json"

Ubuntu:Pro:22.04:LTS / tesseract

Package

Name
tesseract
Purl
pkg:deb/ubuntu/tesseract?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.1.1-2.1ubuntu0.1~esm1

Affected versions

4.*
4.1.1-2.1
4.1.1-2.1build1

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libtesseract4",
            "binary_version":  "4.1.1-2.1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr",
            "binary_version":  "4.1.1-2.1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr-all",
            "binary_version":  "4.1.1-2.1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73066.json"

Ubuntu:Pro:24.04:LTS / tesseract

Package

Name
tesseract
Purl
pkg:deb/ubuntu/tesseract?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.3.4-1ubuntu0.1~esm1

Affected versions

5.*
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 

{
    "availability":  "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libtesseract5",
            "binary_version":  "5.3.4-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr",
            "binary_version":  "5.3.4-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr-all",
            "binary_version":  "5.3.4-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73066.json"

Ubuntu:Pro:26.04:LTS / tesseract

Package

Name
tesseract
Purl
pkg:deb/ubuntu/tesseract?arch=source&distro=esm-apps%2Fresolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.5.0-1ubuntu0.1~esm1

Affected versions

5.*
5.5.0-1
5.5.0-1build1

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libtesseract5",
            "binary_version":  "5.5.0-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr",
            "binary_version":  "5.5.0-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "tesseract-ocr-all",
            "binary_version":  "5.5.0-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73066.json"