UBUNTU-CVE-2026-88050

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-88050
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88050.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-88050
Upstream
Downstream
Related
Published
2026-09-10T17:17:00Z
Modified
2026-10-17T12:56:17Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, RecodedCharID::DeSerialize in src/ccutil/unicharcompress.h validates length_ but accepts negative code_ values from a crafted .traineddata recoder component. UnicharCompress::ComputeCodeRange in src/ccutil/unicharcompress.cpp can consequently produce code_range_ equal to zero, after which SetupDecoder indexes is_valid_start_ with the negative code on a size-zero vector. The resulting out-of-bounds bit write uses a large wrapped index and reliably causes a wild-address crash or allocation failure on the default LSTM engine. No fixed release is available as of this review.

References

Affected packages

Ubuntu:26.10
tesseract

Package

Name
tesseract
Purl
pkg:deb/ubuntu/tesseract?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.5.0-1build1
5.5.0-1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libtesseract5",
            "binary_version": "5.5.0-1.1"
        },
        {
            "binary_name": "tesseract-ocr",
            "binary_version": "5.5.0-1.1"
        },
        {
            "binary_name": "tesseract-ocr-all",
            "binary_version": "5.5.0-1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88050.json"
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-2026-88050.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-2026-88050.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-2026-88050.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-2026-88050.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-2026-88050.json"