CVE catalog

CVE-2026-73066

Tesseract is an open source OCR engine. Prior to…

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: High · CVSS 8.6CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Aug 11, 2026, 2:49:16 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.13% · Oct 27, 2026

Projects and upstream resources

[tesseract][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "tesseract",
      "status": "vulnerable",
      "release": "sid",
      "version": "5.5.0-1.1"
    },
    {
      "name": "tesseract",
      "status": "vulnerable",
      "release": "forky",
      "version": "5.5.0-1.1"
    },
    {
      "name": "tesseract",
      "status": "vulnerable",
      "release": "trixie",
      "version": "5.5.0-1"
    },
    {
      "name": "tesseract",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "5.3.0-2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1144388,
      "name": "tesseract",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1144388,
      "name": "tesseract",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1144388,
      "name": "tesseract",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1144388,
      "name": "tesseract",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "tesseract",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "5.3.4-1ubuntu0.1~esm1",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "5.3.4-1ubuntu0.1~esm1"
    },
    {
      "name": "libtesseract-dev",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "5.3.4-1ubuntu0.1~esm1",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "5.3.4-1ubuntu0.1~esm1"
    },
    {
      "name": "libtesseract5",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "5.3.4-1ubuntu0.1~esm1",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "5.3.4-1ubuntu0.1~esm1"
    },
    {
      "name": "tesseract-ocr",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "5.3.4-1ubuntu0.1~esm1",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "5.3.4-1ubuntu0.1~esm1"
    },
    {
      "name": "tesseract-ocr-all",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "5.3.4-1ubuntu0.1~esm1",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "5.3.4-1ubuntu0.1~esm1"
    },
    {
      "name": "tesseract",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.5.0-1ubuntu0.1~esm1"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "5.5.0-1",
        "5.5.0-1build1"
      ],
      "ecosystem": "deb",
      "fixed_version": "5.5.0-1ubuntu0.1~esm1",
      "provider_record_id": "USN-8882-1"
    }
  ]
}

[Debian bug #1144388]

Publisher notes

[trixie] tesseract: Minor issue [bookworm] tesseract: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libtesseract5]Unknown
Source package: [tesseract]
Details (2)
- 5.3.0-2 · amd64 · bookworm
  Affected
  nvd · tesseract · debian · bookworm; nvd · tesseract · debian · 12
- 5.3.0-2 · arm64 · bookworm
  Affected
  nvd · tesseract · debian · bookworm; nvd · tesseract · debian · 12
[libtesseract-dev]Unknown
Source package: [tesseract]
Details (2)
- 5.3.0-2 · amd64 · bookworm
  Affected
  nvd · tesseract · debian · bookworm; nvd · tesseract · debian · 12
- 5.3.0-2 · arm64 · bookworm
  Affected
  nvd · tesseract · debian · bookworm; nvd · tesseract · debian · 12
[tesseract-ocr]Unknown
Source package: [tesseract]
Details (2)
- 5.3.0-2 · amd64 · bookworm
  Affected
  nvd · tesseract · debian · bookworm; nvd · tesseract · debian · 12
- 5.3.0-2 · arm64 · bookworm
  Affected
  nvd · tesseract · debian · bookworm; nvd · tesseract · debian · 12
[tesseract-ocr-all]Unknown
Source package: [tesseract]
Details (2)
- 5.3.0-2 · all · bookworm
  Affected
  nvd · tesseract · debian · bookworm; nvd · tesseract · debian · 12
- 5.3.0-2 · all · bookworm
  Affected
  nvd · tesseract · debian · bookworm; nvd · tesseract · debian · 12

[Debian 13 (Trixie)]

[libtesseract5]Unknown
Source package: [tesseract]
Details (2)
- 5.5.0-1+b1 · amd64 · trixie
  Affected
  nvd · tesseract · debian · 13
- 5.5.0-1+b1 · arm64 · trixie
  Affected
  nvd · tesseract · debian · 13
[libtesseract-dev]Unknown
Source package: [tesseract]
Details (2)
- 5.5.0-1+b1 · amd64 · trixie
  Affected
  nvd · tesseract · debian · 13
- 5.5.0-1+b1 · arm64 · trixie
  Affected
  nvd · tesseract · debian · 13
[tesseract-ocr]Unknown
Source package: [tesseract]
Details (2)
- 5.5.0-1+b1 · amd64 · trixie
  Affected
  nvd · tesseract · debian · 13
- 5.5.0-1+b1 · arm64 · trixie
  Affected
  nvd · tesseract · debian · 13
[tesseract-ocr-all]Unknown
Source package: [tesseract]
Details (2)
- 5.5.0-1 · all · trixie
  Affected
  nvd · tesseract · debian · 13
- 5.5.0-1 · all · trixie
  Affected
  nvd · tesseract · debian · 13

Observed: Oct 23, 2026, 9:42:14 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]