Tesseract is an open source OCR engine. In version 5.5.3 and earlier, UNICHARSET::load_via_fgets in src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked index into the unichars vector. unichar_insert_backwards_compatible can leave the vector unchanged for an empty, duplicate, or already-encodable representation, causing id to become larger than unichars.size(). Subsequent set_* calls and the write to unichars[id].properties.enabled then write UNICHAR_PROPERTIES beyond the vector during initialization in both the default LSTM and legacy engines, causing heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-fc27f09459 advisory.

    Backport fixes for CVE-2026-{88047-88054}

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-4585aba520 advisory.

    Backport fixes for CVE-2026-{88047-88054}

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8882-1 advisory.

    It was discovered that Tesseract incorrectly handled crafted .traineddata models. An attacker could     possibly use this issue to cause Tesseract to crash, resulting in a denial of service. (CVE-2026-73067)

    It was discovered that Tesseract did not properly validate dimensions in crafted .traineddata models. An     attacker could possibly use this issue to execute arbitrary code. (CVE-2026-73066)

    It was discovered that Tesseract did not properly limit token lengths in crafted .traineddata models. An     attacker could possibly use this issue to execute arbitrary code. (CVE-2026-88047)

    It was discovered that Tesseract did not properly validate layer dimensions in crafted .traineddata     models. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-88048)

    It was discovered that Tesseract did not properly validate layer sizes in crafted .traineddata models. An     attacker could possibly use this issue to execute arbitrary code. (CVE-2026-88049)

    It was discovered that Tesseract incorrectly handled negative character codes in crafted .traineddata     models. An attacker could possibly use this issue to cause Tesseract to crash, resulting in a denial of     service. (CVE-2026-88050)

    It was discovered that Tesseract did not properly validate vector sizes in crafted .traineddata models. An     attacker could possibly use this issue to execute arbitrary code. (CVE-2026-88051)

    It was discovered that Tesseract did not properly validate character IDs in crafted .traineddata models.
    An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-88052)

    It was discovered that Tesseract did not properly validate classifier counts in crafted .traineddata     models. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-88053)

    It was discovered that Tesseract incorrectly handled empty network layers in crafted .traineddata models.
    An attacker could possibly use this issue to cause Tesseract to crash, resulting in a denial of service.
    (CVE-2026-88054)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Tesseract is an open source OCR engine. In version 5.5.3 and earlier, UNICHARSET::load_via_fgets in
    src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked
    index into the unichars vector. unichar_insert_backwards_compatible can leave the vector unchanged for an
    empty, duplicate, or already-encodable representation, causing id to become larger than unichars.size().
    Subsequent set_* calls and the write to unichars[id].properties.enabled then write UNICHAR_PROPERTIES
    beyond the vector during initialization in both the default LSTM and legacy engines, causing heap
    corruption, a crash, or potentially controlled corruption. No fixed release is available as of this
    review. (CVE-2026-88052)

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21957-1 advisory.

    Changes in tesseract-ocr:

    - Update to version 5.5.3 (sync with Factory):
      * CVE-2026-73067: heap out-of-bounds read in SquishedDawg on crafted model (boo#1275623)
      * CVE-2026-88047: stack buffer overflow in Classify::ReadNormProtos on crafted traineddata (boo#1280925)
      * CVE-2026-88048: heap out-of-bounds write/read in FullyConnected::Forward via dimension mismatch     (boo#1280929)
      * CVE-2026-88049: heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch     (boo#1280930)
      * CVE-2026-88050: out-of-bounds write in UnicharCompress via unvalidated recoder code values     (boo#1280931)
      * CVE-2026-88051: heap out-of-bounds write in GenericVector<T>::read via reserved/size_used_ mismatch         (boo#1280932)
      * CVE-2026-88052: heap out-of-bounds write in UNICHARSET::load_via_fgets via count/insert         desynchronization (boo#1280933)
      * CVE-2026-88053: heap out-of-bounds write in Classify::ReadIntTemplates via unvalidated counts in         crafted traineddata (boo#1280934)
      * CVE-2026-88054: denial of service via empty-stack dereference at model load (boo#1280935)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-e3bf7f4ecb advisory.

    Backport fixes for CVE-2026-{88047-88054}

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Tesseract is an open source OCR engine. In version 5.5.3 and earlier, UNICHARSET::load_via_fgets in     src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked     index into the unichars vector. unichar_insert_backwards_compatible can leave the vector unchanged for an     empty, duplicate, or already-encodable representation, causing id to become larger than unichars.size().
    Subsequent set_* calls and the write to unichars[id].properties.enabled then write UNICHAR_PROPERTIES     beyond the vector during initialization in both the default LSTM and legacy engines, causing heap     corruption, a crash, or potentially controlled corruption. No fixed release is available as of this     review. (CVE-2026-88052)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
363791	Fedora 44 : tesseract (2026-fc27f09459)	Nessus	Fedora Local Security Checks	Local	high
363786	Fedora 43 : tesseract (2026-4585aba520)	Nessus	Fedora Local Security Checks	Local	high
363742	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : Tesseract vulnerabilities (USN-8882-1)	Nessus	Ubuntu Local Security Checks	Local	high
473177	Echo: tesseract: security update to 5.5.0-1+e3	Tenable Cloud Security	Echo Local Security Checks	Local	high
473177	Echo: tesseract: security update to 5.5.0-1+e3	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
350763	openSUSE 16: libtesseract5 / libtesseract5-x86-64-v3 / tesseract-ocr / etc (openSUSE-SU-2026:21957-1)	Nessus	SuSE Local Security Checks	Local	high
350705	Fedora 45 : tesseract (2026-e3bf7f4ecb)	Nessus	Fedora Local Security Checks	Local	high
344687	Linux Distros Unpatched Vulnerability : CVE-2026-88052	Nessus	Misc.	Local	high

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CVE-2026-88052

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