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.

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, 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. (CVE-2026-88050)

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.

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, 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. (CVE-2026-88050)

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

ID	Name	Product	Family	Type	Severity
474769	Echo: tesseract: security update to 5.5.0-1+e6	Tenable Cloud Security	Echo Local Security Checks	Local	medium
474769	Echo: tesseract: security update to 5.5.0-1+e6	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
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
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
344649	Linux Distros Unpatched Vulnerability : CVE-2026-88050	Nessus	Misc.	Local	medium

Detections

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CVE-2026-88050

medium

Tenable Plugins

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medium

high

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high

medium