Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadNormProtos in src/classify/normmatch.cpp parses the NORMPROTO component of a .traineddata file and uses std::istream::operator>>(char*) to extract a whitespace-delimited token into a fixed 61-byte stack buffer without setting a stream width. The 100-byte line buffer can carry a token of up to 99 characters, so a token longer than 60 characters writes up to 39 attacker-controlled bytes past the buffer during TessBaseAPI::Init of the legacy engine, causing stack corruption, denial of service, and potentially control-flow hijacking on affected standard-library implementations. Builds using Apple's libc++ C++20 bounded array overload are incidentally protected, while typical libstdc++ builds remain affected. No fixed release is available as of this review.

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, Classify::ReadNormProtos in     src/classify/normmatch.cpp parses the NORMPROTO component of a .traineddata file and uses     std::istream::operator>>(char*) to extract a whitespace-delimited token into a fixed 61-byte stack buffer     without setting a stream width. The 100-byte line buffer can carry a token of up to 99 characters, so a     token longer than 60 characters writes up to 39 attacker-controlled bytes past the buffer during     TessBaseAPI::Init of the legacy engine, causing stack corruption, denial of service, and potentially     control-flow hijacking on affected standard-library implementations. Builds using Apple's libc++ C++20     bounded array overload are incidentally protected, while typical libstdc++ builds remain affected. No     fixed release is available as of this review. (CVE-2026-88047)

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

ID	Name	Product	Family	Type	Severity
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
344648	Linux Distros Unpatched Vulnerability : CVE-2026-88047	Nessus	Misc.	Local	high

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CVE-2026-88047

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