Tesseract up to 5.5.3 src/lstm/plumbing.cpp Plumbing::DeSerialize null pointer dereference

Summaryinfo

A vulnerability marked as problematic has been reported in Tesseract up to 5.5.3. This issue affects the function Plumbing::DeSerialize of the file src/lstm/plumbing.cpp. This manipulation causes null pointer dereference. This vulnerability is registered as CVE-2026-88054. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in Tesseract up to 5.5.3. Affected by this vulnerability is the function Plumbing::DeSerialize of the file src/lstm/plumbing.cpp. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Plumbing::DeSerialize in src/lstm/plumbing.cpp rejects excessively large network stacks but accepts a zero-length stack for NT_SERIES, NT_PARALLEL, or NT_REVERSED layers in a crafted .traineddata model. During LSTMRecognizer initialization in src/lstm/lstmrecognizer.cpp, CacheXScaleFactor(XScaleFactor()) reaches Series::CacheXScaleFactor in src/lstm/series.cpp, which dereferences stack_[0] on the empty vector and invokes a virtual method through an invalid Network pointer. This causes a deterministic crash and denial of service at model load. No fixed release is available as of this review.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-88054 since 09/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• Tesseract

Version

• 5.5.0
• 5.5.1
• 5.5.2
• 5.5.3

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