Bug 2531551 (CVE-2026-88050)

Summary:	CVE-2026-88050 tesseract: Tesseract: Out-of-bounds write leads to Denial of Service
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Tesseract. It was discovered that the `RecodedCharID::DeSerialize` function accepts negative code values from a specially crafted `.traineddata` recoder component. This can lead to an out-of-bounds write when `SetupDecoder` attempts to index a zero-sized vector with a negative code. A local attacker providing a malicious `.traineddata` file could exploit this to reliably cause a wild-address crash or an allocation failure, resulting in a denial of service (DoS).	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2531776
Bug Blocks:

Description OSIDB Bzimport 2026-09-10 16:41:32 UTC

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.