2531579 – (CVE-2026-88052) CVE-2026-88052 tesseract: Tesseract: Heap out-of-bounds write can lead to arbitrary code execution

Bug 2531579 (CVE-2026-88052) - CVE-2026-88052 tesseract: Tesseract: Heap out-of-bounds write can lead to arbitrary code execution

Summary: CVE-2026-88052 tesseract: Tesseract: Heap out-of-bounds write can lead to arb...

Keywords:
Status:	NEW
Alias:	CVE-2026-88052
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	high
Severity:	high
Target Milestone:	---
Assignee:	Product Security
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:	2531778
Blocks:
TreeView+	depends on / blocked

Reported:	2026-09-10 17:52 UTC by OSIDB Bzimport
Modified:	2026-11-09 11:53 UTC (History)
CC List:	2 users (show)
Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2026:95085	None	None	None	2026-11-04 11:44:21 UTC
Red Hat Product Errata	RHSA-2026:95086	None	None	None	2026-11-04 13:04:21 UTC
Red Hat Product Errata	RHSA-2026:95725	None	None	None	2026-11-05 23:24:36 UTC
Red Hat Product Errata	RHSA-2026:96238	None	None	None	2026-11-09 11:53:07 UTC
Red Hat Product Errata	RHSA-2026:96239	None	None	None	2026-11-09 11:41:20 UTC

Description OSIDB Bzimport 2026-09-10 17:52:34 UTC

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.

Comment 2 Jon Orris 2026-11-04 11:44:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:95085 https://access.redhat.com/errata/RHSA-2026:95085

Comment 3 Jon Orris 2026-11-04 13:04:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:95086 https://access.redhat.com/errata/RHSA-2026:95086

Comment 4 Jon Orris 2026-11-05 23:24:35 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:95725 https://access.redhat.com/errata/RHSA-2026:95725

Comment 5 errata-xmlrpc 2026-11-09 11:41:19 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:96239 https://access.redhat.com/errata/RHSA-2026:96239

Comment 6 errata-xmlrpc 2026-11-09 11:53:05 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:96238 https://access.redhat.com/errata/RHSA-2026:96238

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