High [CVE-2026-88053] Heap out-of-bounds write leads to heap corruption via crafted data file
This high-severity Red Hat Linux advisory covers CVE-2026-88053 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in Tesseract, an open-source Optical Character Recognition (OCR) engine. A local attacker could provide a specially crafted `.traineddata` file, which, when processed, could lead to a heap out-of-bounds write.
This vulnerability occurs due to unvalidated counts used as loop bounds during legacy-classifier initialization. Successful exploitation could result in heap corruption, causing a crash or potentially controlled corruption of memory.
Red Hat severity: Important — CVSS 8.4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-787.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: tesseract.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, ensure that Tesseract only processes .traineddata files from trusted sources. Avoid loading or processing .traineddata files from untrusted or unverified origins, as these could be specially crafted to trigger the heap corruption. If Tesseract must process untrusted input, consider running the application in a sandboxed environment to limit the potential impact of successful exploitation.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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