EUVD-2026-75630Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Local attack via controlled .traineddata file path; no privileges or user interaction required in automated pipeline scenarios; full heap corruption impact including potential code execution.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadIntTemplates in src/classify/intproto.cpp reads NumClassPruners, NumClasses, and NumProtoSets from the TESSDATA_INTTEMP component of a crafted .traineddata file and uses those values as loop bounds without validating them against MAX_NUM_CLASS_PRUNERS, MAX_NUM_CLASSES, and MAX_NUM_PROTO_SETS. The loops store heap pointers into fixed-capacity ClassPruners and ProtoSets arrays in INT_TEMPLATES_STRUCT and INT_CLASS_STRUCT, so an oversized count causes heap out-of-bounds pointer writes during legacy-classifier initialization before OCR begins, resulting in heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.
AnalysisAI
Heap out-of-bounds write in Tesseract OCR 5.5.3 and earlier allows an attacker who supplies a crafted .traineddata language file to corrupt heap memory during legacy OCR classifier initialization, with potential for controlled code execution. The flaw is in ReadIntTemplates in src/classify/intproto.cpp, which reads NumClassPruners, NumClasses, and NumProtoSets from the TESSDATA_INTTEMP file component and uses them directly as loop bounds - storing heap pointers into fixed-capacity struct arrays without validating against compile-time maximums. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker can supply or substitute a .traineddata language model file consumed by the target Tesseract instance - for example, by writing to the tessdata directory, manipulating the TESSDATA_PREFIX environment variable, or controlling any application-level parameter that selects the language data path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.6 with AV:L reflects that an attacker must control a .traineddata file consumed by the target - a prerequisite that substantially limits opportunistic exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patched version is available as of this analysis; the fix exists only as untagged commit 8b0574680f3b22f246ade6a4c8e3029104255c63 at https://github.com/tesseract-ocr/tesseract/commit/8b0574680f3b22f246ade6a4c8e3029104255c63. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running Tesseract OCR 5.5.3 or earlier and determine which ones process language data files from external or untrusted sources. …
Sign in for detailed remediation steps and compensating controls.
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Heap out-of-bounds write in Tesseract OCR 5.5.3 and earlier allows an attacker who controls a crafted `.traineddata` mod
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Heap out-of-bounds write in Tesseract OCR engine prior to 5.5.3 is triggered by a crafted LSTM .traineddata model file t
Heap out-of-bounds read in Tesseract OCR prior to version 5.5.3 allows an attacker who can supply a crafted .traineddata
Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today