EUVD-2026-56181Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/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 file-based trigger requiring user or application interaction to load the crafted model; no privileges required to invoke Tesseract; no confidentiality impact per vendor advisory; high integrity and availability from heap OOB write.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/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
Lifecycle Timeline
3DescriptionCVE.org
Tesseract is an open source OCR engine. Prior to 5.5.3, a crafted .traineddata LSTM model component loaded through Tesseract's deserializer can cause an unchecked signed integer multiplication in Convolve::DeSerialize in src/lstm/convolve.cpp to wrap the convolution output-channel count, undersizing the forward-pass output buffer while writes use the unwrapped element count and causing a heap out-of-bounds write during OCR recognition. This issue is fixed in version 5.5.3.
AnalysisAI
Heap out-of-bounds write in Tesseract OCR engine prior to 5.5.3 is triggered by a crafted LSTM .traineddata model file that causes a signed integer multiplication overflow in Convolve::DeSerialize, undersizing the forward-pass output buffer while write operations use the original unwrapped element count. Any application or user that loads an attacker-controlled model file is exposed to memory corruption that can lead to arbitrary code execution or process crash in the context of the OCR engine. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a crafted .traineddata LSTM model file be loaded by the Tesseract OCR engine on the target system. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.8 accurately reflects a constrained attack surface: the local attack vector (AV:L) and required user interaction (UI:A) mean this is not a remotely self-propagating flaw and cannot be exploited without first bridging a file-delivery gap. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious .traineddata LSTM model file with ni_, half_x_, and half_y_ values chosen to cause the multiplication in DeSerialize to overflow, producing a small no_ and a correspondingly undersized heap buffer. The file is delivered to a target - for example, by substituting a model file in a shared storage path accessible to a document OCR service, or by passing it through an application that accepts user-specified model paths. … |
| Remediation | Upgrade Tesseract to version 5.5.3, the vendor-confirmed fixed release at https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.3, which incorporates the overflow fixes from commit 2f4d2f4bf45c363785d7bf1da29b6628f8939a72 and PR #4588. … Detailed patch versions, workarounds, and compensating controls in full report. |
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An issue in the Leptonica linked library (v1.79.0) allows attackers to cause an arithmetic exception leading to a Denial
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 Memory Corruption
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External POC / Exploit Code
Leaving vuln.today