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CVE-2026-88050— Tesseract: Out-of-bounds write in UnicharCompress via unvalidated recoder code values

Quick assessment

Affected
tesseract-ocr tesseract
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tesseract 是一个开源的光学字符识别（OCR）引擎。在 5.5.3 及更早版本中， 中的 函数虽然校验了 ，但会接受由精心构造的 重编码器（recoder）组件传入的负数 值。随后， 中的 函数可能因此产生等于零的 。接着， 会使用负数 在一个大小为 0 的向量上对 进行索引操作。由此导致的越界位写入使用了较大的回绕索引，并在默认 LSTM 引擎上可靠地引发野指针崩溃或内存分配失败。截至本次审查，尚未有修复版本发布。

CVSS 6.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-88050

Vulnerability Information
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Vulnerability Title
Tesseract: Out-of-bounds write in UnicharCompress via unvalidated recoder code values
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tesseract-ocr tesseract <= 5.5.3 -

II. Public POCs for CVE-2026-88050

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III. Intelligence Information for CVE-2026-88050

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Patches & Fixes for CVE-2026-88050 (1)

Vendor Advisories for CVE-2026-88050 (1)

Same Patch Batch · tesseract-ocr · 2026-09-10 · 8 CVEs total

CVE-2026-88049 8.6 HIGH Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatc
CVE-2026-88048 8.6 HIGH Tesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matri
CVE-2026-88047 8.6 HIGH Tesseract: ReadNormProtos stack buffer overflow
CVE-2026-88051 8.6 HIGH Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/
CVE-2026-88053 8.6 HIGH Tesseract: Heap out-of-bounds write in Classify::ReadIntTemplates via unvalidated counts i
CVE-2026-88052 7.8 HIGH Tesseract: Heap out-of-bounds write in UNICHARSET::load_via_fgets via count/insert desynch
CVE-2026-88054 6.9 MEDIUM Tesseract: Denial of service via empty-stack dereference in Plumbing/Series at model load

IV. Related Vulnerabilities

Same product: tesseract
Same vendor: tesseract-ocr
Same weakness: CWE-787

V. Comments for CVE-2026-88050

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