CVE-2026-73066

Publication date 11 August 2026

Last updated 6 October 2026

Ubuntu priority

Medium

Why this priority?

Description

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.

Status

Package Ubuntu Release Status
tesseract 26.04 LTS resolute
Fixed 5.5.0-1ubuntu0.1~esm1
24.04 LTS noble
Fixed 5.3.4-1ubuntu0.1~esm1
22.04 LTS jammy
Fixed 4.1.1-2.1ubuntu0.1~esm1
20.04 LTS focal
Fixed 4.1.1-2ubuntu0.1~esm1
18.04 LTS bionic
Fixed 4.00~git2288-10f4998a-2ubuntu0.1~esm1
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
tesseract

Severity score breakdown

CVSS version: CVSS v4.0

Base score 6.8 · Medium

Vector: 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

References

Related Ubuntu Security Notices (USN)

    • USN-8882-1
    • Tesseract vulnerabilities
    • 6 October 2026

Other references

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