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Fencer Intel
medium 6.8

CVE-2026-73066 json

Tesseract: Heap out-of-bounds write in LSTM Convolve layer via crafted .traineddata

published 3mo ago modified 18d ago also EUVD-2026-56181

cvss
6.8
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

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.

Patch / fix

  • tesseract_ocr_project tesseract_ocr 5.5.3
  • tesseract_project tesseract 5.5.3
  • tesseract Ubuntu Pro 18.04 LTS 4.00~git2288-10f4998a-2ubuntu0.1~esm1
  • tesseract Ubuntu Pro 20.04 LTS 4.1.1-2ubuntu0.1~esm1
  • tesseract Ubuntu Pro 22.04 LTS 4.1.1-2.1ubuntu0.1~esm1
  • tesseract Ubuntu Pro 24.04 LTS 5.3.4-1ubuntu0.1~esm1
  • tesseract Ubuntu Pro 26.04 LTS 5.5.0-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2026-73066

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tesseract RHEL 9 4.1.1-8.el9_8
  • tesseract RHEL 8 4.1.1-3.el8_10
  • tesseract RHEL 10.2 5.3.4-7.el10_2
  • tesseract RHEL 9.2 E4S 4.1.1-7.el9_2.1
  • tesseract RHEL 9.6 EUS 4.1.1-7.el9_6.1
  • tesseract RHEL 9.4 E4S 4.1.1-7.el9_4.1
  • tesseract enterprise linux eus 10.0 5.3.4-6.el10_0.1
  • tesseract RHEL 8.6 EUS_LONG_LIFE, RHEL 8.6 AUS 4.1.1-2.el8_6.1

red hat advisories RHSA-2026:72280RHSA-2026:71567RHSA-2026:71568RHSA-2026:71566RHSA-2026:69495RHSA-2026:69111

  • tesseract AlmaLinux 9 4.1.1-8.el9_8
  • tesseract AlmaLinux 8 4.1.1-3.el8_10

almalinux advisories ALSA-2026:67831ALSA-2026:67832

  • tesseract Rocky Linux 10 5.3.4-7.el10_2
  • tesseract Rocky Linux 8 4.1.1-3.el8_10
  • tesseract Rocky Linux 9 4.1.1-8.el9_8

rocky linux advisories RLSA-2026:67830RLSA-2026:67832RLSA-2026:67831

Is CVE-2026-73066 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-73066 updated cvss 7.1

tesseract: Tesseract: Heap out-of-bounds write via crafted .traineddata

  • Red Hat AI Inference Server 3.2 rhaiis/vllm-cuda-rhel9 1790621718, rhaiis/vllm-rocm-rhel9 1790621713, rhaiis/model-opt-cuda-rhel9 1790621714
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:73859
  • Red Hat AI Inference Server 3.5 rhaii/vllm-cpu-rhel9 1791473614, rhaii/vllm-cuda-rhel9 1791473631, rhaii/vllm-rocm-rhel9 1791425869, rhaii/vllm-gaudi-rhel9 1791427182, rhaii/vllm-spyre-rhel9 1791818357, rhaii/model-opt-cuda-rhel9 1791803821
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:82066
  • Red Hat CodeReady Linux Builder EUS (v.9.6) tesseract-devel 4.1.1-7.el9_6.1, tesseract-debuginfo 4.1.1-7.el9_6.1, tesseract-debugsource 4.1.1-7.el9_6.1, tesseract-tools-debuginfo 4.1.1-7.el9_6.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:71567
  • Red Hat Enterprise Linux AI 3.5 rhelai3/bootc-cuda-rhel9 1793135861, rhelai3/bootc-rocm-rhel9 1793135863, rhelai3/bootc-aws-cuda-rhel9 1793194817, rhelai3/bootc-gcp-cuda-rhel9 1793194815, rhelai3/disk-image-cuda-rhel9 1793206758, rhelai3/bootc-azure-cuda-rhel9 1793194815, +1 more
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:92452
  • Red Hat Enterprise Linux AppStream (v. 8) tesseract 4.1.1-3.el8_10
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:67832
  • Red Hat Enterprise Linux AppStream (v. 9) tesseract 4.1.1-8.el9_8
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:67831
  • Red Hat Enterprise Linux AppStream (v. 10) tesseract 5.3.4-7.el10_2
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:67830
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) tesseract 4.1.1-2.el8_6.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:69495
show 16 more
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) tesseract 4.1.1-2.el8_8.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:69111
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) tesseract 4.1.1-7.el9_2.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:72280
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) tesseract 4.1.1-7.el9_4.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:71568
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) tesseract 5.3.4-6.el10_0.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:71566
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) tesseract 4.1.1-7.el9_6.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:71567
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) tesseract 4.1.1-2.el8_6.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:69495
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) tesseract 4.1.1-2.el8_8.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:69111
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) tesseract-devel 4.1.1-8.el9_8, tesseract-debuginfo 4.1.1-8.el9_8, tesseract-debugsource 4.1.1-8.el9_8, tesseract-tools-debuginfo 4.1.1-8.el9_8
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:67831
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) tesseract-devel 5.3.4-7.el10_2, tesseract-debuginfo 5.3.4-7.el10_2, tesseract-debugsource 5.3.4-7.el10_2, tesseract-tools-debuginfo 5.3.4-7.el10_2
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:67830
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) tesseract-devel 5.3.4-6.el10_0.1, tesseract-debuginfo 5.3.4-6.el10_0.1, tesseract-debugsource 5.3.4-6.el10_0.1, tesseract-tools-debuginfo 5.3.4-6.el10_0.1
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:71566
  • Red Hat Enterprise Linux CRB (v. 8) tesseract-devel 4.1.1-3.el8_10, tesseract-debuginfo 4.1.1-3.el8_10, tesseract-debugsource 4.1.1-3.el8_10
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:67832
  • Red Hat OpenShift AI 3.0 rhai/base-image-cpu-rhel9 1790277045, rhai/base-image-tpu-rhel9 1790276884, rhai/base-image-cuda-rhel9 1790276974, rhai/base-image-rocm-rhel9 1790276886, rhai/base-image-spyre-rhel9 1790276889
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:73960
  • Red Hat OpenShift AI 3.2 rhai/base-image-cpu-rhel9 1790703590, rhai/base-image-tpu-rhel9 1790703497, rhai/base-image-cuda-rhel9 1790703586, rhai/base-image-rocm-rhel9 1790703494, rhai/base-image-rocm-rhel9 1790703506, rhai/base-image-spyre-rhel9 1790703568
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:74460
  • Red Hat OpenShift AI 3.3 rhai/base-image-cpu-rhel9 1790703615, rhai/base-image-tpu-rhel9 1790703516, rhai/base-image-spyre-rhel9 1790703579, rhai/base-image-neuron-rhel9 1790703516, rhai/base-image-rocm-6.4-rhel9 1790703524, rhai/base-image-rocm-7.0-rhel9 1790703516, +4 more
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:74359
  • Red Hat OpenShift AI 3.4 rhai/base-image-cpu-rhel9 1790703631, rhai/base-image-tpu-rhel9 1790703539, rhai/base-image-gaudi-rhel9 1790703553, rhai/base-image-spyre-rhel9 1790703597, rhai/base-image-neuron-rhel9 1790703542, rhai/base-image-rocm-6.4-rhel9 1790703545, +3 more
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:74679
  • Red Hat OpenShift AI 3.5 rhai/base-image-cpu-rhel9 1790703656, rhai/base-image-tpu-rhel9 1790703554, rhai/base-image-gaudi-rhel9 1790703552, rhai/base-image-rubin-rhel9 1790703707, rhai/base-image-spyre-rhel9 1790703630, rhai/base-image-neuron-rhel9 1790703557, +3 more
    fixed: vendor fix “To mitigate this issue, avoid processing `.traineddata` files from untrusted sources with Tesseract. Ensure that only `.traineddata` files from known, reputable origins are used for OCR recognition.” RHSA-2026:75652

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 6.8 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
CNA 4.0 6.8 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

Affected products

  • tesseract-ocr tesseract

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.