TI-2026-60074 Aliases CVE-2026-88054

Tesseract: Denial of service via empty-stack dereference in Plumbing/Series at model load

MEDIUM 64CWE-125Published 2026-09-10 · Updated 2026-09-10

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Deferred Red Hat: fix deferred

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.

Summary

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Plumbing::DeSerialize in src/lstm/plumbing.cpp rejects excessively large network stacks but accepts a zero-length stack for NT_SERIES, NT_PARALLEL, or NT_REVERSED layers in a crafted .traineddata model. During LSTMRecognizer initialization in src/lstm/lstmrecognizer.cpp, CacheXScaleFactor(XScaleFactor()) reaches Series::CacheXScaleFactor in src/lstm/series.cpp, which dereferences stack_[0] on the empty vector and invokes a virtual method through an invalid Network pointer. This causes a deterministic crash and denial of service at model load. No fixed release is available as of this review.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00153 4th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Deferred Red Hat: fix deferred

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
tesseract-ocr	tesseract	up to 5.5.3	—	No fix listed	CNA

tesseract Vendortesseract-ocr Affected up to 5.5.3 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:tesseract-ocr:tesseract_ocr::::::::	up to 5.5.3	Vulnerable	tesseract-ocr

cpe:2.3:a:tesseract-ocr:tesseract_ocr:*:*:*:*:*:*:*:* Versions up to 5.5.3 Vulnerable ·tesseract-ocr

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-88054

References

Exploit 1

https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-f6h7-cqr4-6fx4

Patch 1

https://github.com/tesseract-ocr/tesseract/commit/552771236b0d80cbdb0c7dd856120fa21a4672e5

TI-2026-60073 Tesseract: Heap out-of-bounds write in Classify::ReadIntTemplates via unvalidated counts in crafted .traineddata CVSS 4.0HIGH 8.6
TI-2026-60071 Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields CVSS 4.0HIGH 8.6
TI-2026-60069 Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch CVSS 4.0HIGH 8.6
TI-2026-60068 Tesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matrix dimension mismatch CVSS 4.0HIGH 8.6
TI-2026-60070 Tesseract: Out-of-bounds write in UnicharCompress via unvalidated recoder code values CVSS 4.0MEDIUM 6.9
TI-2026-60067 Tesseract: ReadNormProtos stack buffer overflow CVSS 4.0HIGH 8.6

See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences