Vulnerability · Published Sep 10, 2026 · Assigned by GitHub_M
CVE-2026-88054Tesseract: Denial of service via empty-stack dereference in Plumbing/Series at model load
Medium 6.9
In plain English
A medium-severity out-of-bounds read in tesseract from tesseract-ocr. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | tesseract | no fix listed | DEBIAN-CVE-2026-88054 |
| Debian:13 | tesseract | no fix listed | DEBIAN-CVE-2026-88054 |
| Debian:14 | tesseract | no fix listed | DEBIAN-CVE-2026-88054 |
| Ubuntu:26.10 | tesseract | no fix listed | UBUNTU-CVE-2026-88054 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| tesseract-ocr | tesseract | <= 5.5.3 |
Weakness: CWE-125, CWE-824 · Vector: 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