CVE-2021-36081 Use after free in n/a
A use-after-free vulnerability in Tesseract OCR allows attackers to potentially execute arbitrary code or cause a denial of service via crafted input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-36081?
CVE-2021-36081 is a high-severity use after free vulnerability in n/a, published on 1 Jul 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Tesseract OCR 5.0.0-alpha-20201231 has a one_ell_conflict use-after-free during a strpbrk call.
Weakness: CWE-416
Which versions are affected by CVE-2021-36081?
It affects 1 product.
Products include Tesseract-Ocr Tesseract Ocr.
How do I fix CVE-2021-36081?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-36081 being exploited?
There is no known exploitation of CVE-2021-36081 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2026-88047 Tesseract: ReadNormProtos stack buffer overflow
- CVE-2026-88048 Tesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matrix dimension mismatch
- CVE-2026-88049 Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch
- CVE-2026-88051 Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields
- CVE-2026-88053 Tesseract: Heap out-of-bounds write in Classify::ReadIntTemplates via unvalidated counts in crafted .traineddata
Sources
Also known as DEBIAN-CVE-2021-36081, GHSA-5x29-fwcc-jm29, UBUNTU-CVE-2021-36081.