osamu620 OpenHTJ2K up to 0.18.4 Decoder decoder.cpp invoke buffer overflow

Summaryinfo

A vulnerability identified as problematic has been detected in osamu620 OpenHTJ2K up to 0.18.4. This affects the function invoke of the file source/core/interface/decoder.cpp of the component Decoder. Performing a manipulation results in buffer overflow. This vulnerability is identified as CVE-2026-51808. The attack is only possible with local access. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in osamu620 OpenHTJ2K up to 0.18.4. This affects the function invoke of the file source/core/interface/decoder.cpp of the component Decoder. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Buffer Overflow vulnerability in OpenHTJ2K v.0.18.4 and before allows an attacker to execute arbitrary code via the openhtj2k_decoder_impl::invoke, invoke_line_based, invoke_line_based_stream, and invoke_line_based_predecoded function in source/core/interface/decoder.cpp

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-51808 since 06/08/2026. The exploitability is told to be easy. An attack has to be approached locally. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/15/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• osamu620

Name

• OpenHTJ2K

Version

• 0.18.0
• 0.18.1
• 0.18.2
• 0.18.3
• 0.18.4

Website

• Product: https://github.com/osamu620/OpenHTJ2K/

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