CVE-2026-7233
Description
A flaw was found in Artifex MuPDF, specifically within its CFF Index Handler component. A local user could exploit an out-of-bounds read vulnerability in the fz_subset_cff_for_gids function. This could allow an attacker to read sensitive information from memory, potentially leading to information disclosure.
Statement
This vulnerability is rated as Low impact. The out-of-bounds read in Artifex MuPDF's CFF Index Handler requires local user access to exploit, limiting its potential for widespread impact on Red Hat systems. Successful exploitation could lead to information disclosure from memory.
Mitigation
Users should avoid opening untrusted or malicious PDF documents with applications that utilize the MuPDF library. If the `mupdf` package is not essential for system operation, consider removing it to eliminate the attack surface.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
An attacker could get secret values such as cryptographic keys, PII, memory addresses, or other information that could be used in additional attacks.
Confidentiality
Technical Impact: Bypass Protection Mechanism
Out-of-bounds memory could contain memory addresses or other information that can be used to bypass ASLR and other protection mechanisms in order to improve the reliability of exploiting a separate weakness for code execution.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker could cause a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer. This is especially likely when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string.
Other
Technical Impact: Varies by Context
The read operation could produce other undefined or unexpected results.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
