CVE-2026-79515
Description
A flaw was found in the stb component. An out-of-bounds read vulnerability in the stbtt_GetGlyphShape function allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted TrueType Font (TTF) file. This can lead to the affected application becoming unresponsive or crashing.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
To mitigate this issue, users should avoid opening or processing untrusted TTF files with applications that utilize the `stb` library. Additionally, sandboxing applications that handle untrusted font files can limit the potential impact of such vulnerabilities.
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.
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