CVE-2026-76875
Description
A flaw was found in PyPy's pyexpat module. A remote attacker can cause memory corruption by supplying a specially crafted Extensible Markup Language (XML) document to an application that processes external entity sub-parsers without keeping a reference to the parent parser. This situation triggers a use-after-free condition, where the parent parser's memory is released prematurely while still referenced by the sub-parser, resulting in invalid memory access during parsing.
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.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the expired pointer is used in a read operation, an attacker might be able to control data read in by the application.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the expired pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the expired pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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