CVE-2026-77118
Description
A flaw was found in GraphicsMagick. A heap out-of-bounds write vulnerability exists in the Photo CD (PCD) decoder. A remote attacker could exploit this by providing a specially crafted PCD file. Processing this file can lead to corruption of heap memory, potentially resulting in arbitrary code execution.
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, avoid processing untrusted Photo CD (PCD) files with GraphicsMagick utilities such as `gm convert` or `gm identify`, or with any application linked against `libGraphicsMagick`. Restrict the execution environment or user permissions for these tools if they must handle external input.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce 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.
