Listen to this Post
A heap buffer overflow vulnerability exists in ImageMagick’s WriteXWDImage function, specifically due to a 32-bit unsigned integer overflow in the calculation of `bytes_per_line` for XWD (X Windows) images. The vulnerability arises when the software processes an extremely large image. The `bytes_per_line` value, which is a `CARD32` (32-bit unsigned integer), can be manipulated to overflow during arithmetic operations. This overflow causes the subsequent heap buffer allocation to be undersized. When the image data is subsequently written to this undersized buffer, it results in an out-of-bounds heap write, potentially leading to a denial of service or arbitrary code execution. The issue is present in versions prior to 7.1.2-16 and 6.9.13-41 .
dailycve form:
Platform: ImageMagick
Version: 6.9.13-40
Vulnerability :Heap Buffer Overflow
Severity: 6.8 MEDIUM
date: 2026-03-10
Prediction: April 2026
What Undercode Say:
Analytics
This vulnerability (CVE-2026-30937) is a heap-based buffer overflow caused by an integer overflow (CWE-190) leading to insufficient heap allocation (CWE-122). It has a CVSS v3.1 base score of 6.8 (Medium). The attack vector is local, with low attack complexity, and requires no privileges or user interaction, though it only affects confidentiality and integrity in a limited manner while having a high impact on availability .
Exploit:
A successful exploit would involve crafting a malicious XWD image file with dimensions large enough to cause the `bytes_per_line height` calculation to wrap around a 32-bit integer. This forces a smaller-than-required heap buffer allocation. When the image data is written, it overflows the heap buffer.
Example of triggering the vulnerable code path (conceptual) ./imagemagick convert exploit.xwd output.png
Protection from this CVE
Update ImageMagick to version 7.1.2-16, 6.9.13-41, or later. If an immediate update is not possible, as a workaround, avoid processing untrusted XWD image files.
Check your current version identify -version Update on Debian/Ubuntu sudo apt update && sudo apt install imagemagick Update on RHEL/CentOS/Fedora sudo dnf update ImageMagick
Impact
If exploited, this vulnerability can lead to a denial of service due to application crash or memory corruption. In more severe scenarios, it could potentially allow for the execution of arbitrary code with the privileges of the user running the ImageMagick process .
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
