CVE-2026-30883: ImageMagick Buffer Overflow Vulnerability

CVE-2026-30883 Overview

CVE-2026-30883 is a heap overflow vulnerability discovered in ImageMagick, the widely-used free and open-source software for editing and manipulating digital images. Prior to versions 7.1.2-16 and 6.9.13-41, processing an extremely large image profile could trigger a heap overflow condition when encoding a PNG image. This memory corruption vulnerability could lead to application crashes and potential denial of service, with limited integrity impact.

Critical Impact

A heap overflow during PNG encoding may allow attackers to crash ImageMagick processes or potentially corrupt memory, affecting systems that process untrusted image files.

Affected Products

• ImageMagick versions prior to 7.1.2-16
• ImageMagick versions prior to 6.9.13-41
• Systems and applications using vulnerable ImageMagick libraries for image processing

Discovery Timeline

• 2026-03-10 - CVE CVE-2026-30883 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2026-30883

Vulnerability Analysis

This vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), which describes conditions where software performs operations on a memory buffer without properly restricting the size or boundaries of those operations. In this case, ImageMagick fails to properly validate the size of image profile data before allocating and writing to heap memory during PNG encoding operations.

When a maliciously crafted image with an extremely large profile is processed, the encoding routines may write beyond the allocated buffer boundaries on the heap. This can corrupt adjacent memory structures, leading to unpredictable application behavior, crashes, or in certain scenarios, potential code execution if an attacker can carefully control the overflow contents.

The vulnerability requires local access to trigger, meaning an attacker would need to either have the victim process a malicious image file or have local system access to invoke ImageMagick directly.

Root Cause

The root cause stems from insufficient bounds checking when handling oversized image profile data during PNG encoding operations. ImageMagick's PNG encoding routines allocate heap memory based on expected profile sizes but fail to properly validate or cap the actual profile size, leading to a heap buffer overflow when processing profiles that exceed allocated buffer boundaries.

Attack Vector

This vulnerability has a local attack vector, requiring an attacker to either:

1. Trick a user or automated system into processing a specially crafted image file with an oversized profile
2. Have local access to a system running ImageMagick and directly invoke image processing commands

The attack complexity is high due to the specific conditions required to trigger the overflow. The vulnerability does not require authentication or privileges but also does not require user interaction once the malicious image is submitted for processing. Exploitation primarily results in availability impact (denial of service through crashes) with limited integrity impact from potential memory corruption.

The vulnerability mechanism involves the PNG encoding pathway processing image profiles beyond safe memory boundaries. For technical implementation details, refer to the GitHub Security Advisory.

Detection Methods for CVE-2026-30883

Indicators of Compromise

• Unexpected ImageMagick process crashes or segmentation faults during PNG encoding operations
• Abnormal memory consumption spikes when processing image files
• Core dumps or crash logs indicating heap corruption in ImageMagick processes
• Presence of unusually large image files with oversized embedded profiles

Detection Strategies

• Monitor ImageMagick processes for abnormal terminations or crash events
• Implement file integrity monitoring on systems processing untrusted images
• Deploy runtime application self-protection (RASP) to detect heap corruption attempts
• Review system logs for repeated ImageMagick failures when processing specific files

Monitoring Recommendations

• Enable verbose logging for ImageMagick operations to capture processing errors
• Set up alerts for repeated crashes of image processing services
• Monitor memory usage patterns for ImageMagick processes handling external images
• Implement input validation to reject images with abnormally large profiles before processing

How to Mitigate CVE-2026-30883

Immediate Actions Required

• Upgrade ImageMagick to version 7.1.2-16 or later for the 7.x branch
• Upgrade ImageMagick to version 6.9.13-41 or later for the 6.x branch
• Audit systems and applications that integrate ImageMagick for image processing
• Implement input validation to limit image profile sizes before processing

Patch Information

ImageMagick has released security patches addressing this vulnerability. The fix is included in versions 7.1.2-16 and 6.9.13-41. Organizations should update their ImageMagick installations immediately. For detailed patch information and release notes, consult the GitHub Security Advisory.

Workarounds

• Implement resource limits using ImageMagick's policy.xml configuration file
• Restrict the maximum profile size allowed during image processing
• Disable PNG encoding functionality if not required for operations
• Process untrusted images in sandboxed or containerized environments

# ImageMagick policy.xml configuration to limit resources
# Location: /etc/ImageMagick-7/policy.xml or /etc/ImageMagick-6/policy.xml

# Add resource limits to mitigate oversized profile attacks
<policy domain="resource" name="memory" value="256MiB"/>
<policy domain="resource" name="map" value="512MiB"/>
<policy domain="resource" name="disk" value="1GiB"/>

# Restrict delegate operations for untrusted input
<policy domain="delegate" rights="none" pattern="*"/>