CVE-2026-30141
Description
CVE-2026-30141: A heap-based buffer overflow in AnimatedGIF's DecodeLZW function allows remote attackers to crash the application or execute arbitrary code via a crafted GIF.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
CVE-2026-30141: A heap-based buffer overflow in AnimatedGIF's DecodeLZW function allows remote attackers to crash the application or execute arbitrary code via a crafted GIF.
Vulnerability
A heap-based buffer overflow vulnerability exists in the DecodeLZW() function within the bitbank2 AnimatedGIF library, specifically around line 425 in src/AnimatedGIF.h. This issue arises from insufficient bounds checking when processing LZW decompression, particularly when LZW codes exceed the expected maximum or when the pDraw->iTBD index is not properly validated against allocated buffer boundaries. This affects versions of the library up to and including the latest from the master branch as of the reference's publication.
Exploitation
An attacker can exploit this vulnerability by providing a specially crafted GIF file to an application that uses the vulnerable AnimatedGIF library. The crafted GIF triggers the buffer overflow during the LZW decompression process. No specific authentication, privileges, or user interaction are required, making it accessible to remote attackers.
Impact
Successful exploitation of this vulnerability can lead to memory corruption, potentially allowing an attacker to execute arbitrary code with the privileges of the affected application. At a minimum, processing a malformed GIF file will cause the application to crash, resulting in a denial of service.
Mitigation
This vulnerability has been fixed in the AnimatedGIF library. The reference indicates the issue is resolved, and users should update to the latest version from the master branch. No specific fixed version number or release date is provided, but the issue is marked as resolved in the provided reference [1].
AI Insight generated on Jun 9, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
1- Range: =2.2.0
Patches
0No patches discovered yet.
Vulnerability mechanics
Root cause
"The DecodeLZW function in the AnimatedGIF library lacks sufficient bounds checking when processing LZW codes, leading to heap-based buffer overflows."
Attack vector
Remote attackers can trigger this vulnerability by providing a specially crafted GIF file to an application using the AnimatedGIF library. The vulnerability is triggered during the LZW decompression process when the library attempts to decompress the malicious GIF data. This can lead to application crashes or potentially arbitrary code execution.
Affected code
The vulnerability resides in the DecodeLZW() function, located in src/AnimatedGIF.h. Specifically, the issue occurs around line 425 where array indexing is performed without adequate validation against allocated buffer boundaries.
What the fix does
The advisory recommends implementing proper bounds checking in the LZW decompression function and validating GIF file dimensions and compressed data sizes before processing. It also suggests adding input sanitization to prevent buffer overflows. No specific patch details are provided, but these measures aim to prevent out-of-bounds writes.
Preconditions
- inputA specially crafted GIF file.
Reproduction
# Proof of Concept
Compile the provided proof-of-concept code with AddressSanitizer enabled: ```bash g++ -fsanitize=address -g -o poc poc.cpp src/AnimatedGIF.cpp ```
Execute with a specially crafted GIF file: ```bash ./poc ```
Observe AddressSanitizer crash output showing heap-based buffer overflow.
Generated on Jun 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
1News mentions
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