CVE-2025-6199

A flaw was found in the GIF parser of GdkPixbuf’s LZW decoder. When an invalid symbol is encountered during decompression, the decoder sets the reported output size to the full buffer length rather than the actual number of written bytes. This logic error results in uninitialized sections of the buffer being included in the output, potentially leaking arbitrary memory contents in the processed image.

The Red Hat Product Security team has assessed the severity of this vulnerability as Low, as it requires user interaction and local access to exploit. The flaw allows limited information disclosure by including uninitialized memory in image buffers processed by GdkPixbuf. This occurs due to improper output length handling when decoding malformed GIFs using LZW compression. While exploitable with crafted inputs, the impact is minor and does not affect system integrity or availability.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.