gdk‑pixbuf JPEG Decoding/Base64 Decoding io‑jpeg.c gdk_pixbuf__jpeg_image_load_increment heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in gdk‑pixbuf. This vulnerability affects the function gdk_pixbuf__jpeg_image_load_increment of the file io‑jpeg.c of the component JPEG Decoding/Base64 Decoding. Such manipulation leads to heap-based overflow. This vulnerability is documented as CVE-2025-7345. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in gdk‑pixbuf (affected version not known). It has been rated as critical. Affected by this issue is the function gdk_pixbuf__jpeg_image_load_increment of the file io‑jpeg.c of the component JPEG Decoding/Base64 Decoding. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

A flaw exists in gdk‑pixbuf within the gdk_pixbuf__jpeg_image_load_increment function (io-jpeg.c) and in glib’s g_base64_encode_step (glib/gbase64.c). When processing maliciously crafted JPEG images, a heap buffer overflow can occur during Base64 encoding, allowing out-of-bounds reads from heap memory, potentially causing application crashes or arbitrary code execution.

The advisory is shared for download at bugzilla.redhat.com. This vulnerability is handled as CVE-2025-7345. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/02/2025).

The vulnerability scanner Nessus provides a plugin with the ID 242233 (CBL Mariner 2.0 Security Update: gdk-pixbuf2 (CVE-2025-7345)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (242233), EUVD (EUVD-2025-20502) and CERT Bund (WID-SEC-2025-1718). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Debian Linux
• Red Hat Enterprise Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• IBM App Connect Enterprise
• Dell Avamar
• Dell NetWorker

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• gdk‑pixbuf

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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