CVE-2025-54874: Uclouvain OpenJPEG Buffer Overflow Flaw

CVE-2025-54874 Overview

CVE-2025-54874 is an out-of-bounds heap memory write vulnerability affecting OpenJPEG, the open-source JPEG 2000 codec library. The vulnerability exists in OpenJPEG versions 2.5.1 through 2.5.3, where a call to opj_jp2_read_header may lead to out-of-bounds heap memory write when the data stream p_stream is too short and p_image is not initialized. This type of memory corruption vulnerability can potentially be exploited to achieve arbitrary code execution or cause application crashes.

Critical Impact

Uninitialized memory use combined with out-of-bounds heap write in OpenJPEG's JPEG 2000 header parsing can lead to memory corruption, potentially enabling code execution or denial of service when processing maliciously crafted JP2 files.

Affected Products

• uclouvain openjpeg versions 2.5.1 through 2.5.3

Discovery Timeline

• 2025-08-05 - CVE-2025-54874 published to NVD
• 2025-09-26 - Last updated in NVD database

Technical Details for CVE-2025-54874

Vulnerability Analysis

The vulnerability stems from improper error handling in the opj_jp2_read_header function within the OpenJPEG library. When parsing a JPEG 2000 file header, the function fails to properly validate the return status before proceeding to access the image structure. If the data stream p_stream is truncated or malformed, the parsing operation may fail, leaving p_image in an uninitialized state. Subsequent code then attempts to set image color space properties on this uninitialized memory, resulting in an out-of-bounds heap write condition.

This vulnerability is classified under CWE-457 (Use of Uninitialized Variable), as the core issue involves accessing and writing to memory that has not been properly initialized due to insufficient error checking after the header parsing operation.

Root Cause

The root cause lies in the opj_jp2_read_header function in src/lib/openjp2/jp2.c. The original code checked if p_image and *p_image were valid pointers before setting color space properties, but it failed to verify that the preceding header parsing operation actually succeeded. This means that even when the parsing function returns an error (indicated by ret being false), the code would proceed to access and modify the image structure if the pointer happened to be non-null, leading to undefined behavior and potential heap corruption.

Attack Vector

The attack vector for this vulnerability requires local access, where an attacker must convince a user or application to process a specially crafted JPEG 2000 file. The attack scenario involves:

1. An attacker creates a malicious JP2 file with a truncated or malformed data stream
2. When OpenJPEG attempts to parse the header, the operation fails
3. Due to missing error validation, the code proceeds to write to uninitialized memory
4. This can result in heap corruption, potentially leading to code execution or application crash

The following patch addresses the vulnerability by ensuring the return status is checked before accessing the image structure:

                               p_image,
                               p_manager);
 
-    if (p_image && *p_image) {
+    if (ret && p_image && *p_image) {
         /* Set Image Color Space */
         if (jp2->enumcs == 16) {
             (*p_image)->color_space = OPJ_CLRSPC_SRGB;

Source: GitHub Commit Update

Detection Methods for CVE-2025-54874

Indicators of Compromise

• Unexpected application crashes when processing JPEG 2000 (JP2, J2K) files
• Memory access violations or segmentation faults in applications using OpenJPEG library
• Presence of malformed or truncated JP2 files with abnormally short data streams
• Anomalous heap corruption patterns in application memory during image processing

Detection Strategies

• Monitor for crashes or exceptions in applications that utilize OpenJPEG for JPEG 2000 processing
• Implement file integrity checks to detect truncated or malformed JP2 files before processing
• Use memory sanitizers (AddressSanitizer, Valgrind) during development to detect heap corruption
• Deploy endpoint detection to identify exploitation attempts targeting image processing libraries

Monitoring Recommendations

• Enable crash dump collection for applications processing JPEG 2000 files to analyze potential exploitation attempts
• Monitor system logs for repeated failures in image processing workflows
• Implement anomaly detection for unusual patterns in JP2 file processing operations
• Track OpenJPEG library versions across your environment to identify vulnerable installations

How to Mitigate CVE-2025-54874

Immediate Actions Required

• Update OpenJPEG to a patched version that includes commit f809b80c67717c152a5ad30bf06774f00da4fd2d
• Audit applications in your environment that depend on OpenJPEG versions 2.5.1 through 2.5.3
• Implement input validation on JP2 files before processing to reject malformed or truncated files
• Consider temporarily disabling JPEG 2000 processing in non-critical workflows until patched

Patch Information

The vulnerability has been addressed by the OpenJPEG maintainers. The fix ensures that the return status from header parsing is validated before any subsequent operations on the image structure. The patch is available via GitHub Commit Update. Additional technical discussion can be found in GitHub Pull Request #1573 and the associated GitHub Security Advisory GHSL-2025-057.

Workarounds

• Validate JPEG 2000 file integrity and size before passing to OpenJPEG for processing
• Implement application sandboxing to limit the impact of potential exploitation
• Use file type validation to ensure JP2 files meet minimum size and structure requirements
• Restrict processing of JPEG 2000 files from untrusted sources until the patch is applied

# Check OpenJPEG version in your environment
opj_decompress -h 2>&1 | grep -i version

# Update OpenJPEG via package manager (example for apt)
sudo apt update && sudo apt install --only-upgrade libopenjp2-7