在 libexif 0.6.25 版之前，Nikon MakerNote 处理中的无符号 32 位整数溢出可能被本地攻击者利用，导致崩溃或信息泄露。这仅影响 32 位系统。

CVE-2026-40385 影响 libexif 0.6.26 之前的版本。此漏洞是图像文件中 Nikon 'MakerNote' 数据的处理过程中发生的 32 位无符号整数溢出。此问题仅影响 32 位系统，本地攻击者可能利用此漏洞导致应用程序崩溃或潜在信息泄露。处理恶意图像文件可能导致恶意代码执行或系统内部数据泄露。该漏洞的严重程度在于其可能导致拒绝服务或损害信息机密性的潜力，尤其是在处理大量 Nikon 图像的环境中。

Applications and systems that rely on libexif to process EXIF data, particularly those running on 32-bit architectures, are at risk. This includes image viewers, photo management software, and any other applications that handle image files containing EXIF metadata. Shared hosting environments where multiple users share the same libexif installation are also at increased risk, as a malicious user could potentially exploit the vulnerability to impact other users.

• c / generic: Examine application logs for crashes or unexpected behavior when processing EXIF data, particularly related to Nikon MakerNotes. Use memory debugging tools (e.g., Valgrind) to identify potential integer overflows during EXIF processing. • c / supply-chain: If libexif is a dependency in a larger project, review the project's build system to ensure that the latest version (0.6.26 or later) is being used. Check for any custom patches or modifications to libexif that might reintroduce the vulnerability. • c / server: Monitor system resource usage (CPU, memory) for unusual spikes that could indicate a DoS attack exploiting the overflow.

1. 2026-04-12Disclosure

   disclosure

1. 已保留2026-04-12
2. 发布日期2026-04-12
3. 修改日期2026-04-14
4. EPSS 更新日期2026-04-20

针对 CVE-2026-40385 的建议缓解措施是将 libexif 升级到 0.6.26 或更高版本。此更新修复了整数溢出并防止了潜在的利用。特别是在处理 Nikon 图像文件的 32 位系统上，及时应用此更新至关重要。此外，建议对使用 libexif 的应用程序进行安全审查，以识别潜在的攻击向量。在处理之前验证和清理图像文件也可以作为预防措施。定期监控与图像处理相关的系统日志中是否存在异常行为是一种积极的安全实践。