ImageMagick has memory leak of watermark Image object in ReadSTEGANOImage on multiple error/early-return paths
### Summary In `ReadSTEGANOImage()` (`coders/stegano.c`), the `watermark` Image object is not freed on three early-return paths, resulting in a definite memory leak (~13.5KB+ per invocation) that can be exploited for denial of service. ``` Direct leak of 13512 byte(s) in 1 object(s) allocated from: #0 0x7f5c11e27887 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145 #1 0x55cdc38f65c4 in AcquireMagickMemory MagickCore/memory.c:536 #2 0x55cdc38f65eb in AcquireCriticalMemory MagickCore/memory.c:612 #3 0x55cdc3899e91 in AcquireImage MagickCore/image.c:154 ```
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-25796US | high7.5 | — | ||
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-15 and 6.9.13-40, in `ReadSTEGANOImage()` (`coders/stegano.c`… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/ImageMagick/ImageMagickPACKAGE
- https://github.com/ImageMagick/ImageMagick/commit/93ad259ce4f6d641eea0bee73f374af90f35efc3WEB
- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-g2pr-qxjg-7r2wWEB
- https://github.com/dlemstra/Magick.NET/releases/tag/14.10.3WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-25796ADVISORY
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