Hi,

The following vulnerability was published for libsixel.

CVE-2025-61146[0]:
| saitoha libsixel until v1.8.7 was discovered to contain a memory
| leak via the component malloc_stub.c.

https://github.com/saitoha/libsixel/issues/207
https://github.com/saitoha/libsixel/commit/e0ba6685262a3679cc5b9009c0c5b7dc8a3f262e


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2025-61146
https://www.cve.org/CVERecord?id=CVE-2025-61146

Please adjust the affected versions in the BTS as needed.