There exists a use after free/double free in libwebp. An attacker can use the ApplyFiltersAndEncode() function and loop through to free best.bw and assign best = trial pointer. The second loop will then return 0 because of an Out of memory error in VP8 encoder, the pointer is still assigned to trial and the AddressSanitizer will attempt a double free.

OSVersionArchitecturePackageVersionFilename
Alpineedge-communitynoarchfirefox-esr< 102.10.0-r0UNKNOWN
Alpineedge-mainnoarchlibwebp< 1.3.0-r3UNKNOWN
Alpine3.15-mainnoarchlibwebp< 1.2.2-r1UNKNOWN
Alpine3.16-mainnoarchlibwebp< 1.2.3-r1UNKNOWN
Alpine3.17-mainnoarchlibwebp< 1.2.4-r2UNKNOWN
Alpine3.18-communitynoarchfirefox-esr< 102.10.0-r0UNKNOWN
Alpine3.18-mainnoarchlibwebp< 1.3.0-r2UNKNOWN
Alpine3.19-communitynoarchfirefox-esr< 102.10.0-r0UNKNOWN
Alpine3.19-mainnoarchlibwebp< 1.3.0-r3UNKNOWN

OS	Version	Architecture	Package	Version	Filename
Alpine	edge-community	noarch	firefox-esr	< 102.10.0-r0	UNKNOWN
Alpine	edge-main	noarch	libwebp	< 1.3.0-r3	UNKNOWN
Alpine	3.15-main	noarch	libwebp	< 1.2.2-r1	UNKNOWN
Alpine	3.16-main	noarch	libwebp	< 1.2.3-r1	UNKNOWN
Alpine	3.17-main	noarch	libwebp	< 1.2.4-r2	UNKNOWN
Alpine	3.18-community	noarch	firefox-esr	< 102.10.0-r0	UNKNOWN
Alpine	3.18-main	noarch	libwebp	< 1.3.0-r2	UNKNOWN
Alpine	3.19-community	noarch	firefox-esr	< 102.10.0-r0	UNKNOWN
Alpine	3.19-main	noarch	libwebp	< 1.3.0-r3	UNKNOWN