CVE-2026-61626 libass: Out-of-bounds bit clears for negative Matroska ReadOrder values

libass is a portable subtitle renderer for the ASS/SSA Advanced Substation Alpha/Substation Alpha subtitle format. From 0.17.4 until 0.17.5, libass event pruning does not guard negative Matroska ReadOrder values, allowing an attacker to clear arbitrarily many bits to zero at attacker-controlled...

CVE-2026-61626: libass: libass is a portable subtitle renderer for the ASS/SSA (Advanced Substation Alpha/Substation Alpha) subtitle format

libass is a portable subtitle renderer for the ASS/SSA Advanced Substation Alpha/Substation Alpha subtitle format. From 0.17.4 until 0.17.5, libass event pruning does not guard negative Matroska ReadOrder values, allowing an attacker to clear arbitrarily many bits to zero at attacker-controlled...