@joona70 let us know in the PSXHAX Shoutbox that he ran across a potential userland heap overflow 5.1.1 vulnerability in the GIFLIB library for reading and writing GIF images... as Sony's PS4 uses version 4.1.2.
While it's currently unknown if this could be an entry point in PS4 Firmware above 4.07 OFW, besides the PS4 JailBreak Status Chart and PS4 Hacking / Modding FAQ here's what we know from developer @xxmcvapourxx in summary:
Also Seedlord recently pointed out two more Webkit exploits, namely EDB-ID 40183 and EDB-ID: 40184, that may be a possible entrypoint with #1 and #3 HERE also working for him letting Webkit run out of memory.
- PS4 1.76 Browser Exploit > Kspoilt (Dlclose) Kernel > Fail0verflow's 3D Drivers / Patches with PS4 Kexec exploit
- PS4 3.55 Browser Exploit > Fire30 (Henkaku) > Ksploit (In Progress) > Fail0verflow Kexec exploit
Hopefully more information will become available at this year's PS4 Hardware & Reverse-Engineering CCC Talk which takes place on December 27th of this month with some updates HERE.