An issue has been found in third-party PNM decoding associated with libpng 1.6.35. It is a stack-based buffer overflow in the function get_token in pnm2png.c in pnm2png.
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.oracle.com/security-alerts/cpuApr2021.html
https://security.netapp.com/advisory/ntap-20221028-0001/
https://security.gentoo.org/glsa/201908-02