CVE-2026-62381 luci-lib-px5g 2040-bit Certificate Signing Heap Buffer Overflow

luci-lib-px5g LuCI contains a heap-based buffer overflow in the native ASN.1 encoding routine asn1addobj x509write.c when signing a certificate with a 2040-bit RSA key. For a 255-byte signature, the BIT STRING allocation is computed from the DER length encoding of 255 bytes, but the payload writt...

CVE-2026-62381

luci-lib-px5g (LuCI) in OpenWrt contains a heap-based buffer overflow in the ASN.1 encoding routine asn1_add_obj (x509write.c) triggered when signing a certificate with a 2040-bit RSA key . The BIT STRING allocation is sized for a 255-byte signature's DER length encoding, but prepending the unuse...