CVE-2026-73420 NextAuth.js: Email normalizer validates the address before Unicode normalization, allowing a homoglyph @ bypass

NextAuth.js provides authentication for Next.js. Prior to @auth/core 0.41.3 and next-auth 4.24.15 and 5.0.0-beta.32, the defaultNormalizer used by the email and magic-link sign-in flow validates an address before applying Unicode normalization. An address can contain a Unicode character such as...

CVE-2026-73420

CVE-2026-73420 affects NextAuth.js email/passwordless flows where the default email normalizer validates addresses before Unicode normalization. An address containing a homoglyph (e.g., U+FF20 FULLWIDTH COMMERCIAL AT) can canonicalize to a normal ASCII @ after NFKC/NFKD, causing downstream mail l...

CVE-2026-70470 Flowise: Pyodide validator Unicode homoglyph bypass leads to RCE

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, Flowise validatePythonCodeForDataFrame in packages/components/src/pythonCodeValidator.ts can be bypassed with Unicode homoglyph identifiers, allowing arbitrary Python execution inside Pyodide...

CVE-2026-70470 Flowise: Pyodide validator Unicode homoglyph bypass leads to RCE

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, Flowise validatePythonCodeForDataFrame in packages/components/src/pythonCodeValidator.ts can be bypassed with Unicode homoglyph identifiers, allowing arbitrary Python execution inside Pyodide...

CVE-2026-70470

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, Flowise validatePythonCodeForDataFrame in packages/components/src/pythonCodeValidator.ts can be bypassed with Unicode homoglyph identifiers, allowing arbitrary Python execution inside Pyodide...

GHSA-7RQJ-J65F-68WH Auth.js: Email normalizer validates the address before Unicode normalization, allowing a homoglyph @ bypass

Summary The default email-address normalizer used by the email/magic-link sign-in flow validates the address before applying Unicode normalization. An address can contain a Unicode character that is not an ASCII @ U+0040 but canonicalizes to one under NFKC/NFKD normalization the normalization...