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CVE-2026-55991: Ngtcp2 Invalid Application Error Codecve-2026-55991-ngtcp2-invalid-application-error-code

Passing `-1` as an application error code to `ngtcp2_ccerr_set_application_error` or `ngtcp2_connection_close_error_set_application_error` causes an implicit cast to `UINT64_MAX`. This exceeds the maximum value for a QUIC variable-length integer (62 bits) and will cause an assertion failure in libngtcp2 during serialization. Pass a valid application error co

CCVE-2026-55991CWE-681
by Provallyupdated 2026-09-02Apache-2.0
2780 direct278 via packs
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