Out-of-bounds Write

Overview Affected versions of this package are vulnerable to Out-of-bounds Write through improper handling of the publicName parameter in the TLSXEchChangeSNI process. An attacker can cause memory corruption or potentially execute arbitrary code by supplying a specially crafted value that leads t...

UBUNTU-CVE-2026-5503

In TLSXEchChangeSNI, the ctx-extensions branch set extensions unconditionally even when TLSXFind returned NULL. This caused TLSXUseSNI to attach the attacker-controlled publicName to the shared WOLFSSLCTX when no inner SNI was configured. TLSXEchRestoreSNI then failed to clean it up because its...

CVE-2026-5503 out-of-bounds write in TLSX_EchChangeSNI via attacker-controlled publicName

In TLSXEchChangeSNI, the ctx-extensions branch set extensions unconditionally even when TLSXFind returned NULL. This caused TLSXUseSNI to attach the attacker-controlled publicName to the shared WOLFSSLCTX when no inner SNI was configured. TLSXEchRestoreSNI then failed to clean it up because its...

CVE-2026-5503

CVE-2026-5503 affects wolfSSL’s TLSX_EchChangeSNI: the code path sets ctx->extensions unconditionally even when TLSX_Find returns NULL, causing an attacker-controlled publicName to be bound to the shared WOLFSSL_CTX when no inner SNI is configured. TLSX_EchRestoreSNI cannot clean it up because...