Description
In TLSX_EchChangeSNI, the ctx->extensions branch set extensions unconditionally even when TLSX_Find returned NULL. This caused TLSX_UseSNI to attach the attacker-controlled publicName to the shared WOLFSSL_CTX when no inner SNI was configured. TLSX_EchRestoreSNI then failed to clean it up because its removal was gated on serverNameX != NULL. The inner ClientHello was sized before the pollution but written after it, causing TLSX_SNI_Write to memcpy 255 bytes past the allocation boundary.
INFO
Published Date :
2026-04-09T22:35:39.437Z
Last Modified :
2026-04-10T17:58:51.312Z
Source :
wolfSSL
AFFECTED PRODUCTS
The following products are affected by CVE-2026-5503 vulnerability.
| Vendors | Products |
|---|---|
| Wolfssl |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-5503.
| URL | Resource |
|---|---|
| https://github.com/wolfSSL/wolfssl/pull/10102 |
|
CVSS Vulnerability Scoring System
Detailed values of each vector for above chart.
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