CVE-2026-5503

Name
CVE-2026-5503
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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
facts@wolfssl.com https://github.com/wolfSSL/wolfssl/pull/10102

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:* wolfssl >= None <= 5.9.0

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
wolfssl edge-community 5.9.1-r0 Pavlo Dembytskyi <me@devs.boo> fixed
wolfssl edge-community 5.9.0-r0 Pavlo Dembytskyi <me@devs.boo> possibly vulnerable
wolfssl edge-community 5.8.4-r2 Pavlo Dembytskyi <me@devs.boo> possibly vulnerable
wolfssl edge-community 5.8.4-r1 None possibly vulnerable
wolfssl edge-community 5.8.2-r1 None possibly vulnerable
wolfssl edge-community 5.8.2-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.7.6-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.7.4-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.7.2-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.7.0-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.6.6-r0 None possibly vulnerable
wolfssl edge-community 5.6.2-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.5.3-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.5.1-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.5.0-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.4.0-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl 3.23-community 5.9.1-r0 Jakub Jirutka <jakub@jirutka.cz> fixed
wolfssl 3.23-community 5.8.2-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable