ALPINE-CVE-2026-5503
- Source
- https://security.alpinelinux.org/vuln/CVE-2026-5503
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-5503.json
- JSON Data
- https://api.osv.dev/v1/vulns/ALPINE-CVE-2026-5503
- Upstream
- Published
- 2026-04-09T23:17:01Z
- Modified
- 2026-11-03T06:33:06Z
- Severity
-
- 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
Affected packages
Alpine:v3.23 / wolfssl
Package
- Name
- wolfssl
- Purl
- pkg:apk/alpine/wolfssl?arch=source