CVE-2026-75615

ASN1SCC is an open source ASN.1 compiler for embedded systems. Prior to 4.7.0.1, the ACN runtime function Acn_Dec_String_CharIndex_private in asn1crt/asn1crt_encoding_acn.c and the generated uPER decoder InternalItem_string_with_alpha_decode in StgC/uper_c.stg do not validate a decoded character index before reading allowedCharSet. For string alphabets whose size is not a power of two, a crafted message can select an unused encoded index, read a small bounded window of adjacent static program constants, and return the byte as a successfully decoded character. The full 128-character IA5String alphabet is not affected. This issue is fixed in version 4.7.0.1.

• CWE-125
• CWE-129

• https://github.com/esa/asn1scc/commit/fe6ab763bc60d8a2def4104c15414809b45fffd9
• https://github.com/esa/asn1scc/releases/tag/4.7.0.1
• https://github.com/esa/asn1scc/security/advisories/GHSA-234q-m7gr-pcf8

Published

Nov 5, 2026

Last Modified

Nov 5, 2026

Status

Received

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