CVE-2026-75615 ASN1SCC: Out-of-bounds read via unvalidated character index in ASN.1 string decoders
MediumCVSS 5.3
EPSS 0.24%
- Published
- Updated
- Exploit status
- No public exploit known
Description
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| esa asn1scc | = < 4.7.0.1 | No fix listed |