{"id":"CVE-2026-75615","published":"2026-11-05T17:18:20.663","lastModified":"2026-11-05T17:18:20.663","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.","cvssScore":5.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwes":["CWE-125","CWE-129"],"vendors":[],"products":[],"references":[{"url":"https://github.com/esa/asn1scc/commit/fe6ab763bc60d8a2def4104c15414809b45fffd9","tags":[]},{"url":"https://github.com/esa/asn1scc/releases/tag/4.7.0.1","tags":[]},{"url":"https://github.com/esa/asn1scc/security/advisories/GHSA-234q-m7gr-pcf8","tags":[]}],"exploitRefs":[{"url":"https://github.com/esa/asn1scc/commit/fe6ab763bc60d8a2def4104c15414809b45fffd9","tags":[]},{"url":"https://github.com/esa/asn1scc/releases/tag/4.7.0.1","tags":[]},{"url":"https://github.com/esa/asn1scc/security/advisories/GHSA-234q-m7gr-pcf8","tags":[]}],"hasPoc":true,"ai":null}