CVE-2026-75615
ASN1SCC: Out-of-bounds read via unvalidated character index in ASN.1 string decoders
Published 2 d ago · modified 2 d ago · JSON
Summary
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.
Exploit prediction (EPSS)
0.24% probability of exploitation in the next 30 days, higher than 15% of all scored CVEs.
CVSS scores
| Assigned by | Version | Score | Vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected products
- esa asn1scc
Classification
References
- github.com /esa/asn1scc/security/advisories/GHSA-234q-m7gr-pcf8 · x_refsource_CONFIRM
- github.com /esa/asn1scc/commit/fe6ab763bc60d8a2def4104c15414809b45fffd9 · x_refsource_MISC
- github.com /esa/asn1scc/releases/tag/4.7.0.1 · x_refsource_MISC
Sources
- CVE List: CVE-2026-75615
- NVD: CVE-2026-75615
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