Buffer overflow in Esa Asn1scc
CVE-2026-75614
ASN1SCC is an open source ASN.1 compiler for embedded systems. Prior to 4.7.0.1, BitStream_DecodeConstraintWholeNumber in asn1crt/asn1crt_encoding.c reads enough bits for a constrained integer but does not reject values above the declared range when the encoded range is not a power of two. Generated uPER and ACN decoders for variable-size SEQUENCE OF, OCTET STRING, BIT STRING, and string values use the invalid result as a loop or copy length, so a crafted over-range size field can write beyond a destination buffer. Decoding untrusted affected data can corrupt heap or stack memory, cause a crash, or potentially permit code execution. This issue is fixed in version 4.7.0.1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Esa Asn1scc — versions < 4.7.0.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-75614?
- CVE-2026-75614 is a high-severity vulnerability in Esa Asn1scc, classified under Improper Validation of Array Index. CVSS score: 8.1/10. Published 2026-11-05.
- How severe is CVE-2026-75614?
- High severity. CVSS v3 base score is 8.1 out of 10.