CVE-2026-45615
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In asn1c version 1.4 and earlier, a memory safety vulnerability was found in the generated OER decoding code for INTEGER type. When parsing a maliciously crafted zero-length OER payload for a variable-length non-negative INTEGER, the decoder fails to validate required bytes before extracting the Most Significant Bit, causing a precise 1-byte Heap Out-of-Bounds Read.
Risk Assessment
The risk is that a remote attacker can send specially crafted network data (e.g., in V2X protocols, 5G headers, or X.509 certificates) to a system using asn1c-generated code, causing Denial of Service (DoS) or incorrect integer interpretation, potentially leading to protocol state poisoning or logic bypass.
Recommendation
Immediately update asn1c to a version newer than 1.4 if available, or apply a security patch. In the meantime, restrict trust in network-originated input and implement additional validation at the application level.
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Original NVD description (English source)
mouse07410/asn1c is an ASN.1 compiler. In 1.4 and earlier, a memory safety vulnerability was identified in the OER decoding skeleton files generated by asn1c (specifically INTEGER_oer.c). When parsing a maliciously crafted, zero-length OER payload for a variable-length, non-negative INTEGER type, the decoder fails to validate the required bytes before extracting the Most Significant Bit (MSB). This forces a precise 1-byte Heap Out-of-Bounds (OOB) Read. Because asn1c generated code is primarily deployed to parse untrusted network inputs (such as V2X network protocols, 5G telecom headers, or X.509 certificates), when the decoder processes untrusted network-originated input, a remote attacker can exploit this to cause a Denial of Service (DoS) or trigger incorrect integer interpretation in downstream applications (e.g., protocol state poisoning or logic bypass).