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CVE-2026-45615— mouse07410/asn1c: 1-byte Heap Out-of-Bounds Read in `INTEGER_decode_oer` via Malformed OER Payload

Quick assessment

Affected
mouse07410 asn1c
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

asn1c是Lev Walkin个人开发者的一个 ASN.1 编译器。 asn1c 1.4及之前版本存在安全漏洞，该漏洞源于OER解码骨架文件中的内存安全问题，当解析特制的零长度有效载荷时，解码器在提取最高有效位前未验证所需字节，导致堆越界读取，可能造成拒绝服务或下游应用程序整数解释错误。

CVSS 8.2 · High EPSS 0.20% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
mouse07410 asn1c <= 1.4 affected
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I. Basic Information for CVE-2026-45615

Vulnerability Information
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Vulnerability Title
mouse07410/asn1c: 1-byte Heap Out-of-Bounds Read in `INTEGER_decode_oer` via Malformed OER Payload
Source: CVE Program / CVE List V5
Vulnerability Description
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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
asn1c 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
asn1c是Lev Walkin个人开发者的一个 ASN.1 编译器。 asn1c 1.4及之前版本存在安全漏洞，该漏洞源于OER解码骨架文件中的内存安全问题，当解析特制的零长度有效载荷时，解码器在提取最高有效位前未验证所需字节，导致堆越界读取，可能造成拒绝服务或下游应用程序整数解释错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mouse07410 asn1c <= 1.4 -

II. Public POCs for CVE-2026-45615

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III. Intelligence Information for CVE-2026-45615

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Vendor Advisories for CVE-2026-45615 (1)

IV. Related Vulnerabilities

Same product: asn1c
Same vendor: mouse07410
Same weakness: CWE-20