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CVE-2026-75614— ASN1SCC: Out-of-bounds write in BitStream_DecodeConstraintWholeNumber (uPER/ACN)

Quick assessment

Affected
esa asn1scc
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.

ASN1SCC 是一款面向嵌入式系统的开源 ASN.1 编译器。在版本 4.7.0.1 之前，位于 中的 函数会读取足够数量的比特以解析受限整数，但当编码后的取值范围不是 2 的幂时，该函数未能拒绝超出声明范围的值。由此生成的用于可变长度 SEQUENCE OF、OCTET STRING、BIT STRING 及字符串类型的 uPER 和 ACN 解码器，会将该无效结果用作循环或复制操作的长度参数。因此，精心构造的超出范围的大小字段可能导致写入操作超出目标缓冲区边界。解码不受信任的受影响数据可能破坏堆或栈内存，引发

CVSS 8.1 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
esa asn1scc < 4.7.0.1 affected
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I. Basic Information for CVE-2026-75614

Vulnerability Information
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Vulnerability Title
ASN1SCC: Out-of-bounds write in BitStream_DecodeConstraintWholeNumber (uPER/ACN)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
esa asn1scc < 4.7.0.1 -

II. Public POCs for CVE-2026-75614

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III. Intelligence Information for CVE-2026-75614

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Other References for CVE-2026-75614 (3)

Same Patch Batch · esa · 2026-11-05 · 3 CVEs total

CVE-2026-76077 8.1 HIGH ASN1SCC: Stack buffer overflow and out-of-bounds read in XER tokenizer NT()
CVE-2026-75615 5.3 MEDIUM ASN1SCC: Out-of-bounds read via unvalidated character index in ASN.1 string decoders

IV. Related Vulnerabilities

Same product: asn1scc
Same vendor: esa
Same weakness: CWE-129