CVE-2026-76077

    Dashboard / Vulnerabilities / CVE-2026-76077

    CVE-2026-76077

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary: ASN1SCC: Stack buffer overflow and out-of-bounds read in XER tokenizer NT()

    Details: ASN1SCC is an open source ASN.1 compiler for embedded systems. Prior to 4.7.0.1, the XER tokenizer NT() in asn1crt/asn1crt_encoding_xer.c, which is reached by all XER decode paths, copies tag characters into a fixed char Value[100] field without a length bound and reads input and lookahead bytes without checking the buffer count. A crafted XER message with an overlong tag can overwrite the tokenizer's stack frame, while a truncated tag or unterminated processing-instruction or comment sequence can read beyond the input and may cause a CPU spin. The flaws can disclose adjacent memory, corrupt stack data, crash or hang the decoder, and potentially permit code execution. This issue is fixed in version 4.7.0.1.

    References: https://github.com/esa/asn1scc/releases/tag/4.7.0.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76077.json, https://github.com/esa/asn1scc/security/advisories/GHSA-38q3-fg5h-wwf9, https://nvd.nist.gov/vuln/detail/CVE-2026-76077, https://github.com/esa/asn1scc/commit/fe6ab763bc60d8a2def4104c15414809b45fffd9

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -8437befc92eb04f20a47c38f4ac4742c0ff1617c

    Affected versions

    4.6.0.17
    4.6.0.14
    4.6.0.12
    4.6.0.9
    4.6.0.8
    4.6.0.5
    4.6.0.2
    4.6.0.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-76077 | CVE-DB