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    2 vulnerabilities found for snac2 by grunfink

    CVE-2026-112021 (GCVE-0-2026-112021)

    Vulnerability from nvd – Published: 2026-10-18 11:38 – Updated: 2026-10-19 16:05
    VLAI
    Title
    snac2 before 2.93 Heap-Based Buffer Overflow via JSON Parser _xs_json_load_lexer()
    Summary
    snac2 before 2.93 contains a heap-based buffer overflow vulnerability in _xs_json_load_lexer() that allows unauthenticated remote attackers to corrupt heap memory by sending JSON strings containing a \u0000 escape. Attackers can send a single crafted application/activity+json POST to activitypub_post_handler(), which parses it before signature checks, overflowing heap allocations and crashing the server.
    Severity
    8.7 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-19 16:04 UTC
    CWE
    • CWE-122 - Heap-based Buffer Overflow
    Assigner
    VulnCheck CNA under the mitre root
    CNA scorecard B 84/100 over 6503 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    grunfink snac2 Affected: 0 , < 2.93 (custom)
    		Create a notification for this product.
    Date Public
    2026-07-08 00:00
    Credits
    nullenvk
    Show details on NVD website
    To clipboard 

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    CVE-2026-112021 (GCVE-0-2026-112021)

    Vulnerability from cvelistv5 – Published: 2026-10-18 11:38 – Updated: 2026-10-19 16:05
    VLAI
    Title
    snac2 before 2.93 Heap-Based Buffer Overflow via JSON Parser _xs_json_load_lexer()
    Summary
    snac2 before 2.93 contains a heap-based buffer overflow vulnerability in _xs_json_load_lexer() that allows unauthenticated remote attackers to corrupt heap memory by sending JSON strings containing a \u0000 escape. Attackers can send a single crafted application/activity+json POST to activitypub_post_handler(), which parses it before signature checks, overflowing heap allocations and crashing the server.
    Severity
    8.7 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-19 16:04 UTC
    CWE
    • CWE-122 - Heap-based Buffer Overflow
    Assigner
    VulnCheck CNA under the mitre root
    CNA scorecard B 84/100 over 6503 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    grunfink snac2 Affected: 0 , < 2.93 (custom)
    		Create a notification for this product.
    Date Public
    2026-07-08 00:00
    Credits
    nullenvk
    Show details on NVD website
    To clipboard 

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