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    2 vulnerabilities found for zlib by ruby-lang

    CVE-2026-27820 (GCVE-0-2026-27820)

    Vulnerability from nvd – Published: 2026-04-16 17:27 – Updated: 2026-04-16 18:20
    VLAI
    Title
    zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption
    Summary
    zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstream_buffer_ungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.
    Severity
    1.7 (Low)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
    • CWE-131 - Incorrect Calculation of Buffer Size
    Assigner
    References
    Impacted products
    Vendor Product Version
    ruby zlib Affected: < 3.0.1
    Affected: >= 3.1.0, < 3.1.2
    Affected: >= 3.2.0, < 3.2.3
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-27820 (GCVE-0-2026-27820)

    Vulnerability from cvelistv5 – Published: 2026-04-16 17:27 – Updated: 2026-04-16 18:20
    VLAI
    Title
    zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption
    Summary
    zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstream_buffer_ungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.
    Severity
    1.7 (Low)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
    • CWE-131 - Incorrect Calculation of Buffer Size
    Assigner
    References
    Impacted products
    Vendor Product Version
    ruby zlib Affected: < 3.0.1
    Affected: >= 3.1.0, < 3.1.2
    Affected: >= 3.2.0, < 3.2.3
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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