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    CVE-2026-43970

    Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in ninenines cowlib allows unauthenticated remote denial of service via memory exhaustion. cow_spdy:inflate/2 in cowlib passes peer-supplied compressed bytes directly to zlib:inflate/2 with no output size bound. The SPDY header compression dictionary (?ZDICT) is public, and zlib compresses long runs of repeated bytes at roughly 1024:1, so a few kilobytes of SPDY frame payload can decompress to gigabytes on the BEAM heap, OOM-killing the node. A single unauthenticated SPDY frame is sufficient to trigger the condition. The parsers for syn_stream, syn_reply, and headers frame types are all affected via cow_spdy:parse_headers/2. This issue affects cowlib from 0.1.0 before 2.16.1.

    Published:May 13, 2026
    Last Modified:May 14, 2026
    EPS:May 13, 2026
    EPSS Score:0.00139
    CVSS Score:8.2

    Affected Products

    Vendor
    Ninenines
    Product
    Cowlib

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-43971 (CVSS 6.3) — Improper Encoding or Escaping of Output vulnerability in ninenines cowlib allows Link header directive smuggli…
    CVE-2026-59248 (CVSS 8.7) — Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP…
    CVE-2026-43966 (CVSS 6.3) — Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in…
    CVE-2026-43968 (CVSS 6.3) — Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in ninenines cowlib allows SSE even…
    CVE-2026-7790 (CVSS 8.7) — Uncontrolled Resource Consumption vulnerability in ninenines cowlib (cow_http_te module) allows Excessive Allo…
    CVE-2026-43969 (CVSS 2.1) — Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in ninenines cowlib allows HTTP req…

    Common Vulnerability Scoring System

    Attack Vector
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    Local
    Physical
    Privileges Required
    None
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    High
    User Interaction
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    Scope
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    Changed
    Confidentiality
    None
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    Integrity
    None
    Low
    High
    Availability
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    High