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.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-84270bbc49 advisory.

    Cowlib 2.16.1



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-ce0a56ca97 advisory.

    Cowlib 2.16.1



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-43970)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
315965	Fedora 44 : erlang-cowlib (2026-84270bbc49)	Nessus	Fedora Local Security Checks	high
315963	Fedora 43 : erlang-cowlib (2026-ce0a56ca97)	Nessus	Fedora Local Security Checks	high
314739	Linux Distros Unpatched Vulnerability : CVE-2026-43970	Nessus	Misc.	high

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CVE-2026-43970

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