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CVE-2026-43970— Decompression Bomb in cow_spdy:inflate/2 Allows Memory Exhaustion via Crafted SPDY Frame

Quick assessment

Affected
ninenines cowlib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cowlib是Nine Nines开源的一个Web协议消息解析与构建库。 Cowlib 0.1.0版本至2.16.1之前版本存在安全漏洞，该漏洞源于对高度压缩数据处理不当，cow_spdy:inflate/2函数未限制输出大小，可能导致未经身份验证的远程攻击者通过内存耗尽造成拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.51% · P41

Affected Version Matrix 2

VendorProduct Version RangeStatus
ninenines cowlib 0.1.0< 2.16.1 affected
fad5c0049df278cc498b6cdb519b09e845a070a8< 16aad3fb9f81f5cda4d1706ff0c54237c619c282 affected
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I. Basic Information for CVE-2026-43970

Vulnerability Information
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Vulnerability Title
Decompression Bomb in cow_spdy:inflate/2 Allows Memory Exhaustion via Crafted SPDY Frame
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Cowlib 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cowlib是Nine Nines开源的一个Web协议消息解析与构建库。 Cowlib 0.1.0版本至2.16.1之前版本存在安全漏洞，该漏洞源于对高度压缩数据处理不当，cow_spdy:inflate/2函数未限制输出大小，可能导致未经身份验证的远程攻击者通过内存耗尽造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ninenines cowlib 0.1.0 ~ 2.16.1 cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*
ninenines cowlib fad5c0049df278cc498b6cdb519b09e845a070a8 ~ 16aad3fb9f81f5cda4d1706ff0c54237c619c282 cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-43970

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III. Intelligence Information for CVE-2026-43970

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Vendor Advisories for CVE-2026-43970 (2)

IV. Related Vulnerabilities

Same product: cowlib
Same vendor: ninenines
Same weakness: CWE-409

V. Comments for CVE-2026-43970

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