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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 h
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:db750ad50d44fa77af10d2db1d1f945c0e2163a1629cabe46d22bf5712d6d75c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_spdy"],"packageName":"cowlib","packageURL":"pkg:hex/cowlib","product":"cowlib","programFiles":["src/cow_spdy.erl"],"programRoutines":[{"name":"cow_spdy:parse/2"},{"name":"cow_spdy:inflate/2"},{"name":"cow_spdy:parse_headers/2"},{"name":"cow_spdy:parse_headers/4"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"2.16.1","status":"affected","version":"0.1.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:27c06558bec365ade9fe2c7facf15da9878343a90363bbed0040d19dce1815e4 · sha256:669de11937f1b74f… · /containers/cna/affected/0

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_spdy"],"packageName":"ninenines/cowlib","packageURL":"pkg:github/ninenines/cowlib","product":"cowlib","programFiles":["src/cow_spdy.erl"],"programRoutines":[{"name":"cow_spdy:parse/2"},{"name":"cow_spdy:inflate/2"},{"name":"cow_spdy:parse_headers/2"},{"name":"cow_spdy:parse_headers/4"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"16aad3fb9f81f5cda4d1706ff0c54237c619c282","status":"affected","version":"fad5c0049df…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:27c06558bec365ade9fe2c7facf15da9878343a90363bbed0040d19dce1815e4 · sha256:669de11937f1b74f… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_spdy"],"packageName":"cowlib","packageURL":"pkg:hex/cowlib","product":"cowlib","programFiles":["src/cow_spdy.erl"],"programRoutines":[{"name":"cow_spdy:parse/2"},{"name":"cow_spdy:inflate/2"},{"name":"cow_spdy:parse_headers/2"},{"name":"cow_spdy:parse_headers/4"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"2.16.1","status":"affected","version":"0.1.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:27c06558bec365ade9fe2c7facf15da9878343a90363bbed0040d19dce1815e4 · sha256:669de11937f1b74f… · /containers/cna/affected/0
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_spdy"],"packageName":"ninenines/cowlib","packageURL":"pkg:github/ninenines/cowlib","product":"cowlib","programFiles":["src/cow_spdy.erl"],"programRoutines":[{"name":"cow_spdy:parse/2"},{"name":"cow_spdy:inflate/2"},{"name":"cow_spdy:parse_headers/2"},{"name":"cow_spdy:parse_headers/4"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"16aad3fb9f81f5cda4d1706ff0c54237c619c282","status":"affected","version":"fad5c0049df…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:27c06558bec365ade9fe2c7facf15da9878343a90363bbed0040d19dce1815e4 · sha256:669de11937f1b74f… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:27c06558bec365ade9fe2c7facf15da9878343a90363bbed0040d19dce1815e4 · sha256:669de11937f1b74f… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-409","description":"CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:27c06558bec365ade9fe2c7facf15da9878343a90363bbed0040d19dce1815e4 · sha256:669de11937f1b74f… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["related","third-party-advisory"],"url":"https://cna.erlef.org/cves/CVE-2026-43970.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27c06558bec365ade9fe2c7facf15da9878343a90363bbed0040d19dce1815e4 · sha256:669de11937f1b74f… · /containers/cna/references/0
{"tags":["patch"],"url":"https://github.com/ninenines/cowlib/commit/16aad3fb9f81f5cda4d1706ff0c54237c619c282"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27c06558bec365ade9fe2c7facf15da9878343a90363bbed0040d19dce1815e4 · sha256:669de11937f1b74f… · /containers/cna/references/2
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-43970"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:27c06558bec365ade9fe2c7facf15da9878343a90363bbed0040d19dce1815e4 · sha256:669de11937f1b74f… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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