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CVE-2026-43972

Origin Validation Error vulnerability in ninenines gun (gun_http2 module) allows cross-origin cookie injection via unvalidated HTTP/2 PUSH_PROMISE authority. In gun_http2:push_promise_frame/7, the :authority pseudo-header from an incoming PUSH_PROMISE frame is stored verbatim into the promised stream record without checking that it matches the connection's origin. When gun_http2:headers_frame/9 later processes the response headers for the promised stream, it calls gun_cookies:set_cookie_header/
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:45bd4fa0bf5a70d9f8394b0b9d3256d4e40f0d16d764682c4c447e56349170f1
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

{"cpes":["cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["gun_http2"],"packageName":"gun","packageURL":"pkg:hex/gun","product":"gun","programFiles":["src/gun_http2.erl"],"programRoutines":[{"name":"gun_http2:push_promise_frame/7"},{"name":"gun_http2:headers_frame/9"}],"repo":"https://github.com/ninenines/gun","vendor":"ninenines","versions":[{"lessThan":"2.4.0","status":"affected","version":"2.0.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78f1c4f5fcdd851f75b714f8416e3bd62344a03a67e26055284e816318419bf8 · sha256:3aec1dcf6f329f85… · /containers/cna/affected/0

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["gun_http2"],"packageName":"ninenines/gun","packageURL":"pkg:github/ninenines/gun","product":"gun","programFiles":["src/gun_http2.erl"],"programRoutines":[{"name":"gun_http2:push_promise_frame/7"},{"name":"gun_http2:headers_frame/9"}],"repo":"https://github.com/ninenines/gun.git","vendor":"ninenines","versions":[{"lessThan":"567863ff53802fed21c3b3f25812db7f7ae29676","status":"affected","version":"871989eef53663285c165fdfb83a5918ebe00d41","versionType":"git"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78f1c4f5fcdd851f75b714f8416e3bd62344a03a67e26055284e816318419bf8 · sha256:3aec1dcf6f329f85… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"cpes":["cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["gun_http2"],"packageName":"gun","packageURL":"pkg:hex/gun","product":"gun","programFiles":["src/gun_http2.erl"],"programRoutines":[{"name":"gun_http2:push_promise_frame/7"},{"name":"gun_http2:headers_frame/9"}],"repo":"https://github.com/ninenines/gun","vendor":"ninenines","versions":[{"lessThan":"2.4.0","status":"affected","version":"2.0.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78f1c4f5fcdd851f75b714f8416e3bd62344a03a67e26055284e816318419bf8 · sha256:3aec1dcf6f329f85… · /containers/cna/affected/0
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["gun_http2"],"packageName":"ninenines/gun","packageURL":"pkg:github/ninenines/gun","product":"gun","programFiles":["src/gun_http2.erl"],"programRoutines":[{"name":"gun_http2:push_promise_frame/7"},{"name":"gun_http2:headers_frame/9"}],"repo":"https://github.com/ninenines/gun.git","vendor":"ninenines","versions":[{"lessThan":"567863ff53802fed21c3b3f25812db7f7ae29676","status":"affected","version":"871989eef53663285c165fdfb83a5918ebe00d41","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78f1c4f5fcdd851f75b714f8416e3bd62344a03a67e26055284e816318419bf8 · sha256:3aec1dcf6f329f85… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:78f1c4f5fcdd851f75b714f8416e3bd62344a03a67e26055284e816318419bf8 · sha256:3aec1dcf6f329f85… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-346","description":"CWE-346 Origin Validation Error","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78f1c4f5fcdd851f75b714f8416e3bd62344a03a67e26055284e816318419bf8 · sha256:3aec1dcf6f329f85… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["related","third-party-advisory"],"url":"https://cna.erlef.org/cves/CVE-2026-43972.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78f1c4f5fcdd851f75b714f8416e3bd62344a03a67e26055284e816318419bf8 · sha256:3aec1dcf6f329f85… · /containers/cna/references/0
{"tags":["patch"],"url":"https://github.com/ninenines/gun/commit/567863ff53802fed21c3b3f25812db7f7ae29676"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78f1c4f5fcdd851f75b714f8416e3bd62344a03a67e26055284e816318419bf8 · sha256:3aec1dcf6f329f85… · /containers/cna/references/2
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-43972"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78f1c4f5fcdd851f75b714f8416e3bd62344a03a67e26055284e816318419bf8 · sha256:3aec1dcf6f329f85… · /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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