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CVE-2026-54776

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, a CoreWCF service hosted on Unix Domain Sockets with PosixIdentity client credentials can accept connections that skip the application/unixposix stream upgrade before dispatching messages, bypassing framing-layer identity checks in UnixPosixIdentitySecurityUpgradeProvider. This issue is fixed in versions 1.8.1 and 1.9.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7c21e7c474b4cd57dc317a49dbc0ebc393aa00998099e8176e50c2a09de037b4
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"CoreWCF","vendor":"CoreWCF","versions":[{"status":"affected","version":">= 1.9.0, < 1.9.1"},{"status":"affected","version":"< 1.8.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1884fb19d1f5a2df383c285ba8489edaeda88cf97c0baa37b9668bfae4c0d330 · sha256:7b9c95766c4ba5b8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":4.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1884fb19d1f5a2df383c285ba8489edaeda88cf97c0baa37b9668bfae4c0d330 · sha256:7b9c95766c4ba5b8… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1884fb19d1f5a2df383c285ba8489edaeda88cf97c0baa37b9668bfae4c0d330 · sha256:7b9c95766c4ba5b8… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"https://github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1884fb19d1f5a2df383c285ba8489edaeda88cf97c0baa37b9668bfae4c0d330 · sha256:7b9c95766c4ba5b8… · /containers/cna/references/1
{"name":"https://github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1884fb19d1f5a2df383c285ba8489edaeda88cf97c0baa37b9668bfae4c0d330 · sha256:7b9c95766c4ba5b8… · /containers/cna/references/2
{"name":"https://github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1884fb19d1f5a2df383c285ba8489edaeda88cf97c0baa37b9668bfae4c0d330 · sha256:7b9c95766c4ba5b8… · /containers/cna/references/3
{"name":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1884fb19d1f5a2df383c285ba8489edaeda88cf97c0baa37b9668bfae4c0d330 · sha256:7b9c95766c4ba5b8… · /containers/cna/references/4
{"name":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1884fb19d1f5a2df383c285ba8489edaeda88cf97c0baa37b9668bfae4c0d330 · sha256:7b9c95766c4ba5b8… · /containers/cna/references/5
{"name":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1884fb19d1f5a2df383c285ba8489edaeda88cf97c0baa37b9668bfae4c0d330 · sha256:7b9c95766c4ba5b8… · /containers/cna/references/0

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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