{"answers":{"affected":"4 open source packages ship an affected version, including CoreWCF.UnixDomainSocket.","exploited":"There is no known exploitation of CVE-2026-54776 in the wild and no public exploit code.","fix":"Upgrade CoreWCF.UnixDomainSocket to a fixed version for your release line: 1.8.1 or 1.9.1.","what":"CVE-2026-54776 is a medium-severity authentication bypass vulnerability in CoreWCF, published on 8 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-54776 and fix it if it is affected.\n\nWhat it is: CVE-2026-54776 is a medium-severity authentication bypass vulnerability in CoreWCF, published on 8 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-54776 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- CoreWCF.UnixDomainSocket (NuGet): affected all versions; fixed in 1.8.1\n- CoreWCF.UnixDomainSocket (NuGet): affected all versions; fixed in 1.8.1\n- CoreWCF.UnixDomainSocket (NuGet): affected from 1.9.0; fixed in 1.9.1\n- CoreWCF.UnixDomainSocket (NuGet): affected from 1.9.0; fixed in 1.9.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-54776/ (Markdown: https://insights.sbomify.com/CVE-2026-54776/index.md)","id":"CVE-2026-54776","markdown":"https://insights.sbomify.com/CVE-2026-54776/index.md","name":"CVE-2026-54776","record":{"aliases":["GHSA-wjpq-6766-7f5j"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"CoreWCF library","requires_auth":"low_privilege","summary":"Attackers can bypass identity checks in CoreWCF Unix Domain Socket services by skipping security upgrades, requiring specific PosixIdentity configurations.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":4.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"}],"description":"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.","ecosystems":["NuGet"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade","id":"CVE-2026-54776","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"NuGet","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":4,"n_references":6,"next":{"headline":"CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance","id":"CVE-2026-54777"},"packages":[{"ecosystem":"NuGet","fixed":["1.8.1"],"introduced":["0"],"last_affected":[],"package":"CoreWCF.UnixDomainSocket","purl":null,"source":"GHSA-wjpq-6766-7f5j"},{"ecosystem":"NuGet","fixed":["1.8.1"],"introduced":["0"],"last_affected":[],"package":"CoreWCF.UnixDomainSocket","purl":"pkg:nuget/CoreWCF.UnixDomainSocket","source":"GHSA-wjpq-6766-7f5j"},{"ecosystem":"NuGet","fixed":["1.9.1"],"introduced":["1.9.0"],"last_affected":[],"package":"CoreWCF.UnixDomainSocket","purl":null,"source":"GHSA-wjpq-6766-7f5j"},{"ecosystem":"NuGet","fixed":["1.9.1"],"introduced":["1.9.0"],"last_affected":[],"package":"CoreWCF.UnixDomainSocket","purl":"pkg:nuget/CoreWCF.UnixDomainSocket","source":"GHSA-wjpq-6766-7f5j"}],"prev":{"headline":"CoreWCF: Kafka consume pump halts permanently on a Kafka tombstone (null-value record), causing persistent endpoint denial of service.","id":"CVE-2026-54775"},"products":["CoreWCF"],"published":"2026-07-08","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-09","vendors":["CoreWCF"]},"summary":"Attackers can bypass identity checks in CoreWCF Unix Domain Socket services by skipping security upgrades, requiring specific PosixIdentity configurations.","url":"https://insights.sbomify.com/CVE-2026-54776/"}