{"answers":{"affected":"3 open source packages ship an affected version, including github.com/slackhq/nebula. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-25793 in the wild and no public exploit code.","fix":"Upgrade github.com/slackhq/nebula to 1.10.3 or later.","what":"CVE-2026-25793 is a high-severity vulnerability in slackhq nebula, published on 6 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-25793 and fix it if it is affected.\n\nWhat it is: CVE-2026-25793 is a high-severity vulnerability in slackhq nebula, published on 6 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-25793 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/slackhq/nebula (Go): affected from 1.7.0; fixed in 1.10.3\n- github.com/slackhq/nebula (Go): affected from 1.7.0; fixed in 1.10.3\n- github.com/slackhq/nebula (Go): affected from 1.7.0; fixed in 1.10.3\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-2026-25793/ (Markdown: https://insights.sbomify.com/CVE-2026-25793/index.md)","id":"CVE-2026-25793","markdown":"https://insights.sbomify.com/CVE-2026-25793/index.md","name":"CVE-2026-25793","record":{"aliases":["CLEANSTART-2026-FB73701","CLEANSTART-2026-XI53576","CLEANSTART-2026-ZG76614","GHSA-69x3-g4r3-p962","GO-2026-4458","MINI-8qgr-99vw-p8xr"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Nebula overlay networking","requires_auth":"low_privilege","summary":"Attackers can bypass certificate blocklists in Nebula by exploiting ECDSA signature malleability when using non-default P256 certificates.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"nebula","vendor":"slack"}],"cvss":{"score":7.6,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"description":"Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.","ecosystems":["Go"],"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":"Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability","id":"CVE-2026-25793","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"ImageMagick has heap-buffer-overflow via signed integer overflow in WriteUHDRImage when writing UHDR images with large dimensions","id":"CVE-2026-25794"},"packages":[{"ecosystem":"Go","fixed":["1.10.3"],"introduced":["1.7.0"],"last_affected":[],"package":"github.com/slackhq/nebula","purl":null,"source":"GHSA-69x3-g4r3-p962"},{"ecosystem":"Go","fixed":["1.10.3"],"introduced":["1.7.0"],"last_affected":[],"package":"github.com/slackhq/nebula","purl":"pkg:golang/github.com/slackhq/nebula","source":"GHSA-69x3-g4r3-p962"},{"ecosystem":"Go","fixed":["1.10.3"],"introduced":["1.7.0"],"last_affected":[],"package":"github.com/slackhq/nebula","purl":"pkg:golang/github.com/slackhq/nebula","source":"GO-2026-4458"}],"prev":{"headline":"Greenshot Vulnerable to OS Command Injection via ExternalCommand Plugin","id":"CVE-2026-25792"},"products":["nebula"],"published":"2026-02-06","related":[{"cvss_score":8.8,"headline":"Path traversal in n/a","id":"CVE-2020-11498","kev_date_added":null,"published":"2020-04-02"}],"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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"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":"2026-02-09","vendors":["slackhq"]},"summary":"Attackers can bypass certificate blocklists in Nebula by exploiting ECDSA signature malleability when using non-default P256 certificates.","url":"https://insights.sbomify.com/CVE-2026-25793/"}