{"id":"CVE-2026-115374","state":"PUBLISHED","title":"Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 Unsigned Header Bypass in Presigned S3 Upload URLs","description":"Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 contains a signature verification flaw in its built-in S3 server that allows presigned URL holders to inject unsigned x-amz-* headers. Attackers can add an unsigned X-Amz-Copy-Source header to a presigned upload URL to copy other bucket objects onto the granted key, disclosing their contents and ETags.","publishedAt":"2026-10-22T19:13:43.999Z","updatedAt":"2026-10-23T15:01:34.195Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["lxc incus"],"affected":[{"vendor":"lxc","product":"incus","packageURL":"pkg:golang/github.com/lxc/incus/v7/cmd/incusd","defaultStatus":"unaffected","versions":[{"version":"7.0.0","status":"affected","lessThan":"7.0.2","versionType":"semver"},{"version":"7.0.2","status":"unaffected","versionType":"semver"},{"version":"7.1.0","status":"affected","lessThan":"7.5.0","versionType":"semver"},{"version":"7.5.0","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/lxc/incus/security/advisories/GHSA-mmj7-8rgf-mx2h","https://www.vulncheck.com/advisories/incus-7.0.0-before-7.0.2-and-7.1.0-before-7.5.0-unsigned-header-bypass-in-presigned-s3-upload-urls"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:10:43.281Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/115xxx/CVE-2026-115374.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-115374","state":"PUBLISHED","datePublished":"2026-10-22T19:13:43.999Z","dateUpdated":"2026-10-23T15:01:34.195Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-22T11:24:28.627Z"},"containers":{"cna":{"title":"Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 Unsigned Header Bypass in Presigned S3 Upload URLs","descriptions":[{"lang":"en","value":"Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 contains a signature verification flaw in its built-in S3 server that allows presigned URL holders to inject unsigned x-amz-* headers. Attackers can add an unsigned X-Amz-Copy-Source header to a presigned upload URL to copy other bucket objects onto the granted key, disclosing their contents and ETags."}],"affected":[{"vendor":"lxc","product":"incus","packageURL":"pkg:golang/github.com/lxc/incus/v7/cmd/incusd","defaultStatus":"unaffected","versions":[{"version":"7.0.0","status":"affected","lessThan":"7.0.2","versionType":"semver"},{"version":"7.0.2","status":"unaffected","versionType":"semver"},{"version":"7.1.0","status":"affected","lessThan":"7.5.0","versionType":"semver"},{"version":"7.5.0","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/lxc/incus/security/advisories/GHSA-mmj7-8rgf-mx2h","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-mmj7-8rgf-mx2h)"},{"url":"https://www.vulncheck.com/advisories/incus-7.0.0-before-7.0.2-and-7.1.0-before-7.5.0-unsigned-header-bypass-in-presigned-s3-upload-urls","name":"VulnCheck Advisory: Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 Unsigned Header Bypass in Presigned S3 Upload URLs","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-22T19:13:43.999Z"},"datePublic":"2026-09-25T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0.0","versionEndExcluding":"7.0.2"},{"vulnerable":true,"criteria":"cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1.0","versionEndExcluding":"7.5.0"}]}]}],"credits":[{"lang":"en","value":"orenyomtov","type":"reporter"},{"lang":"en","value":"stgraber","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-23T14:48:25.416342Z","id":"CVE-2026-115374","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-23T15:01:34.195Z"}}]}}}