{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33542", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-20T18:05:11.832Z", "datePublished": "2026-03-26T22:32:13.733Z", "dateUpdated": "2026-03-26T22:32:13.733Z"}, "containers": {"cna": {"title": "Incus does not verify combined fingerprint when downloading images from simplestreams servers", "problemTypes": [{"descriptions": [{"cweId": "CWE-295", "lang": "en", "description": "CWE-295: Improper Certificate Validation", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "baseScore": 5.7, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N/E:P", "version": "4.0"}}], "references": [{"name": "https://github.com/lxc/incus/security/advisories/GHSA-p8mm-23gg-jc9r", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/lxc/incus/security/advisories/GHSA-p8mm-23gg-jc9r"}], "affected": [{"vendor": "lxc", "product": "incus", "versions": [{"version": "< 6.23.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-26T22:32:13.733Z"}, "descriptions": [{"lang": "en", "value": "Incus is a system container and virtual machine manager. Prior to version 6.23.0, a lack of validation of the image fingerprint when downloading from simplestreams image servers opens the door to image cache poisoning and under very narrow circumstances exposes other tenants to running attacker controlled images rather than the expected one. Version 6.23.0 patches the issue."}], "source": {"advisory": "GHSA-p8mm-23gg-jc9r", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Incus is a system container and virtual machine manager. Prior to version 6.23.0, a lack of validation of the image fingerprint when downloading from simplestreams image servers opens the door to image cache poisoning and under very narrow circumstances exposes other tenants to running attacker controlled images rather than the expected one. Version 6.23.0 patches the issue."}], "id": "CVE-2026-33542", "lastModified": "2026-03-26T23:16:20.113", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-26T23:16:20.113", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/lxc/incus/security/advisories/GHSA-p8mm-23gg-jc9r"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "github.com/lxc/incus: Incus: Image cache poisoning due to insufficient image fingerprint validation", "id": "2452019", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452019"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-354", "details": ["A flaw was found in Incus, a system container and virtual machine manager. A remote attacker could exploit a lack of validation of image fingerprints when downloading from simplestreams image servers. This vulnerability, under specific conditions, could lead to image cache poisoning, allowing an attacker to expose other tenants to running their controlled images instead of the expected ones."], "name": "CVE-2026-33542", "public_date": "2026-03-26T22:32:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33542\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33542\nhttps://github.com/lxc/incus/security/advisories/GHSA-p8mm-23gg-jc9r"], "statement": "This Important vulnerability in Incus, a system container and virtual machine manager, stems from insufficient image fingerprint validation during downloads from simplestreams image servers. Under specific conditions, this could lead to image cache poisoning, allowing an attacker to expose other tenants to running controlled images. This issue primarily affects community projects such as Fedora.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.23.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "incus", "source": "cna", "vendor": "lxc"}, "product": "incus", "vendor": "lxc"}], "analysis": {"en": {"generated_at": "2026-03-27T13:24:20.439022+00:00", "value": {"mitigation_remediation": ["Upgrade Incus to version 6.23.0 or later.", "If an upgrade is not immediately possible, limit or disable image downloads from untrusted simplestreams servers by configuring a whitelist of trusted registries.", "Consider disabling remote image fetch capabilities until the vulnerability is patched.", "Manually verify the fingerprints of downloaded images against vendor signatures before adding them to the cache."], "summary": {"action": "Immediate Patch", "impact": "Image cache poisoning leading to execution of attacker\u2011controlled container images"}, "threat_synthesis": {"affected_systems": "All Incus deployments running a version earlier than 6.23.0 are affected. The issue applies to the Incus product (LXC) used to manage system containers and virtual machines.", "description_and_impact": "Incus, the system container and virtual machine manager, fails to verify the combined fingerprint when downloading images from simplestreams servers. This weakness allows an attacker to create a malicious image that replaces an expected one in the local cache, potentially running unintended code within shared containers. The vulnerability stems from improper verification of certificate authenticity and failure to validate combined cryptographic hashes, corresponding to CWE\u2011295 and CWE\u2011354.", "risk_and_exploitability": "The CVSS score of 5.7 indicates moderate severity. Although EPSS data is not available and the vulnerability is not listed in CISA\u2019s KEV catalog, the attack is feasible whenever a host downloads an image from a simplestreams server. The relocation of the cached image requires access to the host\u2019s image storage, which can be achieved by legitimate image fetch requests. Consequently, the risk is moderate to high in multi\u2011tenant environments where isolated containers share the same image cache."}}}}, "created": "2026-03-27T08:31:31.073234+00:00", "updated": "2026-03-27T15:47:23.535139+00:00", "vendors": ["lxc", "lxc$PRODUCT$incus"]}