CVE-2026-32766

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{"affected": [{"affectedData": [{"product": "tokio-tar", "vendor": "astral-sh", "versions": [{"status": "affected", "version": "< 0.6.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:astral:astral-tokio-tar:*:*:*:*:*:rust:*:*", "matchCriteriaId": "725A3E2E-B367-4AE8-AD96-B93A99C035F8", "versionEndExcluding": "0.6.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "astral-tokio-tar is a tar archive reading/writing library for async Rust. In versions 0.5.6 and earlier, malformed PAX extensions were silently skipped when parsing tar archives. This silent skipping (rather than rejection) of invalid PAX extensions could be used as a building block for a parser differential, for example by silently skipping a malformed GNU \u201clong link\u201d extension so that a subsequent parser would misinterpret the extension. In practice, exploiting this behavior in astral-tokio-tar requires a secondary misbehaving tar parser, i.e. one that insufficiently validates malformed PAX extensions and interprets them rather than skipping or erroring on them. This vulnerability is considered low-severity as it requires a separate vulnerability against any unrelated tar parser. This issue has been fixed in version 0.6.0."}, {"lang": "es", "value": "astral-tokio-tar es una biblioteca de lectura/escritura de archivos tar para Rust as\u00edncrono. En las versiones 0.5.6 y anteriores, las extensiones PAX malformadas se omit\u00edan silenciosamente al analizar archivos tar. Esta omisi\u00f3n silenciosa (en lugar de rechazo) de extensiones PAX no v\u00e1lidas podr\u00eda usarse como un bloque de construcci\u00f3n para un diferencial de analizador, por ejemplo, omitiendo silenciosamente una extensi\u00f3n GNU 'long link' malformada para que un analizador posterior malinterpretara la extensi\u00f3n. En la pr\u00e1ctica, explotar este comportamiento en astral-tokio-tar requiere un analizador tar secundario con comportamiento incorrecto, es decir, uno que valide insuficientemente las extensiones PAX malformadas y las interprete en lugar de omitirlas o generar un error por ellas. Esta vulnerabilidad se considera de baja gravedad ya que requiere una vulnerabilidad separada contra cualquier analizador tar no relacionado. Este problema ha sido corregido en la versi\u00f3n 0.6.0."}], "id": "CVE-2026-32766", "lastModified": "2026-06-17T10:36:20.847", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 1.7, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "UNREPORTED", "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": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/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": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-32766", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-20T16:56:46.912673Z", "version": "2.0.3"}}]}, "published": "2026-03-20T00:16:18.100", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/astral-sh/tokio-tar/commit/e5e0139cae4577eeedf5fc16b65e690bf988ce52"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/astral-sh/tokio-tar/security/advisories/GHSA-6gx3-4362-rf54"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-436"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "astral-tokio-tar: astral-tokio-tar: Potential archive misinterpretation via malformed PAX extensions", "id": "2449371", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449371"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-1286", "details": ["A flaw was found in astral-tokio-tar, a software component for handling tar archives. This flaw causes malformed PAX (Portable Archive eXchange) extensions within an archive to be silently ignored. An attacker could leverage this to create a specially crafted archive that, when processed by astral-tokio-tar and then by another vulnerable tar program, could be interpreted differently. This 'parser differential' might lead to misinterpretation of the archive's contents, but it requires a separate vulnerability in the secondary tar program for exploitation."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-32766", "package_state": [{"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "openshift-sandboxed-containers/osc-monitor-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "openshift-sandboxed-containers/osc-operator-bundle", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "openshift-sandboxed-containers/osc-podvm-builder-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "openshift-sandboxed-containers/osc-podvm-payload-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "openshift-sandboxed-containers/osc-rhel9-operator", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "trustee", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "trustee-guest-components", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "trustee-guest-components", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "kata-containers", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-20T00:07:36Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-32766\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-32766\nhttps://github.com/astral-sh/tokio-tar/commit/e5e0139cae4577eeedf5fc16b65e690bf988ce52\nhttps://github.com/astral-sh/tokio-tar/security/advisories/GHSA-6gx3-4362-rf54"], "statement": "This is a LOW impact flaw in `astral-tokio-tar` where malformed PAX extensions are silently ignored, potentially leading to a parser differential. Exploitation requires a secondary, vulnerable tar program that misinterprets these extensions. Red Hat products are only affected if they integrate `astral-tokio-tar` with such a vulnerable secondary parser.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.6.0)"}}], "enrichment": {"confidence": 91.0, "confidence_source": "matching", "scores": [{"score": 91.0, "source": "matching"}]}, "original": {"product": "tokio-tar", "source": "cna", "vendor": "astral-sh"}, "product": "tokio-tar", "vendor": "astral"}], "analysis": {"en": {"generated_at": "2026-03-20T13:27:46.616321+00:00", "value": {"mitigation_remediation": ["Upgrade astral\u2011tokio\u2011tar to version\u00a00.6.0 or later", "Check the upstream project for any additional patches or advisories"], "summary": {"action": "Apply Patch", "impact": "Limited Attack Potential due to parser differential"}, "threat_synthesis": {"affected_systems": "The affected product is astral\u2011sh:tokio\u2011tar, a Rust tar archive library. Any installation using version\u00a00.5.6 or earlier is vulnerable. The issue was corrected in version\u00a00.6.0. No other versions are listed as impacted.", "description_and_impact": "Astral\u2011tokio\u2011tar\u2019s tar archive parser silently ignores malformed PAX extensions in versions\u00a00.5.6 and earlier. This silent skipping, rather than rejecting them, could become part of a parser differential attack. If an adversary supplies an archive that contains malformed GNU \u201clong link\u201d PAX entries, the tokio\u2011tar library will drop those entries and leave them hidden. A second, unrelated tar parser that does not share this silent\u2011skip behaviour may still interpret the malformed entries, causing that parser to misread or misinterpret the archive, potentially leading to unexpected behaviour or security holes. The vulnerability is classified as low\u2011severity because it requires a separate flaw in another, unrelated tar parser for exploitable impact.", "risk_and_exploitability": "The CVSS score is 1.7, indicating a very low base severity. EPSS is not available, and the vulnerability is not listed in the CISA KEV catalog, further suggesting low exploitation likelihood. Exploitation requires a second, malicious tar parser that inadequately validates PAX extensions, which is uncommon. Therefore the overall risk is considered low but still recommend prompt mitigation."}}}}, "created": "2026-03-20T08:54:11.649133+00:00", "updated": "2026-03-20T14:14:40.314241+00:00", "vendors": ["astral", "astral$PRODUCT$tokio-tar"]}