{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89321", "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "state": "PUBLISHED", "assignerShortName": "eclipse", "dateReserved": "2026-09-11T13:59:27.803Z", "datePublished": "2026-09-14T08:13:03.579Z", "dateUpdated": "2026-09-14T10:30:31.933Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "shortName": "eclipse", "dateUpdated": "2026-09-14T08:13:03.579Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-409", "description": "CWE-409 Improper handling of highly compressed data (data amplification)", "type": "CWE"}]}], "affected": [{"vendor": "Eclipse Foundation", "product": "Eclipse OpenVSX", "versions": [{"status": "affected", "version": "0.20.0", "lessThan": "1.2.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Publishing limits the compressed size of a VSIX (ovsx.publishing.max-content-size, 512 MB by default) but nothing limited how large an entry becomes when opened.\n\n\n\n\nOn the first request to /vscode/unpkg/{namespace}/{extension}/{version}/{path}, WebResourceService opened the entry with ZipFile.getInputStream() and passed the decompressed stream to Files.copy(), which ran to the end of the stream without counting bytes written. The result was cached under java.io.tmpdir, and that cache evicted by entry count (150), not by size, so it placed no bound on disk usage.\n\n\n\n\nA publisher with access only to their own namespace could therefore upload a small, highly compressible VSIX and cause the server to write far larger files to the temp filesystem \u2014 repeating with different files or versions, since a repeat request is served from the cache.\n\n\n\n\nImpact observed: the temp filesystem filled; requests for files not already cached returned 500 with No space left on device; a failed extraction left a partial cache file that blocked later attempts at that path; publishing failed with Failed to read extension file. Metadata and already-cached files kept working, and the server did not stop.\n\n\n\n\nTriggering the extraction needs no authentication \u2014 only the upload does.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Publishing limits the compressed size of a VSIX (ovsx.publishing.max-content-size, 512 MB by default) but nothing limited how large an entry becomes when opened.</p>\n<p>On the first request to /vscode/unpkg/{namespace}/{extension}/{version}/{path}, WebResourceService opened the entry with ZipFile.getInputStream() and passed the decompressed stream to Files.copy(), which ran to the end of the stream without counting bytes written. The result was cached under java.io.tmpdir, and that cache evicted by entry count (150), not by size, so it placed no bound on disk usage.</p>\n<p>A publisher with access only to their own namespace could therefore upload a small, highly compressible VSIX and cause the server to write far larger files to the temp filesystem \u2014 repeating with different files or versions, since a repeat request is served from the cache.</p>\n<p>Impact observed: the temp filesystem filled; requests for files not already cached returned 500 with No space left on device; a failed extraction left a partial cache file that blocked later attempts at that path; publishing failed with Failed to read extension file. Metadata and already-cached files kept working, and the server did not stop.</p>\n<p>Triggering the extraction needs no authentication \u2014 only the upload does.</p>"}]}], "references": [{"url": "https://github.com/eclipse-openvsx/openvsx/security/advisories/GHSA-h685-gqw7-fqw7"}, {"url": "https://github.com/eclipse-openvsx/openvsx/pull/2060"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW", "baseSeverity": "MEDIUM", "baseScore": 4.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"}}], "credits": [{"lang": "en", "value": "Jihun Kim", "type": "reporter"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-14T10:30:07.647299Z", "id": "CVE-2026-89321", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-14T10:30:31.933Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Eclipse OpenVSX", "vendor": "Eclipse Foundation", "versions": [{"lessThan": "1.2.0", "status": "affected", "version": "0.20.0", "versionType": "semver"}]}], "source": "emo@eclipse.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Publishing limits the compressed size of a VSIX (ovsx.publishing.max-content-size, 512 MB by default) but nothing limited how large an entry becomes when opened.\n\n\n\n\nOn the first request to /vscode/unpkg/{namespace}/{extension}/{version}/{path}, WebResourceService opened the entry with ZipFile.getInputStream() and passed the decompressed stream to Files.copy(), which ran to the end of the stream without counting bytes written. The result was cached under java.io.tmpdir, and that cache evicted by entry count (150), not by size, so it placed no bound on disk usage.\n\n\n\n\nA publisher with access only to their own namespace could therefore upload a small, highly compressible VSIX and cause the server to write far larger files to the temp filesystem \u2014 repeating with different files or versions, since a repeat request is served from the cache.\n\n\n\n\nImpact observed: the temp filesystem filled; requests for files not already cached returned 500 with No space left on device; a failed extraction left a partial cache file that blocked later attempts at that path; publishing failed with Failed to read extension file. Metadata and already-cached files kept working, and the server did not stop.\n\n\n\n\nTriggering the extraction needs no authentication \u2014 only the upload does."}], "id": "CVE-2026-89321", "lastModified": "2026-09-14T09:17:01.797", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "emo@eclipse.org", "type": "Secondary"}]}, "published": "2026-09-14T09:17:01.797", "references": [{"source": "emo@eclipse.org", "url": "https://github.com/eclipse-openvsx/openvsx/pull/2060"}, {"source": "emo@eclipse.org", "url": "https://github.com/eclipse-openvsx/openvsx/security/advisories/GHSA-h685-gqw7-fqw7"}], "sourceIdentifier": "emo@eclipse.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-409"}], "source": "emo@eclipse.org", "type": "Primary"}]}

{}

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