CVE-2026-63209

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{"bugzilla": {"description": "github.com/klauspost/compress: klauspost/compress: Denial of Service via integer overflow in dictionary processing", "id": "2543236", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543236"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-823", "details": ["compress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceeding MaxInt64. When Dict.Encode() is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access via unsafe.Pointer arithmetic, crashing the process with SIGSEGV. This issue has been patched in version 1.18.7.", "A flaw was found in the klauspost/compress package. A remote attacker can exploit this vulnerability by supplying a specially crafted compression dictionary with an excessively large repeat value, triggering an integer overflow. When the dictionary is subsequently processed, this overflow leads to out-of-bounds memory access, crashing the application and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-63209", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Under investigation", "package_name": "cryostat/cryostat-storage-rhel9", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2", "fix_state": "Under investigation", "package_name": "custom-metrics-autoscaler/custom-metrics-autoscaler-adapter-rhel9", "product_name": "Custom Metric Autoscaler operator for Red Hat Openshift"}, {"cpe": "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2", "fix_state": "Under investigation", "package_name": "custom-metrics-autoscaler/custom-metrics-autoscaler-admission-webhooks-rhel9", "product_name": "Custom Metric Autoscaler operator for Red Hat Openshift"}, {"cpe": "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2", "fix_state": "Under investigation", 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"cpe:/a:redhat:quay:3", "fix_state": "Under investigation", "package_name": "quay/quay-rhel9", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Under investigation", "package_name": "rhtas/ec-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}], "public_date": "2026-09-29T14:58:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63209\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63209\nhttps://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536\nhttps://github.com/klauspost/compress/releases/tag/v1.18.7\nhttps://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.18.7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "compress", "source": "cna", "vendor": "klauspost"}, "product": "compress", "vendor": "klauspost"}], "created": "2026-09-30T01:30:17.836029+00:00", "updated": "2026-10-02T02:00:14.051294+00:00", "vendors": ["klauspost", "klauspost$PRODUCT$compress"]}