compress zstd: Panic on two-block frames

{
  "id": "54f2fe83964b9762670e0d4942a061d06785c2cac1013f4aa9a790420cb7a46d",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116591",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "compress zstd: Panic on two-block frames",
    "summary": "compress provides various compression algorithms. Prior to 1.20.2, the zstd DecodeAll and streaming decoder paths can panic when a crafted two-block frame reaches huff0.ReadTable with an FSE normalized count of 32768 that readNCount stores in int16 as -32768. The wrapped count allows buildDtable to retain stale fse.Scratch decode-table state from the prior block, and nextFast then derives an out-of-range state and indexes beyond the table instead of returning a decode error. Both blocks are required to preserve and then reuse the stale state, allowing untrusted zstd input to crash an application. This issue is fixed in version 1.20.2.",
    "evidence": "cve:CVE-2026-116591",
    "products": [
      {
        "name": {
          "value": "compress",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-116591",
      "aliases": [
        "CVE-2026-116591"
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 8.7,
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE"
          }
        }
      ],
      "affected": [
        {
          "vendor": "klauspost",
          "product": "compress",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.20.2"
            }
          ]
        }
      ],
      "modified": "2026-10-27T14:16:30.395Z",
      "provider": "cve",
      "references": [
        "https://github.com/klauspost/compress/security/advisories/GHSA-fpmh-frq8-7rj8",
        "https://github.com/klauspost/compress/commit/7f5d8528720c895a6106f201719f87eb030a565d",
        "https://github.com/klauspost/compress/releases/tag/v1.20.2"
      ],
      "provider_metadata": {
        "adp": [
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            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-116591",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-27T13:46:04.382421Z"
                  }
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            "providerMetadata": {
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              "shortName": "CISA-ADP",
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        "cna": {
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          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-26T21:55:20.476Z"
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    "related_cves": [
      {
        "value": "CVE-2026-116591",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 392647,
  "published_at": "2026-10-26T21:54:33.109+00:00"
}