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Security advisory

Type: advisorySources: OSVCVE: CVE-2026-15978

SGLang contains a model weight exfiltration vulnerability when no API keys are configured, as SGLang will expose two endpoints that allow a remote attacker to trigger distributed weight broadcasting using NCCL and then triggering data transfer, attackers can exfiltrate all model weights.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-15978
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 22:56 UTC · Revision 1

Source evidence

CVE-2026-15978

core-osv · Original source

Published 30 Jul 2026, 18:08 UTC

SGLang contains a model weight exfiltration vulnerability when no API keys are configured, as SGLang will expose two endpoints that allow a remote attacker to trigger distributed weight broadcasting using NCCL and then triggering data transfer, attackers can exfiltrate all model weights.

osv:CVE-2026-15978
Complete source record
{
  "id": "908527ec8dcfc97033d55a002e839b3c3a376bd078f6429b2e7b87b8b07525bc",
  "url": "https://osv.dev/vulnerability/CVE-2026-15978",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-15978",
    "summary": "SGLang contains a model weight exfiltration vulnerability when no API keys are configured, as SGLang will expose two endpoints that allow a remote attacker to trigger distributed weight broadcasting using NCCL and then triggering data transfer, attackers can exfiltrate all model weights.",
    "evidence": "osv:CVE-2026-15978",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-15978",
      "aliases": [
        "CVE-2026-15978",
        "GHSA-cpqq-22v3-2wfm"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/sgl-project/sglang",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "f63458b5beaceabbd9d749b9fc956370e1b649e6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "v0.5.15"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:lmsys:sglang:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.5.15"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.5.15",
            "gateway-v0.3.1",
            "gateway-v0.3.0",
            "v0.5.6.post2",
            "gateway-v0.2.4",
            "v0.5.6.post1",
            "v0.5.6",
            "v0.5.5",
            "v0.5.5.post3",
            "gateway-v0.2.3",
            "v0.5.5.post2",
            "v0.5.5.post1",
            "v0.5.4.post3",
            "v0.5.4.post2",
            "gateway-v0.2.2",
            "v0.5.4.post1",
            "v0.5.4",
            "gateway-v0.2.1",
            "v0.5.3.post3",
            "v0.5.3.post2",
            "gateway-v0.2.0",
            "v0.5.3.post1",
            "v0.5.3",
            "v0.5.3rc2",
            "v0.5.3rc1",
            "v0.5.3rc0",
            "v0.5.2",
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            "v0.5.2rc1",
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            "v0.5.1.post3",
            "v0.5.1.post2",
            "v0.5.1.post1",
            "v0.5.1",
            "v0.5.0rc2",
            "v0.5.0rc1",
            "v0.5.0rc0",
            "gateway-v0.1.9",
            "v0.4.10.post2",
            "v0.4.10.post1",
            "gateway-v0.1.8",
            "gateway-v0.1.7",
            "v0.4.10",
            "v0.4.9.post6",
            "v0.4.9.post5",
            "v0.4.9.post4",
            "v0.4.9.post3",
            "gateway-v0.1.6",
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            "gateway-v0.1.5",
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            "v0.4.6.post3",
            "v0.4.6.post2",
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            "v0.4.6",
            "v0.4.5.post3",
            "v0.4.5.post2",
            "v0.4.5.post1",
            "v0.4.5",
            "v0.4.4.post4",
            "v0.4.4.post3",
            "v0.4.4.post2",
            "v0.4.4.post1",
            "v0.4.4",
            "v0.4.3.post4",
            "v0.4.3.post3",
            "v0.4.3.post2",
            "v0.4.3.post1",
            "v0.4.3",
            "v0.4.2.post4",
            "v0.4.2.post3",
            "v0.4.2.post2",
            "v0.4.2.post1",
            "v0.4.2",
            "v0.4.1.post7",
            "v0.4.1.post6",
            "v0.4.1.post5",
            "v0.4.1.post4",
            "v0.4.1.post3",
            "v0.4.1.post2",
            "v0.4.1.post1",
            "v0.4.1",
            "v0.4.0.post2",
            "v0.4.0.post1",
            "v0.4.0",
            "v0.3.6.post3",
            "v0.3.6.post2",
            "v0.3.6.post1",
            "v0.3.6",
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            "v0.3.5.post1",
            "v0.3.5",
            "v0.3.4.post2",
            "v0.3.4.post1",
            "v0.3.4",
            "v0.3.3.post1",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1.post3",
            "v0.3.1.post2",
            "v0.3.1.post1",
            "v0.3.0",
            "v0.2.15",
            "v0.2.14.post2",
            "v0.2.14.post1",
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            "v0.2.6",
            "v0.2.5",
            "v0.2.0",
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            "v0.1.23",
            "v0.1.22",
            "v0.1.21",
            "v0.1.20",
            "v0.1.19",
            "v0.1.18",
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            "v0.1.16",
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            "v0.1.12",
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            "v0.1.9",
            "v0.1.8",
            "v0.1.7",
            "v0.1.6",
            "v0.1.5",
            "v0.1.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15978.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.080346724Z",
      "provider": "osv",
      "references": [
        "https://thoughts.apoorvdayal.com/posts/sglang-disclosures/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15978.json",
        "https://github.com/sgl-project/sglang/security/advisories/GHSA-cpqq-22v3-2wfm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-15978"
      ],
      "provider_metadata": {
        "cna_assigner": "certcc",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15978.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-15978",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490672,
  "published_at": "2026-07-30T18:08:29.228+00:00"
}