rekor — security advisory

{
  "id": "ae6e5301026fa696f51e0f5e2ef23c46b9979d5621273fff65634447c2a07348",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-48702",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-48702",
    "summary": "Rekor is a software supply chain transparency log. Starting in version 0.3.0 and prior to version 1.5.2, the `Package.Unmarshal()` function in `pkg/types/alpine/apk.go` decompresses the signature and control gzip members of an APK file into in-memory buffers without bounding the total decompressed size. The existing `max_apk_metadata_size` check (default 1MB) is only applied to individual tar entry header sizes after decompression completes, so it does not prevent a decompression bomb from consuming unbounded heap memory. An attacker can craft a gzip stream that compresses at a ~1000:1 ratio (e.g., 2MB compressed zeros → 2GB decompressed). When submitted as spec.package.content in an Alpine `ProposedEntry`, the server decompresses the full payload into memory during request processing, triggering a fatal Go runtime out-of-memory error or OS OOM-kill that cannot be caught by the server's recover() middleware. This is reachable via two unauthenticated endpoints, `POST /api/v1/log/entries (createLogEntry)` and `POST /api/v1/log/entries/retrieve (searchLogQuery)`. Both invoke `V001Entry.Canonicalize()` → `fetchExternalEntities()` → `apk.Unmarshal(packageData)`, which performs the unbounded decompression. Version 1.5.2 patches the issue. There is no effective workaround. Setting `max_request_body_size` reduces but does not eliminate exposure due to the ~1000:1 compression ratio (a 1MB body limit still allows ~1GB heap allocation). Setting `max_apk_metadata_size` has no effect on t",
    "evidence": "osv:DEBIAN-CVE-2026-48702",
    "products": [
      {
        "name": {
          "value": "rekor",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.3.10-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.3.9-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.4.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.4.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.4.3-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.5.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.5.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.5.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.5.3-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.5.3-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rekor",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.5.2-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "1.3.10-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.3.9-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.4.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.4.2-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.4.3-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.5.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.5.1-1",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-48702",
      "aliases": [
        "DEBIAN-CVE-2026-48702"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rekor",
            "purl": "pkg:deb/debian/rekor?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "1.3.10-1",
            "1.3.9-1",
            "1.4.0-1",
            "1.4.2-1",
            "1.4.3-1",
            "1.5.0-1",
            "1.5.1-1",
            "1.5.2-1",
            "1.5.3-1",
            "1.5.3-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48702.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.5.2-1"
                }
              ]
            }
          ],
          "package": {
            "name": "rekor",
            "purl": "pkg:deb/debian/rekor?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "1.3.10-1",
            "1.3.9-1",
            "1.4.0-1",
            "1.4.2-1",
            "1.4.3-1",
            "1.5.0-1",
            "1.5.1-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48702.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-24T09:47:31.854758553Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-48702"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-48702"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-48702",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429005,
  "published_at": "2026-08-13T14:17:01.427+00:00"
}