{"id":"CVE-2026-48702","revision":"73df2c1b8a804b7197599f1c060e2974","records":[{"revision":"73df2c1b8a804b7197599f1c060e2974","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-48702","aliases":[],"title":"Rekor has an OOM Condition due to Unbounded gzip Decompression in Alpine APK Parsing Logic","description":"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 this vulnerability since the check is applied after decompression.","state":0,"publishedAt":"2026-08-13T13:14:19.324+00:00","modifiedAt":"2026-08-13T15:16:26.293+00:00","affected":[{"ecosystem":"Vendor product","name":"rekor","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"sigstore\",\n                    \"product\": \"rekor\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 0.3.0, < 1.5.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/sigstore/rekor/security/advisories/GHSA-47q9-m4ww-924m"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-48702","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-48702","identifiers":["CVE-2026-48702"]},"retained":false,"historicalAffected":[]}],"coverage":[]}