{"apiVersion":"1.0","identifier":"CVE-2026-48702","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.","publishedAt":"2026-08-13T14:17:01","lastModifiedAt":"2026-08-13T16:18:05","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-48702","cvssScore":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","epssProbability":0.00324,"riskScore":0.77,"affectedProduct":"Rekor","affectedVersions":">=0.3.0,<1.5.2","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-48702","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-48702","en":"https://www.redsauce.net/en/cves/CVE-2026-48702","fr":"https://www.redsauce.net/fr/cves/CVE-2026-48702","pt":"https://www.redsauce.net/pt/cves/CVE-2026-48702","de":"https://www.redsauce.net/de/cves/CVE-2026-48702","sk":"https://www.redsauce.net/sk/cves/CVE-2026-48702","el":"https://www.redsauce.net/el/cves/CVE-2026-48702"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-48702"}}