Bug 2499685 (CVE-2026-48702) - CVE-2026-48702 github.com/sigstore/rekor: Rekor: Denial of Service due to unbounded gzip decompression in Alpine APK parsing
Summary: CVE-2026-48702 github.com/sigstore/rekor: Rekor: Denial of Service due to unb...
Keywords:
Status: NEW
Alias: CVE-2026-48702
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-13 14:39 UTC by OSIDB Bzimport
Modified: 2026-08-15 08:28 UTC (History)
93 users (show)

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Description OSIDB Bzimport 2026-07-13 14:39:55 UTC 
Rekor's Package.Unmarshal() function in pkg/types/alpine/apk.go decompresses signature and control gzip members of APK files into in-memory buffers without bounding the total decompressed size. An attacker can craft a gzip stream with ~1000:1 compression ratio, causing the server to consume unbounded heap memory and trigger OOM-kill. Reachable via unauthenticated POST /api/v1/log/entries and POST /api/v1/log/entries/retrieve. Fixed in rekor 1.5.2.
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