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CVE-2026-48702— Rekor has an OOM Condition due to Unbounded gzip Decompression in Alpine APK Parsing Logic

Quick assessment

Affected
sigstore rekor
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

sigstore rekor是sigstore组织的一个基于区块链的软件供应链签名透明度日志。 sigstore rekor 0.3.0版本至1.5.2之前版本存在资源管理错误漏洞，该漏洞源于Package.Unmarshal()函数在pkg/types/alpine/apk.go中解压APK文件时未限制总解压大小，攻击者可利用高压缩比gzip流导致内存耗尽，造成拒绝服务。

CVSS 7.5 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
sigstore rekor >= 0.3.0, < 1.5.2 affected
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I. Basic Information for CVE-2026-48702

Vulnerability Information
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Vulnerability Title
Rekor has an OOM Condition due to Unbounded gzip Decompression in Alpine APK Parsing Logic
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
sigstore rekor 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sigstore rekor是sigstore组织的一个基于区块链的软件供应链签名透明度日志。 sigstore rekor 0.3.0版本至1.5.2之前版本存在资源管理错误漏洞，该漏洞源于Package.Unmarshal()函数在pkg/types/alpine/apk.go中解压APK文件时未限制总解压大小，攻击者可利用高压缩比gzip流导致内存耗尽，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sigstore rekor >= 0.3.0, < 1.5.2 -

II. Public POCs for CVE-2026-48702

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 12375 chars
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III. Intelligence Information for CVE-2026-48702

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Vendor Advisories for CVE-2026-48702 (1)

IV. Related Vulnerabilities

Same product: rekor
Same vendor: sigstore
Same weakness: CWE-770

V. Comments for CVE-2026-48702

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