CVE-2026-48702Network attack vectorHinoki check available

Unauthenticated server crash via unbounded gzip decompression

Published Aug 13, 2026 · Updated Aug 13, 2026

Denial of service in Sigstore Rekor 0.3.0 through 1.5.1 allows remote attackers to crash the server via a crafted Alpine APK. Package.Unmarshal() in pkg/types/alpine/apk.go expands APK signature and control gzip members into memory before enforcing per-entry size limits, allowing a small compressed request to exhaust the heap. The unauthenticated create and retrieve API endpoints reach this path, and the resulting Go runtime OOM or OS OOM-kill terminates service.

CVSS severity7.5
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in Sigstore Rekor 0.3.0 through 1.5.1 allows remote attackers to crash the server via a crafted Alpine APK. Package.Unmarshal() in pkg/types/alpine/apk.go expands APK signature and control gzip members into memory before enforcing per-entry size limits, allowing a small compressed request to exhaust the heap. The unauthenticated create and retrieve API endpoints reach this path, and the resulting Go runtime OOM or OS OOM-kill terminates service.

The record

CVE
CVE-2026-48702
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Sigstore
Product
Rekor
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.3.0, < 1.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sigstore · Rekorversion=>= 0.3.0, < 1.5.2

Published CVSS scores

7.5SigstoreCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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