CVE-2026-48816Public exploitNetwork attack vectorHinoki check available

Artifact trust bypass via unbound log timestamp

Published Jul 14, 2026 · Updated Jul 14, 2026

Improper timestamp verification in Sigstore sigstore-js before 3.1.1 allows attackers to influence trust decisions via a crafted bundle. The @sigstore/verify bundle path treats tlogEntries[].integratedTime as trusted for v0.2 inclusionProof-only entries although the proof does not bind that value. Reachability requires an application to accept an untrusted bundle and rely on transparency-log time for certificate validity or timestampThreshold checks.

CVSS severity6.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper timestamp verification in Sigstore sigstore-js before 3.1.1 allows attackers to influence trust decisions via a crafted bundle. The @sigstore/verify bundle path treats tlogEntries[].integratedTime as trusted for v0.2 inclusionProof-only entries although the proof does not bind that value. Reachability requires an application to accept an untrusted bundle and rely on transparency-log time for certificate validity or timestampThreshold checks.

The record

CVE
CVE-2026-48816
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Sigstore
Product
sigstore-js
Classifications
CWE-345, T1553.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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=< 3.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sigstore · sigstore-jsversion=< 3.1.1

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1553.002Subvert Trust Controls: Code Signing

Public exploit references

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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