GHSA-qqw8-7c2r-jxch

Source

https://github.com/advisories/GHSA-qqw8-7c2r-jxch

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-qqw8-7c2r-jxch/GHSA-qqw8-7c2r-jxch.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-qqw8-7c2r-jxch

Aliases

CVE-2026-48791

Published

2026-06-30T18:10:28Z

Modified

2026-06-30T18:26:42Z

Severity

2.0 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N CVSS Calculator

Summary

Sigstore Java has a vulnerability with bundle verification of integratedTime

Details

Summary

Regression: Verification of integratedTime from Rekor V1 Log Entry against Fuclio Certificate validity was missing

Details

PR #1008 erroneously removed verification of the integrated (Rekor entry) time) against the Fulcio certificate.
PR #1185 re-added this verification with enhancements that adhere to the Sigstore verification spec.
old sigstore-conformance test for this check was built incorrectly

PoC

A new bundle was added to sigstore-conformance to test this: sigstore-java:2.0.0 can be tested against it and shown to be unexpectedly passing Verify this bundle against a.txt

$ git clone git@github.com:sigstore/sigstore-java
$ git checkout v2.0.0
$ ./gradlew :sigstore-cli:build
$ tar -xf sigstore-cli/build/distributions/sigstore-cli-*-SNAPSHOT.tar --strip-components 1
$ ./bin/sigstore-cli verify --bundle=bundle.sigstore.json a.txt
# expect error but none

Impact

This vulnerability impacts only users verifying bundles with dev.sigstore:sigstore-java:2.0.0. Older versions are not affected, it is fixed in dev.sigstore:sigstore-java:2.1.0

A malicious actor may exploit this if they were able to access a users system and exfiltrate the temporary private key used during signing and then reuse an old fulcio certificate later without requiring direct access to the user's credentials.

Users may protect themselves by re-verifying their artifacts using the newest sigstore-java or another current sigstore client. Transparency logs may also be audited for unauthorized signatures for a suspected reused identity.

Database specific

{
    "cwe_ids":  [
        "CWE-347"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-06-30T18:10:28Z",
    "nvd_published_at":  null,
    "severity":  "LOW"
}

References

Affected packages

Maven / dev.sigstore:sigstore-java

Package

Name: dev.sigstore:sigstore-java; View open source insights on deps.dev
Purl: pkg:maven/dev.sigstore/sigstore-java

Affected ranges

Type: ECOSYSTEM
Events: Introduced

2.0.0

Fixed

2.1.0

Affected versions

2.*

2.0.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-qqw8-7c2r-jxch/GHSA-qqw8-7c2r-jxch.json"