---
id: CVE-2026-48791
title: >-
  sigstore-java is a sigstore java client for interacting with sigstore
  infrastructure
summary: >-
  sigstore-java is a sigstore java client for interacting with sigstore
  infrastructure. Version 2.0.0 erroneously removed verification of the
  integrated (Rekor entry) time) against the Fulcio certificate. Version 2.1.0
  re-added this verifi…
severity: low
cvss: 2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-347
vendor: sigstore
product: 'dev.sigstore:sigstore-java'
affected:
  - 'dev.sigstore:sigstore-java = 2.0.0'
patched:
  - 'dev.sigstore:sigstore-java 2.1.0'
published: '2026-08-13'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:02:22.660'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48791'
references:
  - url: >-
      https://github.com/sigstore/sigstore-java/commit/4b7a49ebb1813f5b1ff113bcad63246358222d61
    label: security-advisories@github.com
  - url: >-
      https://github.com/sigstore/sigstore-java/commit/b529335728fc5cfb574161b4b3c06859a8a2aa88
    label: security-advisories@github.com
  - url: 'https://github.com/sigstore/sigstore-java/pull/1008'
    label: security-advisories@github.com
  - url: 'https://github.com/sigstore/sigstore-java/pull/1185'
    label: security-advisories@github.com
  - url: >-
      https://github.com/sigstore/sigstore-java/security/advisories/GHSA-qqw8-7c2r-jxch
    label: security-advisories@github.com
  - url: >-
      https://github.com/sigstore/sigstore-java/security/advisories/GHSA-qqw8-7c2r-jxch
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-qqw8-7c2r-jxch'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00071
epssPercentile: 0.00041
ecosystem: maven
ingestedAt: '2026-06-30T21:24:14.418Z'
---

## Overview

sigstore-java is a sigstore java client for interacting with sigstore infrastructure. Version 2.0.0 erroneously removed verification of the integrated (Rekor entry) time) against the Fulcio certificate. Version 2.1.0 re-added this verification with enhancements that adhere to the Sigstore verification spec. The old sigstore-conformance test for this check was built incorrectly. 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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-48791)

Affected packages:

- `dev.sigstore:sigstore-java = 2.0.0`

Patched in:

- `dev.sigstore:sigstore-java 2.1.0`

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