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CVE-2026-48791: sigstore sigstore-java

CVSS: 2.0v3.1LowDeferred
AliasesUBUNTU-CVE-2026-48791GHSA-qqw8-7c2r-jxch
Published 12-08-2026Last modified 13-08-2026
Open JSON

Vulnerability summary

CVE-2026-48791 is a low (CVSS 2.0) vulnerability in sigstore sigstore-java. EPSS estimates a 0.07% chance of exploitation in the next 30 days, higher than 0% of scored vulnerabilities.

Overall risk
8/100
0100
Minimal · default modelHow is this calculated?
CVSS score
2.0/10
010
Low · v3.1 (CVE.org)
EPSS score
0.07%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-08-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.07%

Chance of exploitation in the next 30 days

Percentile

0%

Versus all other CVEs

30-day change

-0.01 pp

From 0.08% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.07%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Dev.sigstore1 product
  • sigstore-java≥ 2.0.0, < 2.1.0
Sigstore1 product
Ubuntu1 product
  • golang-github-sigstore-sigstoreAll versions (No fix recorded)

3 vendors · 3 products

References

8 links