What is CVE-2026-48816?

CVE-2026-48816 is a medium-severity vulnerability in Sigstore Sigstore-Js, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2026-07-14.

How severe is CVE-2026-48816?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Sigstore Sigstore-Js

CVE-2026-48816

sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.1.1, @sigstore/verify derives a transparency-log timestamp from tlogEntries[].integratedTime for bundle v0.2 inclusionProof-only entries even though the inclusion proof path does not cryptographically bind integratedTime, allowing an attacker who can supply an untrusted bundle to influence certificate validity and timestampThreshold verification decisions. This issue is fixed in version 3.1.1.

EPSS: 0.002 (5.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Sigstore Sigstore-js — versions < 3.1.1

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-48816?: CVE-2026-48816 is a medium-severity vulnerability in Sigstore Sigstore-Js, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2026-07-14.
How severe is CVE-2026-48816?: Medium severity. CVSS v3 base score is 6.5 out of 10.