CVE-2026-48816
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
A vulnerability in sigstore-js (versions prior to 3.1.1) allows an attacker to manipulate the transparency-log timestamp for inclusionProof-only entries in v0.2 bundles. Since the inclusion proof path does not cryptographically bind the timestamp, an attacker can influence certificate validity and timestamp threshold verification decisions.
Risk Assessment
The organization may be deceived by an untrusted bundle, potentially leading to acceptance of invalid certificates or compromise of signature verification integrity.
Recommendation
Immediately update the @sigstore/verify library to version 3.1.1 or later, which contains the fix for this vulnerability.
Other vulnerabilities in sigstore-js
See all- CVE-2026-59891Critical
In sigstore-js prior to version 0.7.1, getRegistryCredentials() reads credentials from the Docker config file and selects an entry by checking whether any configured auth key contains the target registry string. Because this is a substring match rather than an exact host match, credentials configured for one registry can be selected for and transmitted to a different registry whose hostname has a substring relationship with a configured auth key.
- CVE-2026-48815High
In sigstore-js before version 4.1.1, the documented certificateOIDs option in sigstore.verify() is accepted by the public API but discarded before verification. This means required certificate extension OIDs are never checked, and applications relying on certificateOIDs to restrict which certificates may sign artifacts can accept unauthorized certificates.
- CVE-2026-48758Medium
A vulnerability in sigstore-js (versions prior to 3.2.1) allows mutation of the payload type after signing without invalidating the signature, breaking the type-binding guarantee of DSSE. The preAuthEncoding function uses Node.js ASCII encoding, enabling manipulation of the payloadType field.
Original NVD description (English source)
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.