sigstore-js: DSSE payloadType type-binding failure
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · Low
- Fix status
- Partial Red Hat: 7 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-347.
Summary
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2.1, the preAuthEncoding function in @sigstore/core uses Node.js ascii encoding when converting the PAE string to bytes, allowing payloadType to be mutated after signing without invalidating the signature and breaking the type-binding guarantee that DSSE is designed to provide. This issue is fixed in version 3.2.1.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| sigstore | sigstore-js | before 3.2.1 | 3.2.1 | Patch available | CNA |
| — | @sigstore/core (npm) | before 3.2.1 | 3.2.1 | Patch available | GHSA-jfc7-64v2-mr8c |
- sigstore-js Vendorsigstore Affected before 3.2.1 Fixed in 3.2.1 Patch available CNA
- @sigstore/core (npm) Vendor— Affected before 3.2.1 Fixed in 3.2.1 Patch available GHSA-jfc7-64v2-mr8c
Remediation
- Fix · CNA sigstore-js (sigstore) Fixed in 3.2.1
- Fix · GHSA-jfc7-64v2-mr8c @sigstore/core (npm) Fixed in 3.2.1 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Dev Spaces | Affected | No fix yet: Fix deferred |
| Red Hat Satellite 6 | Affected | No fix yet: Fix deferred |
| Self-service automation portal 2 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-48758
- 2026-10-03 Alias added: GHSA-jfc7-64v2-mr8c
References
Other 5
- https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c
- https://github.com/sigstore/sigstore-js/pull/1657
- https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7
- https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1
- https://github.com/sigstore/sigstore-js
More sigstore vulnerabilities
- TI-2022-16356 False positive signature verification in cosign CVSS 3.1CRITICAL 9.8
- TI-2026-36084 sigstore-js: `certificateOIDs` verification constraints are silently dropped and never enforced CVSS 3.1HIGH 7.5
- TI-2024-19670 Cosign vulnerable to machine-wide denial of service via malicious artifacts CVSS 3.1HIGH 7.5
- TI-2026-18290 Fulcio vulnerable to Server-Side Request Forgery (SSRF) via MetaIssuer Regex Bypass CVSS 3.1MEDIUM 5.8
- TI-2026-36085 sigstore-js: Insufficient Verification of Data Authenticity CVSS 3.1MEDIUM 6.5
- TI-2024-19669 Cosign vulnerable to system-wide denial of service via malicious attachments CVSS 3.1MEDIUM 5.9
Sources
- CVE-2026-48758 · CVE Program
- CVE-2026-48758 · NVD
- FIRST EPSS
- GHSA-jfc7-64v2-mr8c · GitHub Advisory Database · CC BY 4.0
- CVE-2026-48758 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences