reason-jose ignores signature checks
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347.
Summary
reason-jose is a JOSE implementation in ReasonML and OCaml.`Jose.Jws.validate` does not check HS256 signatures. This allows tampering of JWS header and payload data if the service does not perform additional checks. Such tampering could expose applications using reason-jose to authorization bypass. Applications relying on JWS claims assertion to enforce security boundaries may be vulnerable to privilege escalation. This issue has been patched in version 0.8.2.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- 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 |
|---|---|---|---|---|---|
| ulrikstrid | reason-jose | before 0.8.2 | 0.8.2 | Patch available | CNA |
- reason-jose Vendorulrikstrid Affected before 0.8.2 Fixed in 0.8.2 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:reason-jose_project:reason-jose:*:*:*:*:*:*:*:* | before 0.8.2 | Vulnerable | Reason-jose Project |
- cpe:2.3:a:reason-jose_project:reason-jose:*:*:*:*:*:*:*:* Versions before 0.8.2 Vulnerable ·Reason-jose Project
Remediation
- Fix · CNA reason-jose (ulrikstrid) Fixed in 0.8.2
Timeline
- 2026-10-02 Threatist record created from CVE-2023-23928
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences