joserfc: JWS signature verification bypass via empty signatures array in jws.deserialize_json
CVSS score
9.1
EPSS probability
%0.1
Risk score
0.0
Published
3 d ago
Kanıt listesindeki ürün ve sürüm eşleşmesini kontrol edin; bazı varyantlar hâlâ etkileniyor olabilir.
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
A critical vulnerability exists in the joserfc library where JWS General JSON Serialization inputs with empty signature arrays are accepted as authenticated, leading to a signature verification bypass.
It allows an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic, compromising confidentiality and integrity.
What should be done?
- Follow the vendor advisory for updates
- Upgrade the library to version 1.7.4 or later
- Review General JSON Serialization usage
Chain of evidence and sources
joserfc kütüphanesinin 1.7.4 öncesi sürümleri, boş imza dizisine sahip JWS Genel JSON Serileştirme girdilerini doğrulanmış olarak kabul eder.
verify_general_json döngüsü boş dizi için hiç iterasyon yapmaz ve imza kontrolü başarısız olmadığı için başarı döner.
Show the technical text from the sources
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE: CWE-290, CWE-345, CWE-347
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 9.1 | CVSS V3_1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CVE CNA |
| 9.1 | CVSS V31 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
2 düzeltme kanıtı bulundu; en az 1 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.
1.7.4-1Debian sid: 1.7.4-1
1.7.4-1Debian forky: 1.7.4-1
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-102946 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-102946 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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