CVE-2026-39413 Vulnerability Analysis & Exploit Details

CVE-2026-39413
Vulnerability Scoring

4.2
/10
Medium Risk

The vulnerability CVE-2026-39413 could compromise system integrity but typically requires user interaction to be exploited.

Attack Complexity Details

  • Attack Complexity: High
    Exploits require significant effort and special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: High
    High-level privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: Required
    User interaction is necessary for successful exploitation.

CVE-2026-39413 Details

Status: Modified

Last updated: 🕓 22 Apr 2026, 16:16 UTC
Originally published on: 🕗 08 Apr 2026, 20:16 UTC

Time between publication and last update: 13 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

CVE-2026-39413 Vulnerability Summary

CVE-2026-39413: LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since the jwt.decode() call does not explicitly deny the 'none' algorithm, a crafted token without a signature will be accepted as valid, leading to unauthorized access. This vulnerability is fixed in 1.4.14.

Assessing the Risk of CVE-2026-39413

Access Complexity Graph

The exploitability of CVE-2026-39413 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-39413

The exploitability of CVE-2026-39413 is influenced by multiple factors. Security teams should analyze system configurations and apply appropriate countermeasures to mitigate threats.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-39413, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-39413, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-39413 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: None
    CVE-2026-39413 poses no threat to data integrity.
  • Availability: None
    CVE-2026-39413 does not impact system availability.

CVE-2026-39413 References

External References

CWE Common Weakness Enumeration

CWE-347

CAPEC Common Attack Pattern Enumeration and Classification

  • Padding Oracle Crypto Attack CAPEC-463 An adversary is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an adversary is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an adversary is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key.
  • Signature Spoofing by Improper Validation CAPEC-475 An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.

Vulnerable Configurations

  • cpe:2.3:a:hkuds:lightrag:1.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.0.5:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.0.6:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.0.6:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.0.7:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.0.8:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.0.8:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.0.9:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.0.9:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.3:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.4:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.5:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.6:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.6:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.7:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.7:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.8:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.8:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.9:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.9:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.10:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.10:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.11:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.11:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.1.12:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.1.12:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.2.3:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.2.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.2.4:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.2.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.2.5:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.2.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.2.6:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.2.6:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.2.7:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.2.7:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.2.8:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.2.8:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.2.9:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.2.9:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.1:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.2:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.3:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.4:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.5:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.6:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.6:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.7:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.7:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.8:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.8:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.9:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.9:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.3.10:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.3.10:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.4:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.5:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.6:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.6:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.7:-:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.7:-:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.7:rc2:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.7:rc2:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.8:-:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.8:-:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.8.2:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.8:rc1:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.8:rc1:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.8:rc3:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.8:rc3:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.8:rc4:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.8:rc4:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.8:rc5:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.8:rc5:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.8:rc8:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.8:rc8:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.8:rc9:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.8:rc9:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9:-:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9:-:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.1:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.2:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.3:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.4:-:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.4:-:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.4:rc1:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.4:rc1:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.5:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.6:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.6:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.7:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.7:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.8:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.8:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.9:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.9:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.10:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.10:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9.11:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9.11:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9:rc1:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9:rc1:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9:rc2:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9:rc2:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9:rc3:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9:rc3:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.9:rc4:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.9:rc4:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.10:*:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.10:*:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.11:-:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.11:-:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.11:rc1:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.11:rc1:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.11:rc2:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.11:rc2:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.12:-:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.12:-:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.12:rc1:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.12:rc1:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.13:-:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.13:-:*:*:*:*:*:*
  • cpe:2.3:a:hkuds:lightrag:1.4.13:rc1:*:*:*:*:*:*
    cpe:2.3:a:hkuds:lightrag:1.4.13:rc1:*:*:*:*:*:*

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