CVE-2026-6878— ByteDance verl grader.py math_equal sandbox
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I. Basic Information for CVE-2026-6878
Vulnerability Information
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Vulnerability Title
ByteDance verl grader.py math_equal sandbox
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability was identified in ByteDance verl up to 0.7.0. Affected is the function math_equal of the file prime_math/grader.py. The manipulation leads to sandbox issue. It is possible to initiate the attack remotely. The complexity of an attack is rather high. The exploitability is told to be difficult. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
权限/沙箱问题
Source: NVD (National Vulnerability Database)
Vulnerability Title
VeRL 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
VeRL是ByteDance开源的一个面向大模型训练与推理优化的强化学习框架。 VeRL 0.7.0及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于prime_math/grader.py文件中math_equal函数存在沙箱问题，可能导致远程攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-6878
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- Submit #795257: Bytedance verl <=0.7.0 Arbitrary Code Executionthird-party-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-6878
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