Sandbox Vulnerability in ByteDance Product Versions
CVE-2026-6878

6.3MEDIUM

Key Information:

Vendor

Bytedance

Status
Verl
Vendor
CVE Published:
23 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6878?

A vulnerability exists in the ByteDance verl product versions up to 0.7.0, specifically within the 'math_equal' function located in 'prime_math/grader.py'. This flaw allows for a potential sandbox escape, which could be exploited remotely. Although the complexity of executing an attack is relatively high, the availability of an exploit in public domains raises significant concern. Notably, despite early notification of this vulnerability, the vendor has not provided any response regarding a fix or mitigation.

Affected Version(s)

verl 0.1

verl 0.2

verl 0.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-6878 - Proof of Concept

References

https://vuldb.com/vuln/359040
vdb-entrytechnical-description
https://vuldb.com/vuln/359040/cti
signaturepermissions-required
https://vuldb.com/submit/795257
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ZAST.AI (VulDB User)
VulDB CNA Team
.