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Vulnerability · Published Apr 23, 2026 · Assigned by VulDB

CVE-2026-6878ByteDance verl grader.py math_equal sandbox

Medium 5.6

In plain English

A medium-severity security flaw in verl from ByteDance. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).

Severity (CVSS 3.1)5.6Medium
Exploit odds (30 days)0.3%top 73.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIverlno fix listedGHSA-h57c-v2v3-5v3v
PyPIverlno fix listedPYSEC-2026-3402

Affected products (as reported)

VendorProductVersions
ByteDance verl 0.10.20.30.40.50.60.7.0

Weakness: CWE-265, CWE-264 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References