Vulnerability in Bytedance Verl
CVE-2026-6878
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (35.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Bytedance Verl — versions 0.1, 0.2, 0.3
Weakness classification (CWE)
References
- vuldb.com/vuln/359040 (technical-description, vdb-entry)
- vuldb.com/vuln/359040/cti (signature, permissions-required)
- vuldb.com/submit/795257 (third-party-advisory)
- github.com/zast-ai/vulnerability-reports/blob/main/bytedance/verl_rce.md (exploit)
Frequently asked questions
- What is CVE-2026-6878?
- CVE-2026-6878 is a medium-severity vulnerability in Bytedance Verl, classified under CWE-264. CVSS score: 5.6/10. Published 2026-04-23.
- How severe is CVE-2026-6878?
- Medium severity. CVSS v3 base score is 5.6 out of 10.