id: PYSEC-2026-3402
published: "2026-07-13T15:02:52.839365Z"
modified: "2026-07-13T16:07:25.523021Z"
aliases:
- CVE-2026-6878
- GHSA-h57c-v2v3-5v3v
summary: verl's math_equal() Vulnerable to Arbitrary Code Execution via Unsafe eval()
details: A vulnerability was identified in ByteDance verl up to 0.7.1. Affected is the function math_equal of the file prime_math/grader.py. The manipulation leads to a 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 may be used. The vendor was contacted early about this disclosure but did not respond in any way.
affected:
- package:
    name: verl
    ecosystem: PyPI
    purl: pkg:pypi/verl
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - last_affected: 0.7.1
  versions:
  - "0.1"
  - 0.1rc0
  - 0.1rc2
  - "0.2"
  - 0.2.0.post1
  - 0.2.0.post2
  - 0.3.0.post0
  - 0.3.0.post1
  - 0.4.0
  - 0.4.1
  - 0.5.0
  - 0.6.0
  - 0.6.1
  - 0.7.0
  - 0.7.1
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-6878
- type: PACKAGE
  url: https://github.com/verl-project/verl
- type: WEB
  url: https://github.com/verl-project/verl/blob/v0.7.1/verl/utils/reward_score/prime_math/grader.py
- type: WEB
  url: https://github.com/zast-ai/vulnerability-reports/blob/main/bytedance/verl_rce.md
- type: WEB
  url: https://vuldb.com/submit/795257
- type: WEB
  url: https://vuldb.com/vuln/359040
- type: WEB
  url: https://vuldb.com/vuln/359040/cti
- type: PACKAGE
  url: https://pypi.org/project/verl
- type: ADVISORY
  url: https://github.com/advisories/GHSA-h57c-v2v3-5v3v
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- type: CVSS_V4
  score: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P