PT-2026-34591 · Bytedance · Verl

Zast.Ai · Published 2026-04-23 · Updated 2026-04-23 · CVE-2026-6878

Positive Technologies (AI Summary)

CVSS v3.1

5.6

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Name of the Vulnerable Software and Affected Versions ByteDance verl versions prior to 0.7.1

Description A sandbox issue exists in the math equal() function within the prime math/grader.py file. This flaw allows for remote attacks, although the complexity is high and exploitability is considered difficult.

Recommendations Update to a version newer than 0.7.0. As a temporary workaround, consider restricting the use of the math equal() function in the prime math/grader.py file.

Exploit

Fix

Eval Injection

Weakness Enumeration

CWE-95

CWE-264

CWE-265

Related Identifiers

CVE-2026-6878

GHSA-H57C-V2V3-5V3V

Affected Products

Verl

References · 9

• 🔥 https://github.com/zast-ai/vulnerability-reports/blob/main/bytedance/verl_rce.md · Exploit
• https://osv.dev/vulnerability/GHSA-h57c-v2v3-5v3v · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6878 · Security Note
• https://github.com/verl-project/verl · Note
• https://github.com/verl-project/verl/blob/v0.7.1/verl/utils/reward_score/prime_math/grader.py · Note
• https://vuldb.com/vuln/359040/cti · Note
• https://twitter.com/CVEnew/status/2047359911621755120 · Twitter Post
• https://vuldb.com/submit/795257 · Note
• https://vuldb.com/vuln/359040 · Note