CVE-2026-40518General(bytedance / deerflow)

LOWCVSS 9.1 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

ByteDance DeerFlow before commit 2176b2b contains a path traversal and arbitrary file write vulnerability in bootstrap-mode custom-agent creation where the agent name validation is bypassed. Attackers can supply traversal-style values or absolute paths as the agent name to influence directory creation and write files outside the intended custom-agent directory, potentially achieving arbitrary file write on the system subject to filesystem permissions.

0.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-22

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • deerflow

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • General: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-04-17); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
Products
deerflow

1 version affected across 1 product

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-04-17: 1Mentions · 2026-04-19: 1Technical Details · 2026-04-17: 1Technical Details · 2026-04-19: 104-1704-19
Signal classification1 categories
General
2100.0%
Referenced assets3 URLs
Full discourse2 posts
  • CVE@CVEnew
    General

    CVE-2026-40518 ByteDance DeerFlow before commit 2176b2b contains a path traversal and arbitrary file write vulnerability in bootstrap-mode custom-agent creation where the agent name… https://www.cve.org/CVERecord?id=CVE-2026-40518

    Post summary

    A tweet notes CVE‑2026‑40518, a path traversal / arbitrary file write bug in ByteDance DeerFlow before commit 2176b2b, but offers no additional context on exploitation, PoC, or remediation.

    00000115
    57.2K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    General

    CVE-2026-40518 Path Traversal and Arbitrary File Write in ByteDance Deer... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-40518 Don't wait vulnerability scanning results: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=2

    Post summary

    The tweet announces CVE-2026-40518, links to its details, and notes it involves path traversal and arbitrary file write, but gives no further technical depth, exploit, patch, or activity information.

    0000047
    4.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appbytedancedeerflow2.0-m0--

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