Memory Allocation Flaw in Sigoden Aichat API Endpoint
CVE-2026-84857

6.9MEDIUM

Key Information:

Vendor

Sigoden

Status
Aichat
Vendor
CVE Published:
2 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-84857?

A significant flaw has been identified in the Sigoden Aichat API Endpoint, specifically within the src/serve.rs component. This vulnerability allows for uncontrolled memory allocation, which can be exploited remotely by attackers. The exploit has been publicly disclosed, posing a risk of a Denial of Service attack. Unfortunately, the vendor was unresponsive to notifications regarding this issue, highlighting the need for urgent attention from users of the affected product.

Affected Version(s)

aichat 0.30.0

aichat 0.30.1

aichat 0.30.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-84857 - Proof of Concept

References

https://vuldb.com/vuln/398132
vdb-entry
https://vuldb.com/vuln/398132/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-84857
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

outlookgp (VulDB User)
VulDB CNA Team
.