Out-of-Bounds Write Vulnerability in warmcat libwebsockets Product
CVE-2026-78161

6.9MEDIUM

Key Information:

Vendor

Warmcat

Status
Libwebsockets
Vendor
CVE Published:
24 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-78161?

A vulnerability exists in warmcat libwebsockets 4.5.0 within the report_raw_cbor function located in lib/misc/lecp.c, leading to the possibility of an out-of-bounds write. This issue allows for remote exploitation, which could potentially compromise the integrity and security of systems using this library. It is essential to apply the patch identified as 1d44554a1bb262db63ff4e240152a9deecd99054 to mitigate this risk effectively.

Affected Version(s)

libwebsockets 4.5.0

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-2026-78161 - Proof of Concept

CVE-2026-78161 - Proof of Concept

References

https://vuldb.com/vuln/394543
vdb-entrytechnical-description
https://vuldb.com/vuln/394543/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-78161
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
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

biniam (VulDB User)
.