Heap-based Buffer Overflow in seladb PcapPlusPlus Telnet Subnegotiation Handler
CVE-2026-13589

6.3MEDIUM

Key Information:

Vendor

Seladb

Status
Pcapplusplus
Vendor
CVE Published:
29 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-13589?

A vulnerability in the seladb PcapPlusPlus library affects the Telnet subnegotiation packet handler. Specifically, the issue lies within the function pcpp::TelnetLayer::getSubCommand in the source file Packet++/src/TelnetLayer.cpp. A remote attacker can exploit this vulnerability through manipulation techniques that lead to a heap-based buffer overflow. Due to the complexity of the attack, successful exploitation may require significant expertise. A publicly available exploit could pose a risk, making it essential for users and administrators to apply the recommended patch (identifier: 98e671010bc7c87b95898c22ae289220ae92542b) to secure their systems.

Affected Version(s)

PcapPlusPlus 25.05

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-2026-13589 - Proof of Concept

References

https://vuldb.com/vuln/374592
vdb-entrytechnical-description
https://vuldb.com/vuln/374592/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-13589
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

TYGLS (VulDB User)
.