CVE-2026-13589 seladb PcapPlusPlus Telnet Subnegotiation Packet TelnetLayer.cpp getSubCommand heap-based overflow
A heap-based buffer overflow in PcapPlusPlus allows remote attackers to execute arbitrary code or cause denial of service via crafted Telnet packets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-13589?
CVE-2026-13589 is a medium-severity memory corruption vulnerability in seladb PcapPlusPlus, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was identified in seladb PcapPlusPlus 25.05. This affects the function pcpp::TelnetLayer::getSubCommand of the file Packet++/src/TelnetLayer.cpp of the component Telnet Subnegotiation Packet Handler. The manipulation leads to heap-based buffer overflow. The attack can be initiated remotely. The complexity of an attack is rather high. The exploitability is reported as difficult. The exploit is publicly available and might be used. The identifier of the patch is 98e671010bc7c87b95898c22ae289220ae92542b. It is recommended to apply a patch to fix this issue.
Which versions are affected by CVE-2026-13589?
How do I fix CVE-2026-13589?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-13589 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13589 exists.
Sources
Also known as GHSA-x5wv-5f96-x49c.