Is CVE-2026-13588 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-13588 being exploited in the wild.

How severe is CVE-2026-13588?

Medium severity, with a CVSS score of 5.6, published 29 June 2026.

Is there a fix for CVE-2026-13588?

A patch was published on 2026-06-24: Fix merged into dev branch Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-13588 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-13588?

Check whether you run Seladb PcapPlusPlus at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-13588: seladb PcapPlusPlus heap buffer overflow in TLS Hello Handler

CVE-2026-13588 · Severity: medium · CVSS 5.6 · Published 2026-06-29

PcapPlusPlus, a library used for capturing and analyzing network traffic, contains a memory handling flaw in its TLS (encryption) processing component. An attacker could send specially crafted, truncated network packets to trigger a memory error. This could potentially lead to service instability or unauthorized access to small amounts of memory during packet inspection.

Technologies: Seladb PcapPlusPlus. Vendors: Seladb.

Quick answers

Is CVE-2026-13588 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-13588 being exploited in the wild.
How severe is CVE-2026-13588?: Medium severity, with a CVSS score of 5.6, published 29 June 2026.
Which products and versions are affected?: Seladb PcapPlusPlus 25.05.
Is there a fix for CVE-2026-13588?: A patch was published on 2026-06-24: Fix merged into dev branch Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-13588 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-13588?: Check whether you run Seladb PcapPlusPlus at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow (CWE-122) exists in PcapPlusPlus 25.05 within the TLS Hello Handler component. The vulnerability is located in the `pcpp::SSLClientHelloMessage::getHandshakeVersion` function in `Packet++/src/SSLHandshake.cpp`. The root cause is a failure to validate that the packet data is large enough to contain the full TLS Client Hello header before accessing the `handshakeVersion` field. An attacker can exploit this by sending truncated or malformed TLS packets, leading to an out-of-bounds read/overflow. While the attack can be launched remotely, it is considered high complexity due to the specific packet structures required. A patch has been released in commit 98e671010bc7c87b95898c22ae289220ae92542b.

Affected products

seladb PcapPlusPlus 25.05

Timeline

2026-06-09: disclosed: Issue reported on GitHub
2026-06-24: patched: Fix merged into dev branch
2026-06-29: advisory: CVE published

References

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