CVE-2026-13588Public exploitNetwork attack vector

Remote heap over-read via truncated ClientHello

Published Jun 29, 2026 · Updated Jun 29, 2026

Heap-based buffer overflow in PcapPlusPlus 25.05 allows remote attackers to read two bytes past a heap buffer via a malformed TLS ClientHello. SSLClientHelloMessage::getHandshakeVersion reads the two-byte handshakeVersion field without first verifying that the packet extends beyond the TLS handshake header. A consuming application must parse attacker-controlled TLS traffic; the demonstrated consequence is a heap over-read and an AddressSanitizer process abort.

CVSS severityUnavailable
Unscored
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in PcapPlusPlus 25.05 allows remote attackers to read two bytes past a heap buffer via a malformed TLS ClientHello. SSLClientHelloMessage::getHandshakeVersion reads the two-byte handshakeVersion field without first verifying that the packet extends beyond the TLS handshake header. A consuming application must parse attacker-controlled TLS traffic; the demonstrated consequence is a heap over-read and an AddressSanitizer process abort.

The record

CVE
CVE-2026-13588
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
seladb
Product
PcapPlusPlus
Classifications
CWE-119, CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=25.05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

seladb · PcapPlusPlusversion=25.05

Published CVSS scores

6.3VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.1VulDBAV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C
5.6VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
5.6VulDBCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-122Heap-based Buffer Overflow

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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