CVE-2026-13588

MEDIUMPre-NVD 5.65.6—
EchelonGraph scoreHIGH confidence

Score 5.6 from GitHub Security Advisory (severity: LOW) published 2026-06-29. a secondary CVSS source baseline 5.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.6Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability was determined in seladb PcapPlusPlus 25.05. The impacted element is the function pcpp::SSLClientHelloMessage::getHandshakeVersion of the file Packet++/src/SSLHandshake.cpp of the component TLS Hello Handler. Executing a manipulation of the argument handshakeVersion can lead to heap-based buffer overflow. It is possible to launch the attack remotely. This attack is characterized by high complexity. The exploitability is regarded as difficult. The exploit has been publicly disclosed and may be utilized. This patch is called 98e671010bc7c87b95898c22ae289220ae92542b. It is best practice to apply a patch to resolve this issue.

CVSS v3
5.6
EG Score
5.6(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity56% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

June 29, 2026

Last Modified

June 29, 2026

Advisory Details (4)

Auto-updated Jun 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

GitHub - seladb/PcapPlusPlus: PcapPlusPlus is a multiplatform C++ library for capturing, parsing and crafting of network packets. It is designed to be efficient, powerful and easy to use. It provides C++ wrappers for the most popular packet processing engines such as libpcap, Npcap, WinPcap, DPDK, AF_XDP and PF_RING. · GitHub

https://github.com/seladb/PcapPlusPlus/
github_commit

commit 98e671010bc7 (seladb/PcapPlusPlus)

Fix landed in seladb/PcapPlusPlus commit 98e671010bc7 — awaiting tagged release

https://github.com/seladb/PcapPlusPlus/commit/98e671010bc7c87b95898c22ae289220ae92542b
github_pr

Fix truncated Telnet and TLS hello reads

Fix merged in seladb/PcapPlusPlus PR #2161 on 2026-06-24 — awaiting tagged release

https://github.com/seladb/PcapPlusPlus/pull/2161
generic

Heap-Buffer-Overflow in SSLClientHelloMessage::getHandshakeVersion() · Issue #2151 · seladb/PcapPlusPlus · GitHub

https://github.com/seladb/PcapPlusPlus/issues/2151

Vendor Advisories for CVE-2026-13588(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 63× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-28 15:36 UTCEPSS rescore
  2. 2026-07-28 14:28 UTCEG score recompute
  3. 2026-07-28 14:28 UTCGHSA enrichment
  4. 2026-07-27 14:13 UTCEPSS rescore
  5. 2026-07-27 12:29 UTCEG score recompute
  6. 2026-07-27 12:29 UTCGHSA enrichment
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-26 14:14 UTCEG score recompute
  10. 2026-07-26 14:14 UTCGHSA enrichment
  11. 2026-07-25 14:17 UTCEPSS rescore
  12. 2026-07-24 14:17 UTCEPSS rescore
  13. 2026-07-23 14:18 UTCEPSS rescore
  14. 2026-07-23 03:05 UTCEG score recompute
  15. 2026-07-22 14:08 UTCEPSS rescore
  16. 2026-07-21 15:24 UTCEPSS rescore
  17. 2026-07-20 17:08 UTCEPSS rescore
  18. 2026-07-19 14:30 UTCEPSS rescore
  19. 2026-07-19 02:28 UTCEPSS rescore
  20. 2026-07-18 10:04 UTCEPSS rescore
  21. 2026-07-17 05:55 UTCGHSA enrichment
  22. 2026-07-16 17:02 UTCEPSS rescore
  23. 2026-07-16 07:48 UTCGHSA enrichment
  24. 2026-07-15 16:57 UTCEPSS rescore
  25. 2026-07-15 09:40 UTCGHSA enrichment
Show 38 more
  1. 2026-07-15 02:00 UTCEPSS rescore
  2. 2026-07-14 11:33 UTCGHSA enrichment
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-13 13:26 UTCGHSA enrichment
  5. 2026-07-13 06:12 UTCEPSS rescore
  6. 2026-07-12 15:19 UTCGHSA enrichment
  7. 2026-07-12 05:46 UTCEPSS rescore
  8. 2026-07-11 17:10 UTCGHSA enrichment
  9. 2026-07-11 08:27 UTCEPSS rescore
  10. 2026-07-10 19:03 UTCGHSA enrichment
  11. 2026-07-09 20:55 UTCGHSA enrichment
  12. 2026-07-09 19:10 UTCEPSS rescore
  13. 2026-07-08 22:48 UTCGHSA enrichment
  14. 2026-07-08 15:15 UTCEPSS rescore
  15. 2026-07-08 15:15 UTCEPSS rescore
  16. 2026-07-08 00:41 UTCGHSA enrichment
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-07 02:35 UTCGHSA enrichment
  19. 2026-07-06 16:27 UTCEPSS rescore
  20. 2026-07-06 04:27 UTCGHSA enrichment
  21. 2026-07-06 02:23 UTCEPSS rescore
  22. 2026-07-05 06:08 UTCGHSA enrichment
  23. 2026-07-05 02:30 UTCEPSS rescore
  24. 2026-07-05 02:30 UTCEPSS rescore
  25. 2026-07-04 07:57 UTCGHSA enrichment
  26. 2026-07-04 06:31 UTCEPSS rescore
  27. 2026-07-03 09:48 UTCGHSA enrichment
  28. 2026-07-02 11:41 UTCGHSA enrichment
  29. 2026-07-01 15:06 UTCEPSS rescore
  30. 2026-07-01 15:06 UTCEPSS rescore
  31. 2026-07-01 13:33 UTCGHSA enrichment
  32. 2026-06-30 23:22 UTCEPSS rescore
  33. 2026-06-30 15:26 UTCGHSA enrichment
  34. 2026-06-29 19:26 UTCNVD updateCVSS v4 → 2.9
  35. 2026-06-29 18:03 UTCMITRE cvelistV5CVSS v4 → 6.3
  36. 2026-06-29 17:26 UTCNVD updateCVSS v4 → 2.9
  37. 2026-06-29 17:19 UTCEG score recompute
  38. 2026-06-29 17:17 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-13588?
CVE-2026-13588 is a medium vulnerability published on June 29, 2026. A vulnerability was determined in seladb PcapPlusPlus 25.05. The impacted element is the function pcpp::SSLClientHelloMessage::getHandshakeVersion of the file Packet++/src/SSLHandshake.cpp of the component TLS Hello Handler. Executing a manipulation of the argument handshakeVersion can lead to…
When was CVE-2026-13588 disclosed?
CVE-2026-13588 was first published in the National Vulnerability Database on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13588 actively exploited?
CVE-2026-13588 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.4% of all scored CVEs.
What is the CVSS score of CVE-2026-13588?
CVE-2026-13588 has a CVSS v3 base score of 5.6 (NVD).
How do I remediate CVE-2026-13588?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13588, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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