CVE-2026-13589

MEDIUMPre-NVD 5.65.6—
EchelonGraph scoreMEDIUM 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: 1%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 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.

CVSS v3
5.6
EG Score
5.6(medium)
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
1%
EPSS %ILE
46%
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 TelnetLayer::getSubCommand() · Issue #2152 · seladb/PcapPlusPlus · GitHub

https://github.com/seladb/PcapPlusPlus/issues/2152

Vendor Advisories for CVE-2026-13589(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 8× in last 7d / 54× 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.

Showing the most recent 100 of 159 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
  4. 2026-09-08 22:00 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 14:42 UTCEG score recompute
  7. 2026-09-06 14:42 UTCGHSA enrichment
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-04 05:06 UTCEPSS rescore
  10. 2026-09-02 14:11 UTCEPSS rescore
  11. 2026-09-01 13:53 UTCEPSS rescore
  12. 2026-09-01 04:39 UTCEPSS rescore
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 18:37 UTCEG score recompute
  15. 2026-08-30 18:37 UTCGHSA enrichment
  16. 2026-08-30 01:21 UTCEPSS rescore
  17. 2026-08-28 21:40 UTCEPSS rescore
  18. 2026-08-27 22:47 UTCEG score recompute
  19. 2026-08-27 22:47 UTCGHSA enrichment
  20. 2026-08-27 14:24 UTCEPSS rescore
  21. 2026-08-25 13:48 UTCEPSS rescore
  22. 2026-08-25 05:26 UTCEG score recompute
  23. 2026-08-25 05:26 UTCGHSA enrichment
  24. 2026-08-24 06:43 UTCGHSA enrichment
  25. 2026-08-23 07:39 UTCEG score recompute
Show 75 more
  1. 2026-08-23 07:39 UTCGHSA enrichment
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-22 08:53 UTCEG score recompute
  4. 2026-08-22 08:53 UTCGHSA enrichment
  5. 2026-08-21 23:48 UTCEPSS rescore
  6. 2026-08-21 04:52 UTCEG score recompute
  7. 2026-08-21 04:52 UTCGHSA enrichment
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-20 05:46 UTCEG score recompute
  10. 2026-08-20 05:46 UTCGHSA enrichment
  11. 2026-08-19 17:03 UTCEPSS rescore
  12. 2026-08-18 23:10 UTCEG score recompute
  13. 2026-08-18 23:10 UTCGHSA enrichment
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-17 15:25 UTCEG score recompute
  16. 2026-08-17 15:25 UTCGHSA enrichment
  17. 2026-08-16 16:42 UTCEG score recompute
  18. 2026-08-16 16:42 UTCGHSA enrichment
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 17:55 UTCEG score recompute
  22. 2026-08-15 17:55 UTCGHSA enrichment
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 19:13 UTCEG score recompute
  25. 2026-08-14 19:13 UTCGHSA enrichment
  26. 2026-08-13 22:00 UTCEPSS rescore
  27. 2026-08-13 20:30 UTCGHSA enrichment
  28. 2026-08-12 21:44 UTCEG score recompute
  29. 2026-08-12 21:44 UTCGHSA enrichment
  30. 2026-08-12 13:50 UTCEPSS rescore
  31. 2026-08-11 23:02 UTCEG score recompute
  32. 2026-08-11 23:02 UTCGHSA enrichment
  33. 2026-08-11 13:42 UTCEPSS rescore
  34. 2026-08-11 00:21 UTCEG score recompute
  35. 2026-08-11 00:21 UTCGHSA enrichment
  36. 2026-08-10 23:59 UTCEPSS rescore
  37. 2026-08-10 01:38 UTCEG score recompute
  38. 2026-08-10 01:38 UTCGHSA enrichment
  39. 2026-08-09 13:46 UTCEPSS rescore
  40. 2026-08-09 02:56 UTCEG score recompute
  41. 2026-08-09 02:56 UTCGHSA enrichment
  42. 2026-08-08 16:37 UTCEPSS rescore
  43. 2026-08-08 04:14 UTCEG score recompute
  44. 2026-08-08 04:14 UTCGHSA enrichment
  45. 2026-08-07 05:32 UTCEG score recompute
  46. 2026-08-07 05:32 UTCGHSA enrichment
  47. 2026-08-06 13:46 UTCEPSS rescore
  48. 2026-08-06 06:50 UTCEG score recompute
  49. 2026-08-06 06:50 UTCGHSA enrichment
  50. 2026-08-05 19:17 UTCEPSS rescore
  51. 2026-08-05 08:08 UTCEG score recompute
  52. 2026-08-05 08:08 UTCGHSA enrichment
  53. 2026-08-04 15:09 UTCEPSS rescore
  54. 2026-08-04 10:38 UTCEPSS rescore
  55. 2026-08-04 08:48 UTCEG score recompute
  56. 2026-08-04 08:48 UTCGHSA enrichment
  57. 2026-08-03 10:35 UTCEPSS rescore
  58. 2026-08-03 07:46 UTCGHSA enrichment
  59. 2026-08-02 08:51 UTCEG score recompute
  60. 2026-08-02 08:51 UTCGHSA enrichment
  61. 2026-08-02 02:26 UTCEPSS rescore
  62. 2026-08-01 10:08 UTCEG score recompute
  63. 2026-08-01 10:08 UTCGHSA enrichment
  64. 2026-08-01 04:15 UTCEPSS rescore
  65. 2026-07-31 11:21 UTCEG score recompute
  66. 2026-07-31 11:21 UTCGHSA enrichment
  67. 2026-07-30 16:27 UTCEPSS rescore
  68. 2026-07-30 12:21 UTCEG score recompute
  69. 2026-07-30 12:21 UTCGHSA enrichment
  70. 2026-07-30 01:30 UTCEPSS rescore
  71. 2026-07-29 13:10 UTCEG score recompute
  72. 2026-07-29 13:10 UTCGHSA enrichment
  73. 2026-07-28 15:36 UTCEPSS rescore
  74. 2026-07-28 14:28 UTCEG score recompute
  75. 2026-07-28 14:28 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13589?
CVE-2026-13589 is a medium vulnerability published on June 29, 2026. 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…
When was CVE-2026-13589 disclosed?
CVE-2026-13589 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-2026-13589 actively exploited?
CVE-2026-13589 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.9% of all scored CVEs.
What is the CVSS score of CVE-2026-13589?
CVE-2026-13589 has a CVSS v3 base score of 5.6 (NVD).
How do I remediate CVE-2026-13589?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13589, 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.

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