CVE-2026-15813

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-20. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

A vulnerability was found in the network packet de-fragmentation engine of kronosnet (Version affected <= 1.34). The internal reassembly code does not properly validate sequence numbers of incoming payload fragments. An attacker can exploit this lack of verification by transmitting malformed packets with corrupted sequence parameters. Under specific conditions, this forces the packet processing layer to parse data outside the designated bounds of the internal memory structures, causing an out-of-bounds memory access or heap corruption. This behavior can result in sudden application crashes or system instability.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

July 20, 2026

Last Modified

August 21, 2026

Advisory Details (2)

Auto-updated Jul 20, 2026
Patch available. Sources: redhat.
redhat

2500854 – (CVE-2026-15813) CVE-2026-15813 kronosnet: kronosnet: memory corruption and out-of-bounds access via malformed network packet defragmentation

https://bugzilla.redhat.com/show_bug.cgi?id=2500854
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-15813

Vendor Advisories for CVE-2026-15813(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
kronosnet1.20-4 ... 1.33-1 (18 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
kronosnet1.25-1 ... 1.33-1 (11 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
kronosnet1.31-1, 1.32-1, 1.33-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
kronosnet1.31-1, 1.32-1, 1.33-1——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 83× 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 111 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-15813?
CVE-2026-15813 is a medium vulnerability published on July 20, 2026. A vulnerability was found in the network packet de-fragmentation engine of kronosnet (Version affected <= 1.34). The internal reassembly code does not properly validate sequence numbers of incoming payload fragments. An attacker can exploit this lack of verification by transmitting malformed…
When was CVE-2026-15813 disclosed?
CVE-2026-15813 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15813 actively exploited?
CVE-2026-15813 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 71.3% of all scored CVEs.
What is the CVSS score of CVE-2026-15813?
CVE-2026-15813 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-15813?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15813, 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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