CVE-2026-15813

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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 (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
27th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 20, 2026

Last Modified

August 21, 2026

Advisory Details (2)

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

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
Red HatMentions a patch (unverified)

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 rangeFix by version rangeDependents
kronosnet1.20-4 ... 1.33-1 (18 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
kronosnet1.25-1 ... 1.35-1 (12 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
kronosnet1.31-1, 1.32-1, 1.33-1, 1.35-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
kronosnet1.31-1, 1.32-1, 1.33-1
  • every version up to 1.35-1: fixed in 1.35-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 38× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 180 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 80 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  2. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  3. 2026-10-12 16:31 UTCEG score recompute
  4. 2026-10-11 20:09 UTCEG score recompute
  5. 2026-10-11 17:22 UTCEG score recompute
  6. 2026-10-11 14:55 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  8. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  9. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  10. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  14. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  15. 2026-10-04 14:58 UTCEG score recompute
  16. 2026-10-04 14:58 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  18. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  19. 2026-10-01 07:50 UTCEG score recompute
  20. 2026-10-01 07:50 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  21. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  22. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  24. 2026-09-28 06:27 UTCEG score recompute
  25. 2026-09-28 06:27 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
Show 75 more
  1. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  2. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  3. 2026-09-24 03:31 UTCEG score recompute
  4. 2026-09-24 03:31 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  5. 2026-09-23 01:44 UTCEG score recompute
  6. 2026-09-23 01:44 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  7. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  8. 2026-09-18 04:00 UTCEG score recompute
  9. 2026-09-18 04:00 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  10. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  11. 2026-09-16 12:50 UTCEG score recompute
  12. 2026-09-16 12:50 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  13. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  14. 2026-09-14 08:14 UTCEG score recompute
  15. 2026-09-14 08:14 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  16. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  17. 2026-09-13 09:09 UTCEG score recompute
  18. 2026-09-13 09:09 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  19. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  20. 2026-09-12 10:03 UTCEG score recompute
  21. 2026-09-12 10:03 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  22. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  23. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  24. 2026-09-11 09:33 UTCEG score recompute
  25. 2026-09-11 09:33 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  26. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  27. 2026-09-09 12:13 UTCEG score recompute
  28. 2026-09-09 12:13 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  29. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  30. 2026-09-07 23:01 UTCEG score recompute
  31. 2026-09-07 23:01 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  32. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  33. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  34. 2026-09-06 11:51 UTCEG score recompute
  35. 2026-09-06 11:51 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  36. 2026-09-05 09:39 UTCEG score recompute
  37. 2026-09-05 09:39 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  38. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  39. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  40. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  41. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  42. 2026-08-31 01:47 UTCEG score recompute
  43. 2026-08-31 01:47 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  44. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  45. 2026-08-30 02:42 UTCEG score recompute
  46. 2026-08-30 02:41 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  47. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  48. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  49. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  50. 2026-08-27 11:44 UTCEG score recompute
  51. 2026-08-27 11:44 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  52. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  53. 2026-08-26 08:56 UTCEG score recompute
  54. 2026-08-26 08:56 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  55. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  56. 2026-08-25 09:45 UTCEG score recompute
  57. 2026-08-25 09:45 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  58. 2026-08-24 10:39 UTCEG score recompute
  59. 2026-08-24 10:38 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  60. 2026-08-23 11:32 UTCEG score recompute
  61. 2026-08-23 11:32 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  62. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  63. 2026-08-22 12:27 UTCEG score recompute
  64. 2026-08-22 12:27 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  65. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  66. 2026-08-21 13:21 UTCEG score recompute
  67. 2026-08-21 13:21 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  68. 2026-08-21 12:30 UTCEG score recompute
  69. 2026-08-21 12:30 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  70. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  71. 2026-08-20 22:13 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  72. 2026-08-19 22:54 UTCEG score recompute
  73. 2026-08-19 22:54 UTCGHSA enrichmentGHSA-32vg-vj46-3h6w · GitHub CVSS 6.5
  74. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  75. 2026-08-18 19:37 UTCEG score recompute

Related CVEs(same product + same CWE)

Same product

2 shown

Debian:11:kronosnet

Frequently asked(5)

What is CVE-2026-15813?
CVE-2026-15813 is a medium-severity vulnerability; its CVE record was 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 made public?
CVE-2026-15813 was made public on July 15, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 20, 2026. EchelonGraph's copy of the record carries a last-modified date of August 21, 2026; the record at its source may have been updated since.
Is CVE-2026-15813 actively exploited?
CVE-2026-15813 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15813?
CVE-2026-15813 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15813?
A fix for CVE-2026-15813 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-15813 are linked in the Vendor Advisories panel on this page.

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