CVE-2026-58216

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

Score 5.3 from GitHub Security Advisory published 2026-07-30. A secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-51177 (ENISA EUVD) · GHSA-vc9h-gm8g-6j4x (GitHub Security Advisories)Source: ENISA EUVD

5.3EG
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: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of the allocated buffer. While this out-of-bounds read typically results in a harmless decryption failure, if the read hits unmapped memory, it causes the KDC process to crash. An authenticated attacker can send a specially crafted kpasswd request containing malformed ASN.1 data to trigger the out-of-bounds read, which may cause the KDC process to terminate, resulting in a denial of service.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity53% × 45%
Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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
0.5%
EPSS %ILE
40th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.

EG Severity
5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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.

The score's inputs: 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 30, 2026

Last Modified

July 31, 2026

Advisory Details (4)

Auto-updated Jul 30, 2026
Patch available. Sources: redhat.
Web page

Samba - Security Announcement Archive

https://www.samba.org/samba/security/CVE-2026-58216.html
Web page

16087 – (CVE-2026-58216) [SECURITY] CVE-2026-58216: kpasswd service: 6-byte heap OOB read in packet parser

https://bugzilla.samba.org/show_bug.cgi?id=16087
Red Hat

2502721 – (CVE-2026-58216) CVE-2026-58216 samba: kpasswd service: kpasswd packet that contains malformed ASN.1 might cause the server to access 6 bytes of unallocated memory leading server to crash

https://bugzilla.redhat.com/show_bug.cgi?id=2502721
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-58216

Vendor Advisories for CVE-2026-58216(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwinbind (2:4.19.5+dfsg-4ubuntu9.7) @ noble2026-10-22ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.13.13+dfsg-1 ... 2:4.24.5+dfsg-1~bpo13+1 (245 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.17.10+dfsg-0+deb12u1 ... 2:4.25.0~rc1+dfsg-1 (178 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.22.10+dfsg-0+deb13u1 ... 2:4.22.8+dfsg-0+deb13u2 (9 versions)
  • every version up to 2:4.22.10+dfsg-0+deb13u2: fixed in 2:4.22.10+dfsg-0+deb13u2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.22.3+dfsg-4 ... 2:4.24.5+dfsg-1~bpo13+1 (34 versions)
  • every version up to 2:4.24.5+dfsg-1: fixed in 2:4.24.5+dfsg-1
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 47× 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 266 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 166 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  6. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  7. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-10-25 14:16 UTCEG score recompute
  9. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  10. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-22 21:01 UTCEG score recompute
  12. 2026-10-22 21:01 UTCVendor advisory
  13. 2026-10-22 21:01 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  14. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  17. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  18. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  19. 2026-10-18 03:28 UTCEG score recompute
  20. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  21. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  22. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  23. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  25. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
Show 75 more
  1. 2026-10-12 15:53 UTCEG score recompute
  2. 2026-10-11 19:36 UTCEG score recompute
  3. 2026-10-11 16:52 UTCEG score recompute
  4. 2026-10-11 14:14 UTCEG score recompute
  5. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  6. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  7. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  8. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-10-06 23:52 UTCEG score recompute
  11. 2026-10-06 23:52 UTCVendor advisory
  12. 2026-10-06 23:52 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-10-05 20:01 UTCEG score recompute
  15. 2026-10-05 20:01 UTCVendor advisory
  16. 2026-10-05 20:00 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  19. 2026-10-04 06:38 UTCEG score recompute
  20. 2026-10-04 06:38 UTCVendor advisory
  21. 2026-10-04 06:38 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  22. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  23. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  24. 2026-10-02 16:57 UTCEG score recompute
  25. 2026-10-02 16:57 UTCVendor advisory
  26. 2026-10-02 16:57 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  27. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  28. 2026-10-01 02:54 UTCEG score recompute
  29. 2026-10-01 02:54 UTCVendor advisory
  30. 2026-10-01 02:54 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  31. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  32. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  33. 2026-09-29 06:53 UTCEG score recompute
  34. 2026-09-29 06:53 UTCVendor advisory
  35. 2026-09-29 06:53 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  36. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  37. 2026-09-27 19:01 UTCEG score recompute
  38. 2026-09-27 19:01 UTCVendor advisory
  39. 2026-09-27 19:01 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  40. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  41. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  42. 2026-09-25 04:56 UTCEG score recompute
  43. 2026-09-25 04:56 UTCVendor advisory
  44. 2026-09-25 04:56 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  45. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  46. 2026-09-23 21:30 UTCEG score recompute
  47. 2026-09-23 21:30 UTCVendor advisory
  48. 2026-09-23 21:30 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  49. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  50. 2026-09-22 15:13 UTCEG score recompute
  51. 2026-09-22 15:13 UTCVendor advisory
  52. 2026-09-22 15:13 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  53. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  54. 2026-09-20 03:41 UTCEG score recompute
  55. 2026-09-20 03:41 UTCVendor advisory
  56. 2026-09-20 03:41 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  57. 2026-09-19 04:16 UTCEG score recompute
  58. 2026-09-19 04:16 UTCVendor advisory
  59. 2026-09-19 04:15 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  60. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  61. 2026-09-18 03:02 UTCEG score recompute
  62. 2026-09-18 03:02 UTCVendor advisory
  63. 2026-09-18 03:02 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  64. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  65. 2026-09-17 04:18 UTCEG score recompute
  66. 2026-09-17 04:18 UTCVendor advisory
  67. 2026-09-17 04:18 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  68. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  69. 2026-09-16 05:35 UTCEG score recompute
  70. 2026-09-16 05:35 UTCVendor advisory
  71. 2026-09-16 05:35 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3
  72. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  73. 2026-09-15 03:18 UTCEG score recompute
  74. 2026-09-15 03:18 UTCVendor advisory
  75. 2026-09-15 03:18 UTCGHSA enrichmentGHSA-vc9h-gm8g-6j4x · GitHub CVSS 5.3

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Frequently asked(5)

What is CVE-2026-58216?
CVE-2026-58216 is a medium-severity vulnerability; its CVE record was published on July 30, 2026. An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of…
When was CVE-2026-58216 made public?
CVE-2026-58216 was made public on July 28, 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 30, 2026. EchelonGraph's copy of the record carries a last-modified date of July 31, 2026; the record at its source may have been updated since.
Is CVE-2026-58216 actively exploited?
CVE-2026-58216 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58216?
CVE-2026-58216 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-58216?
A fix for CVE-2026-58216 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-58216 are linked in the Vendor Advisories panel on this page.

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