CVE-2026-58216

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

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, ghsa, secondary
Trending — 4 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: None knownExposed: 0

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
5.3(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity53% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

July 30, 2026

Last Modified

July 31, 2026

Advisory Details (4)

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

Samba - Security Announcement Archive

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

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
redhat

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
redhat Patch Available

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 / EcosystemFixed in / PatchReleasedSource
ubuntuwinbind (2:4.19.5+dfsg-4ubuntu9.7) @ noble2026-08-19ubuntu

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 rangeFixed inDependents
samba2:4.13.13+dfsg-1 ... 2:4.24.5+dfsg-1~bpo13+1 (245 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
samba2:4.17.10+dfsg-0+deb12u1 ... 2:4.24.5+dfsg-1~bpo13+1 (173 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
samba2:4.22.10+dfsg-0+deb13u1 ... 2:4.22.8+dfsg-0+deb13u2 (9 versions)2:4.22.10+dfsg-0+deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
samba2:4.22.3+dfsg-4 ... 2:4.24.5+dfsg-1~bpo13+1 (34 versions)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 28× in last 7d / 85× 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. 2026-08-19 22:28 UTCEG score recompute
  2. 2026-08-19 22:28 UTCVendor advisory
  3. 2026-08-19 22:28 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-18 23:45 UTCEG score recompute
  6. 2026-08-18 23:45 UTCVendor advisory
  7. 2026-08-18 23:45 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 01:01 UTCEG score recompute
  10. 2026-08-18 01:01 UTCVendor advisory
  11. 2026-08-18 01:01 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 01:32 UTCEG score recompute
  14. 2026-08-17 01:32 UTCVendor advisory
  15. 2026-08-17 01:32 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 02:49 UTCEG score recompute
  18. 2026-08-16 02:49 UTCVendor advisory
  19. 2026-08-16 02:49 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 04:06 UTCEG score recompute
  22. 2026-08-15 04:06 UTCVendor advisory
  23. 2026-08-15 04:06 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 05:22 UTCEG score recompute
Show 60 more
  1. 2026-08-14 05:22 UTCVendor advisory
  2. 2026-08-14 05:22 UTCGHSA enrichment
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-13 06:39 UTCEG score recompute
  5. 2026-08-13 06:39 UTCVendor advisory
  6. 2026-08-13 06:39 UTCGHSA enrichment
  7. 2026-08-12 13:51 UTCEPSS rescore
  8. 2026-08-12 07:56 UTCEG score recompute
  9. 2026-08-12 07:56 UTCVendor advisory
  10. 2026-08-12 07:56 UTCGHSA enrichment
  11. 2026-08-11 09:13 UTCEG score recompute
  12. 2026-08-11 09:13 UTCVendor advisory
  13. 2026-08-11 09:13 UTCGHSA enrichment
  14. 2026-08-11 00:00 UTCEPSS rescore
  15. 2026-08-10 10:30 UTCEG score recompute
  16. 2026-08-10 10:30 UTCVendor advisory
  17. 2026-08-10 10:30 UTCGHSA enrichment
  18. 2026-08-09 13:46 UTCEPSS rescore
  19. 2026-08-09 11:47 UTCEG score recompute
  20. 2026-08-09 11:47 UTCVendor advisory
  21. 2026-08-09 11:47 UTCGHSA enrichment
  22. 2026-08-08 16:37 UTCEPSS rescore
  23. 2026-08-08 13:04 UTCEG score recompute
  24. 2026-08-08 13:04 UTCVendor advisory
  25. 2026-08-08 13:04 UTCGHSA enrichment
  26. 2026-08-07 14:20 UTCVendor advisory
  27. 2026-08-07 14:20 UTCGHSA enrichment
  28. 2026-08-06 15:37 UTCEG score recompute
  29. 2026-08-06 15:37 UTCVendor advisory
  30. 2026-08-06 15:37 UTCGHSA enrichment
  31. 2026-08-06 13:47 UTCEPSS rescore
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-05 16:54 UTCVendor advisory
  34. 2026-08-05 16:54 UTCGHSA enrichment
  35. 2026-08-04 18:10 UTCEG score recompute
  36. 2026-08-04 18:10 UTCVendor advisory
  37. 2026-08-04 18:10 UTCGHSA enrichment
  38. 2026-08-04 15:10 UTCEPSS rescore
  39. 2026-08-04 10:39 UTCEPSS rescore
  40. 2026-08-03 19:27 UTCEG score recompute
  41. 2026-08-03 19:27 UTCVendor advisory
  42. 2026-08-03 19:27 UTCGHSA enrichment
  43. 2026-08-03 10:36 UTCEPSS rescore
  44. 2026-08-02 20:44 UTCEG score recompute
  45. 2026-08-02 20:44 UTCVendor advisory
  46. 2026-08-02 20:44 UTCGHSA enrichment
  47. 2026-08-02 02:27 UTCEPSS rescore
  48. 2026-08-01 22:01 UTCEG score recompute
  49. 2026-08-01 22:01 UTCVendor advisory
  50. 2026-08-01 22:01 UTCGHSA enrichment
  51. 2026-08-01 04:16 UTCEPSS rescore
  52. 2026-07-31 23:18 UTCEG score recompute
  53. 2026-07-31 23:18 UTCGHSA enrichment
  54. 2026-07-31 15:35 UTCEG score recompute
  55. 2026-07-31 15:35 UTCGHSA enrichment
  56. 2026-07-30 16:51 UTCVendor advisory
  57. 2026-07-30 16:27 UTCEG score recompute
  58. 2026-07-30 16:27 UTCVendor advisory
  59. 2026-07-30 16:11 UTCEG score recompute
  60. 2026-07-30 16:11 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-58216?
CVE-2026-58216 is a medium vulnerability 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 disclosed?
CVE-2026-58216 was first published in the National Vulnerability Database on July 30, 2026, with the most recent update on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58216 actively exploited?
CVE-2026-58216 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 58.3% of all scored CVEs.
What is the CVSS score of CVE-2026-58216?
CVE-2026-58216 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-58216?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58216, 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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