CVE-2026-11850

MEDIUMPre-NVD 5.05.0—
EchelonGraph scoreMEDIUM confidence

Score 5.0 from GitHub Security Advisory published 2026-06-11. the CNA's CVSS baseline 5.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 4 sources updated this week
5.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.0Exploit: NoneExposed: 0

A fix is available — apply it.

An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c. The function performs an unsigned subtraction (bv_len - 2) without a prior bounds check. When bv_len is 0 or 1, the subtraction wraps to a large value which is then truncated to uint16_t, yielding 0xFFFE (65534) or 0xFFFF (65535). The subsequent malloc succeeds and memcpy reads up to 65534 bytes from a 0-1 byte buffer, resulting in a heap out-of-bounds read. The attack vector involves a malicious or compromised LDAP KDB backend returning a krbExtraData attribute with bv_len < 2, triggering the underflow when the KDC or kadmind reads principal data.

CVSS v3
5.0
EG Score
5.0(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: 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
Severity50% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
17.8%
KEV
Not listed

Published

June 11, 2026

Last Modified

July 6, 2026

Advisory Details (3)

Auto-updated Jun 16, 2026
Patch available. Sources: redhat.
redhat

2459970 – (CVE-2026-11850) CVE-2026-11850 krb5: krb5: integer underflow in berval2tl_data() leads to heap out-of-bounds read

https://bugzilla.redhat.com/show_bug.cgi?id=2459970
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-11850
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:25520

Vendor Advisories for CVE-2026-11850(2)

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
redhatkrb5-main-1.22.2-8.hum12026-06-12redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 82× 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 123 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-11850?
CVE-2026-11850 is a medium vulnerability published on June 11, 2026. An integer underflow vulnerability was found in MIT krb5 in the berval2tldata() function in plugins/kdb/ldap/libkdbldap/ldapprincipal2.c. The function performs an unsigned subtraction (bvlen - 2) without a prior bounds check. When bvlen is 0 or 1, the subtraction wraps to a large value which is…
When was CVE-2026-11850 disclosed?
CVE-2026-11850 was first published in the National Vulnerability Database on June 11, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11850 actively exploited?
CVE-2026-11850 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-11850?
CVE-2026-11850 has a CVSS v4.0 base score of 5.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-11850?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11850, 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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