CVE-2026-11850

MEDIUMPre-NVD 5.05.0—
EchelonGraph scoreMEDIUM confidence

Score 5.0 from GitHub Security Advisory published 2026-06-11. a secondary CVSS source baseline 5.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.0Exploit: None knownExposed: 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 PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

June 11, 2026

Last Modified

August 31, 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(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibkrb5support0 (1.22.1-2ubuntu4.1) @ resolute2026-09-14ubuntu
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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
krb51.18.3-6 ... 1.22.1-3 (33 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
krb51.20.1-2 ... 1.22.1-3 (23 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
krb51.21.3-5 ... 1.22.1-3 (6 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
krb51.21.3-5, 1.22.1-1, 1.22.1-2, 1.22.1-2.11.22.1-3—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 54× 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 264 total refreshes for this CVE.

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

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 August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11850 actively exploited?
CVE-2026-11850 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 80.7% of all scored CVEs.
What is the CVSS score of CVE-2026-11850?
CVE-2026-11850 has a CVSS v3 base score of 5.0 (NVD).
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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