CVE-2026-11850

MEDIUMPre-NVD 5.05.0
EchelonGraph scoreMEDIUM confidence

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

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, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-36219 (ENISA EUVD) · GHSA-85rq-mqr4-hjw7 (GitHub Security Advisories)Source: ENISA EUVD

5.0EG
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: 0.3%CVSS: 5.0Exploit: None knownExposed services: Not assessed

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
5.0MEDIUMmedium confidence
EG Risk
23
EG Risk 23/100

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)
Severity50% × 45%
Impact severity (EG Severity): CVSS 5.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 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
0.3%
EPSS %ILE
19th
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 (5.0): severity, escalated by confirmed exploitation. This CVE's 5.0 is its impact severity (EG Severity), not escalated.

EG Severity
5.0 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% 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: 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.

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

June 11, 2026

Last Modified

August 31, 2026

Advisory Details (3)

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

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
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-11850
Red HatMentions a patch (unverified)
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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibkrb5support0 (1.22.1-2ubuntu4.1) @ resolute2026-10-23ubuntu
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 rangeFix by version rangeDependents
krb51.18.3-6 ... 1.22.1-3 (33 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
krb51.20.1-2 ... 1.22.1-3 (23 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
krb51.21.3-5 ... 1.22.1-3 (6 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
krb51.21.3-5, 1.22.1-1, 1.22.1-2, 1.22.1-2.1
  • every version up to 1.22.1-3: fixed in 1.22.1-3
—

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 8× 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 309 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 209 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  3. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  4. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  5. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  6. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  7. 2026-10-25 14:50 UTCEG score recompute
  8. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  9. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-10-23 07:40 UTCEG score recompute
  11. 2026-10-23 07:40 UTCVendor advisory
  12. 2026-10-23 07:40 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  13. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  14. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  15. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  16. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  17. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  18. 2026-10-18 05:04 UTCEG score recompute
  19. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  20. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  21. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  22. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  23. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  24. 2026-10-12 16:37 UTCEG score recompute
  25. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
Show 75 more
  1. 2026-10-11 20:13 UTCEG score recompute
  2. 2026-10-11 18:25 UTCEG score recompute
  3. 2026-10-11 14:58 UTCEG score recompute
  4. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  5. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  6. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  7. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  8. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  9. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  10. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  11. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  12. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  13. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  14. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  15. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  16. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  17. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  18. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  22. 2026-09-14 04:11 UTCEG score recompute
  23. 2026-09-14 04:11 UTCVendor advisory
  24. 2026-09-14 04:11 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  25. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  26. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  27. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  28. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  29. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  30. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  31. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  33. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  34. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  35. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  36. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  37. 2026-08-31 18:36 UTCEG score recompute
  38. 2026-08-31 18:36 UTCVendor advisory
  39. 2026-08-31 18:36 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  40. 2026-08-31 17:47 UTCEG score recompute
  41. 2026-08-31 17:47 UTCVendor advisory
  42. 2026-08-31 17:47 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  43. 2026-08-31 16:22 UTCVendor advisory
  44. 2026-08-31 16:22 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  45. 2026-08-31 00:06 UTCEG score recompute
  46. 2026-08-31 00:06 UTCVendor advisory
  47. 2026-08-31 00:06 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  48. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  49. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  50. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  51. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  52. 2026-08-25 00:07 UTCEG score recompute
  53. 2026-08-25 00:07 UTCVendor advisory
  54. 2026-08-25 00:07 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  55. 2026-08-23 10:44 UTCEG score recompute
  56. 2026-08-23 10:44 UTCVendor advisory
  57. 2026-08-23 10:44 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  58. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  59. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  60. 2026-08-21 13:22 UTCEG score recompute
  61. 2026-08-21 13:22 UTCVendor advisory
  62. 2026-08-21 13:22 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  63. 2026-08-21 12:31 UTCEG score recompute
  64. 2026-08-21 12:31 UTCVendor advisory
  65. 2026-08-21 12:31 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  66. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  67. 2026-08-20 17:16 UTCEG score recompute
  68. 2026-08-20 17:16 UTCVendor advisory
  69. 2026-08-20 17:16 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  70. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  71. 2026-08-19 14:54 UTCEG score recompute
  72. 2026-08-19 14:54 UTCVendor advisory
  73. 2026-08-19 14:54 UTCGHSA enrichmentGHSA-85rq-mqr4-hjw7 · GitHub CVSS 5.0
  74. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  75. 2026-08-17 08:05 UTCEG score recompute

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ubuntu:USN-8585-1

Frequently asked(5)

What is CVE-2026-11850?
CVE-2026-11850 is a medium-severity vulnerability; its CVE record was 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 made public?
CVE-2026-11850 was made public on June 10, 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 June 11, 2026. EchelonGraph's copy of the record carries a last-modified date of August 31, 2026; the record at its source may have been updated since.
Is CVE-2026-11850 actively exploited?
CVE-2026-11850 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-11850?
CVE-2026-11850 has a CVSS base score of 5.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-11850?
A fix for CVE-2026-11850 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-11850 are linked in the Vendor Advisories panel on this page.

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