MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more tickets than ticket_info entries through gss_accept_sec_context() to crash GSS-API acceptor services, causing denial of service.
CVE-2026-107778
MEDIUMPre-NVD 6.56.5Trending — 5 sources updated this week
EchelonGraph scoreHIGH confidence
“—” beside the score: it is equal to the CVSS score beside it.
Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-10-08. A secondary CVSS source baseline 6.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
6.5EG
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: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 6.5
- EG Score
- 6.5MEDIUMhigh confidence
- EG Risk
- 29EG Risk 29/100
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 (value × EchelonGraph’s weight)Severity65% × 45%The EG Score, 6.5 of 10.Exploitation0.4% × 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
- 0.4%
- EPSS %ILE
- 34th
- KEV
- Not listed
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
October 8, 2026
Last Modified
October 9, 2026
Advisory Details (6)
Auto-updated Oct 8, 2026Patch available. Sources: github_commit, github_pr.
Web page
MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred() | Advisories | VulnCheck
https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-null-pointer-dereference-via-krb5-rd-credWeb page
krb5/src/lib/krb5/krb/rd_cred.c at krb5-1.22.2-final · krb5/krb5 · GitHub
https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c#L77-L112GitHub commit
commit 62196e2b2691 (krb5/krb5)
Fix landed in krb5/krb5 commit 62196e2b2691 — awaiting tagged release
https://github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282aGitHub commit
commit 48afa9abb89a (krb5/krb5)
Fix landed in krb5/krb5 commit 48afa9abb89a — awaiting tagged release
https://github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08GitHub pull request
Validate ticket_info count in KRB-CRED processing
Fix merged in krb5/krb5 PR #1511 on 2026-05-19 — awaiting tagged release
https://github.com/krb5/krb5/pull/1511Vendor Advisories for CVE-2026-107778(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(3 across 3 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| krb5 | 1.20.1-2 ... 1.22.1-3 (23 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| krb5 | 1.21.3-5 ... 1.22.1-3 (6 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| krb5 | 1.21.3-5, 1.22.1-1, 1.22.1-2, 1.22.1-2.1, 1.22.1-3 |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 22× in last 7d / 22× 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.
- 2026-10-12 16:38 UTCEG score recompute
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-11 20:14 UTCEG score recompute
- 2026-10-11 18:26 UTCEG score recompute
- 2026-10-11 15:00 UTCEG score recompute
- 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-11 09:07 UTCEG score recompute
- 2026-10-11 09:07 UTCVendor advisory
- 2026-10-11 09:06 UTCGHSA enrichmentGHSA-xfjm-wc9w-mmc6 · GitHub severity HIGH · GitHub CVSS 6.5
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-10 10:49 UTCEG score recompute
- 2026-10-10 10:49 UTCGHSA enrichmentGHSA-xfjm-wc9w-mmc6 · GitHub severity HIGH · GitHub CVSS 6.5
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-09 12:34 UTCEG score recompute
- 2026-10-09 12:34 UTCGHSA enrichmentGHSA-xfjm-wc9w-mmc6 · GitHub severity HIGH · GitHub CVSS 6.5
- 2026-10-09 11:54 UTCEG score recompute
- 2026-10-09 11:53 UTCGHSA enrichmentGHSA-xfjm-wc9w-mmc6 · GitHub severity HIGH · GitHub CVSS 6.5
- 2026-10-08 21:37 UTCEG score recompute
- 2026-10-08 21:37 UTCGHSA enrichmentGHSA-xfjm-wc9w-mmc6 · GitHub severity HIGH · GitHub CVSS 6.5
- 2026-10-08 21:20 UTCEG score recompute
- 2026-10-08 20:23 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
- 2026-10-08 20:23 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Same product
10 shownDebian:12:krb5
- CVE-2011-4862EG 10.0EPSS p100HIGH
- CVE-2011-0285EG 10.0EPSS p97HIGH
- CVE-2009-4212EG 10.0EPSS p94HIGH
- CVE-2009-0846EG 10.0EPSS p95HIGH
- CVE-2008-0947EG 10.0EPSS p95HIGH
- CVE-2007-5902EG 10.0EPSS p93HIGH
- CVE-2007-4743EG 10.0EPSS p91HIGH
- CVE-2007-3999EG 10.0EPSS p96HIGH
- CVE-2007-2442EG 10.0EPSS p96HIGH
- CVE-2007-0956EG 10.0EPSS p98HIGH
Frequently asked(5)
What is CVE-2026-107778?
CVE-2026-107778 is a medium-severity vulnerability; its CVE record was published on October 8, 2026. MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in makecredlist() in rdcred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more tickets than ticketinfo entries through…
When was CVE-2026-107778 made public?
CVE-2026-107778 was made public on May 19, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on October 8, 2026. EchelonGraph's copy of the record carries a last-modified date of October 9, 2026; the record at its source may have been updated since.
Is CVE-2026-107778 actively exploited?
CVE-2026-107778 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107778?
CVE-2026-107778 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107778?
A fix for CVE-2026-107778 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-107778 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-107778
Is Your Infrastructure Affected by CVE-2026-107778?
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