CVE-2026-107708

MEDIUMPre-NVD 4.94.9
EchelonGraph scoreMEDIUM confidence

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

Score 4.9 from GitHub Security Advisory (severity: MODERATE) published 2026-10-08. A secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-95255 (ENISA EUVD) · GHSA-wc3c-9xc9-26g8 (GitHub Security Advisories)Source: ENISA EUVD

4.9EG
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: 0.5%CVSS: 4.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a malformed client name to crash krb5kdc and deny authentication.

CVSS v3
4.9
EG Score
4.9MEDIUMmedium confidence
EG Risk
22
EG Risk 22/100

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)
Severity49% × 45%
Impact severity (EG Severity): CVSS 4.9 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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
0.5%
EPSS %ILE
44th
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 (4.9): severity, escalated by confirmed exploitation. This CVE's 4.9 is its impact severity (EG Severity), not escalated.

EG Severity
4.9 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-10). 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, and whom BOD 26-04 binds: 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.

The score's inputs: 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 14, 2026

Advisory Details (6)

Auto-updated Oct 8, 2026
Patch available. Sources: github_pr, github_commit.
Web page

MIT krb5 through 1.22.2 KDC NULL Pointer Dereference via S4U2Proxy PAC | Advisories | VulnCheck

https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-kdc-null-pointer-dereference-via-s4u2proxy-pac
Web page

GitHub - krb5/krb5: mirror of MIT krb5 repository · GitHub

https://github.com/krb5/krb5
Web page

krb5/src/kdc/kdc_util.c at krb5-1.22.2-final · krb5/krb5 · GitHub

https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/kdc/kdc_util.c#L639-L676
GitHub commit

commit a88a18cafa10 (krb5/krb5)

Fix landed in krb5/krb5 commit a88a18cafa10 — awaiting tagged release

https://github.com/krb5/krb5/commit/a88a18cafa1040a0c4f9c8d08288fc98831ec86d
GitHub commit

commit f6e2c397ceda (krb5/krb5)

Fix landed in krb5/krb5 commit f6e2c397ceda — awaiting tagged release

https://github.com/krb5/krb5/commit/f6e2c397ceda6467ebbaab8ed66d4895c9f1d6a7
GitHub pull request

Fix error propagation in get_pac_princ_with_realm

Fix merged in krb5/krb5 PR #1510 on 2026-05-19 — awaiting tagged release

https://github.com/krb5/krb5/pull/1510

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkrb5-main-1.22.2-10.3.hum12026-10-11redhat

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

(5 across 5 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
krb5—
  • every version up to 1.22.3-r0: fixed in 1.22.3-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
krb5—
  • every version up to 1.22.3-r0: fixed in 1.22.3-r0
—
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, 1.22.1-3
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-11-11 16:37 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-11-11 06:01 UTCEchelonGraph re-scored
  5. 2026-11-11 06:01 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub severity MODERATE · GitHub CVSS 4.9
  6. 2026-11-10 16:41 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  7. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  8. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  9. 2026-11-07 21:34 UTCEchelonGraph re-scored
  10. 2026-11-07 21:34 UTCVendor advisory
  11. 2026-11-07 21:34 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub severity MODERATE · GitHub CVSS 4.9
  12. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  13. 2026-11-06 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  14. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  15. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  16. 2026-11-04 00:46 UTCEchelonGraph re-scored
  17. 2026-11-04 00:46 UTCVendor advisory
  18. 2026-11-04 00:46 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub severity MODERATE · GitHub CVSS 4.9
  19. 2026-11-03 16:46 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  20. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  21. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  22. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  23. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  24. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  25. 2026-10-29 14:56 UTCEchelonGraph re-scored
Show 48 more
  1. 2026-10-29 14:56 UTCVendor advisory
  2. 2026-10-29 14:56 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub CVSS 4.9
  3. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  5. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-10-25 14:54 UTCEchelonGraph re-scored
  8. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-23 08:36 UTCEchelonGraph re-scored
  11. 2026-10-23 08:36 UTCVendor advisory
  12. 2026-10-23 08:36 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub CVSS 4.9
  13. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-10-18 05:07 UTCEchelonGraph re-scored
  19. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  22. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-14 02:26 UTCEchelonGraph re-scored
  24. 2026-10-14 02:26 UTCVendor advisory
  25. 2026-10-14 02:26 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub CVSS 4.9
  26. 2026-10-14 01:36 UTCEchelonGraph re-scored
  27. 2026-10-14 01:36 UTCVendor advisory
  28. 2026-10-14 01:36 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub CVSS 4.9
  29. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  30. 2026-10-12 16:38 UTCEchelonGraph re-scored
  31. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  32. 2026-10-11 23:11 UTCVendor advisory
  33. 2026-10-11 23:10 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub CVSS 4.9
  34. 2026-10-11 20:14 UTCEchelonGraph re-scored
  35. 2026-10-11 18:26 UTCEchelonGraph re-scored
  36. 2026-10-11 15:00 UTCEchelonGraph re-scored
  37. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  38. 2026-10-10 22:40 UTCEchelonGraph re-scored
  39. 2026-10-10 22:40 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub CVSS 4.9
  40. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  41. 2026-10-09 22:10 UTCEchelonGraph re-scored
  42. 2026-10-09 22:09 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub CVSS 4.9
  43. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  44. 2026-10-08 21:37 UTCEchelonGraph re-scored
  45. 2026-10-08 21:37 UTCGHSA enrichmentGHSA-wc3c-9xc9-26g8 · GitHub CVSS 4.9
  46. 2026-10-08 21:20 UTCEchelonGraph re-scored
  47. 2026-10-08 20:23 UTCEchelonGraph re-scoredFirst assessed: 4.9 MEDIUM
  48. 2026-10-08 20:23 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-107708?
CVE-2026-107708 is a medium-severity vulnerability; its CVE record was published on October 8, 2026. MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a…
When was CVE-2026-107708 made public?
CVE-2026-107708 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 14, 2026; the record at its source may have been updated since.
Is CVE-2026-107708 actively exploited?
CVE-2026-107708 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107708?
CVE-2026-107708 has a CVSS base score of 4.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107708?
A fix for CVE-2026-107708 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-107708 are linked in the Vendor Advisories panel on this page.

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