CVE-2026-91968

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (38th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-78644 (ENISA EUVD) · GHSA-jfw3-2gcf-23r5 (GitHub Security Advisories) · GHSA-xxc3-xpmc-vmvr (GitHub Security Advisories) · GO-2026-6759 (OSV.dev)Source: ENISA EUVD

6.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the task-filter endpoint that accepts deeply nested filter expressions without recursion depth limits. Authenticated attackers can supply thousands of nested parentheses in the filter query parameter to exhaust memory and terminate the API process.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100

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)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
38th
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 (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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 low or medium mission impact; Track* at high (mission-essential systems).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 low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (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

September 15, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
Patch available. Sources: github.
Web page

vikunja before 2.6.0 Denial of Service via unbounded filter recursion | Advisories | VulnCheck

https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-unbounded-filter-recursion
GitHub advisoryMentions a patch (unverified)

Unbounded nested task-filter recursion permits API process termination · Advisory · go-vikunja/vikunja · GitHub

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xxc3-xpmc-vmvr

Vendor Advisories for CVE-2026-91968(1)

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 / EcosystemFix (by version range) / PatchReleasedSource
gocode.vikunja.io/api @ 2.6.0 (fixes = 2.5.0)—ghsa

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

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
code.vikunja.io/api2.5.0
  • 2.5.0 up to 2.6.0: fixed in 2.6.0
  • 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 7× in last 7d / 32× 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.

Showing the most recent 100 of 114 rows on record for this CVE, as 99 entries (1 repeat merged).

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. 1 repeat row among the latest 100 is merged into the row it repeats. The 14 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:35 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  2. 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  3. 2026-11-10 16:46 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  4. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  5. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  6. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  7. 2026-11-06 16:40 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  8. 2026-11-05 16:39 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  9. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  10. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  11. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  12. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  13. 2026-11-01 07:37 UTCGHSA enrichmentGHSA-xxc3-xpmc-vmvr · GitHub severity HIGH
  14. 2026-11-01 07:37 UTCEchelonGraph re-scored
  15. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  16. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  17. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  18. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  19. 2026-10-27 18:25 UTCOSV refresh
  20. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  21. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  22. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  23. 2026-10-25 13:50 UTCEchelonGraph re-scored
  24. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
Show 74 more
  1. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  4. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  5. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  6. 2026-10-18 03:00 UTCEchelonGraph re-scored
  7. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-15 18:38 UTCEchelonGraph re-scored
  10. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-12 14:45 UTCEchelonGraph re-scored
  15. 2026-10-11 19:13 UTCEchelonGraph re-scored
  16. 2026-10-11 16:29 UTCEchelonGraph re-scored
  17. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-10-11 13:44 UTCEchelonGraph re-scored
  19. 2026-10-11 05:40 UTCEchelonGraph re-scored
  20. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-10-09 23:38 UTCEchelonGraph re-scored
  22. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-08 22:38 UTCEchelonGraph re-scored
  24. 2026-10-08 22:38 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  25. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  26. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  27. 2026-10-07 18:54 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  28. 2026-10-06 17:13 UTCEchelonGraph re-scored
  29. 2026-10-06 17:13 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  30. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  31. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  32. 2026-10-05 16:14 UTCEchelonGraph re-scored
  33. 2026-10-05 16:14 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  34. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  35. 2026-10-04 14:29 UTCEchelonGraph re-scored
  36. 2026-10-04 14:29 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  37. 2026-10-03 13:31 UTCEchelonGraph re-scored
  38. 2026-10-03 13:31 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  39. 2026-10-02 12:33 UTCEchelonGraph re-scored
  40. 2026-10-02 12:33 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  41. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  42. 2026-10-01 10:42 UTCEchelonGraph re-scored
  43. 2026-10-01 10:42 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  44. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  45. 2026-09-30 09:43 UTCEchelonGraph re-scored
  46. 2026-09-30 09:43 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  47. 2026-09-29 08:45 UTCEchelonGraph re-scored
  48. 2026-09-29 08:45 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  49. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  50. 2026-09-28 07:47 UTCEchelonGraph re-scored
  51. 2026-09-28 07:47 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  52. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  53. 2026-09-27 06:50 UTCEchelonGraph re-scored
  54. 2026-09-27 06:50 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  55. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  56. 2026-09-26 05:52 UTCEchelonGraph re-scored
  57. 2026-09-26 05:52 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  58. 2026-09-25 04:50 UTCEchelonGraph re-scored
  59. 2026-09-25 04:50 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  60. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  61. 2026-09-24 03:53 UTCEchelonGraph re-scored
  62. 2026-09-24 03:53 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  63. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  64. 2026-09-23 02:55 UTCEchelonGraph re-scored
  65. 2026-09-23 02:55 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  66. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  67. 2026-09-22 01:57 UTCEchelonGraph re-scored
  68. 2026-09-22 01:57 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  69. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  70. 2026-09-21 01:00 UTCEchelonGraph re-scored
  71. 2026-09-21 01:00 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5
  72. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  73. 2026-09-20 00:01 UTCEchelonGraph re-scored
  74. 2026-09-20 00:01 UTCGHSA enrichmentGHSA-jfw3-2gcf-23r5 · GitHub severity HIGH · GitHub CVSS 6.5

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-91968?
CVE-2026-91968 is a medium-severity vulnerability; its CVE record was published on September 15, 2026. vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the task-filter endpoint that accepts deeply nested filter expressions without recursion depth limits. Authenticated attackers can supply thousands of nested parentheses in the filter query parameter to exhaust memory and…
When was CVE-2026-91968 made public?
CVE-2026-91968 was made public on August 31, 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 September 15, 2026. EchelonGraph's copy of the record carries a last-modified date of September 16, 2026; the record at its source may have been updated since.
Is CVE-2026-91968 actively exploited?
CVE-2026-91968 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-91968?
CVE-2026-91968 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-2026-91968?
A fix for CVE-2026-91968 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-91968 are linked in the Vendor Advisories panel on this page.

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