CVE-2026-6843

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

Score 5.5 from GitHub Security Advisory published 2026-04-22. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-24708 (ENISA EUVD) · GHSA-9jvr-742w-rwph (GitHub Security Advisories)Source: ENISA EUVD

5.5EG
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: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in nano. A local user could exploit a format string vulnerability in the statusline() function. By creating a directory with a name containing printf specifiers, the application attempts to display this name, leading to a segmentation fault (SEGV). This results in a Denial of Service (DoS) for the nano application.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 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
0.1%
EPSS %ILE
1st
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 (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-26). 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

April 22, 2026

Last Modified

October 26, 2026

Advisory Details (2)

Auto-updated Jun 14, 2026
Patch available. Sources: redhat.
Red HatMentions a patch (unverified)

2460017 – (CVE-2026-6843) CVE-2026-6843 nano: nano: Format string vulnerability leads to Denial of Service

https://bugzilla.redhat.com/show_bug.cgi?id=2460017
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-6843

Vendor Advisories for CVE-2026-6843(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
ubuntunano-tiny (4.8-1ubuntu1.1+esm1) @ focal2026-10-26ubuntu

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
nano5.4-2 ... 9.1-1 (28 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
nano7.2-1 ... 9.2-1 (15 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nano8.4-1
  • every version up to 8.4-1+deb13u1: fixed in 8.4-1+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nano8.4-1, 8.5-1, 8.6-1, 8.7-1, 8.7.1-1
  • every version up to 9.0-1: fixed in 9.0-1
—

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 / 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 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 99 of 222 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 123 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-26 21:44 UTCEG score recompute
  3. 2026-10-26 21:44 UTCVendor advisory
  4. 2026-10-26 21:44 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  5. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  7. 2026-10-25 14:10 UTCEG score recompute
  8. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-10-22 19:32 UTCEG score recompute
  11. 2026-10-22 19:32 UTCVendor advisory
  12. 2026-10-22 19:32 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  13. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-10-18 03:19 UTCEG score recompute
  19. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-10-12 15:45 UTCEG score recompute
Show 74 more
  1. 2026-10-11 19:30 UTCEG score recompute
  2. 2026-10-11 16:45 UTCEG score recompute
  3. 2026-10-11 14:06 UTCEG score recompute
  4. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  19. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  26. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  27. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  28. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  29. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  30. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  31. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  32. 2026-09-01 12:27 UTCVendor advisory
  33. 2026-09-01 12:27 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  34. 2026-09-01 11:50 UTCVendor advisory
  35. 2026-09-01 11:50 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  36. 2026-08-31 16:43 UTCVendor advisory
  37. 2026-08-31 16:42 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  38. 2026-08-31 15:08 UTCEG score recompute
  39. 2026-08-31 15:08 UTCVendor advisory
  40. 2026-08-31 15:08 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  41. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  42. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  43. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  44. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  45. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  46. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  47. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  48. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  49. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  50. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  51. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  52. 2026-08-16 06:02 UTCEG score recompute
  53. 2026-08-16 06:02 UTCVendor advisory
  54. 2026-08-16 06:02 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  55. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  56. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  57. 2026-08-14 04:21 UTCEG score recompute
  58. 2026-08-14 04:21 UTCVendor advisory
  59. 2026-08-14 04:21 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  60. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  61. 2026-08-12 18:33 UTCEG score recompute
  62. 2026-08-12 18:33 UTCVendor advisory
  63. 2026-08-12 18:33 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  64. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  65. 2026-08-11 07:33 UTCEG score recompute
  66. 2026-08-11 07:33 UTCVendor advisory
  67. 2026-08-11 07:33 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  68. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  69. 2026-08-10 05:33 UTCEG score recompute
  70. 2026-08-10 05:33 UTCVendor advisory
  71. 2026-08-10 05:33 UTCGHSA enrichmentGHSA-9jvr-742w-rwph · GitHub CVSS 5.5
  72. 2026-08-09 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  73. 2026-08-09 03:34 UTCEG score recompute
  74. 2026-08-09 03:34 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-6843?
CVE-2026-6843 is a medium-severity vulnerability; its CVE record was published on April 22, 2026. A flaw was found in nano. A local user could exploit a format string vulnerability in the statusline() function. By creating a directory with a name containing printf specifiers, the application attempts to display this name, leading to a segmentation fault (SEGV). This results in a Denial of…
When was CVE-2026-6843 made public?
CVE-2026-6843 was made public on April 13, 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 April 22, 2026. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-6843 actively exploited?
CVE-2026-6843 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-6843?
CVE-2026-6843 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-6843?
A fix for CVE-2026-6843 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-6843 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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