CVE-2026-43888

HIGHNVD 8.78.7
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.4% (30th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated

Also known asEUVD-2026-29332 (ENISA EUVD)Source: ENISA EUVD

8.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 8.7Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

Outline is a service that allows for collaborative documentation. Prior to 1.7.0, ZipHelper.extract computes the extraction path for each entry by passing a full filesystem path through trimFileAndExt, a filename helper that calls path.basename on its input when truncating. When a zip entry's nested path is long enough to push the joined filesystem path over MAX_PATH_LENGTH (4096 bytes), trimFileAndExt silently drops all directory components and returns a bare filename. fs.createWriteStream then opens the file relative to the process working directory instead of inside the extraction sandbox, and the escaped file persists after import cleanup because cleanupExtractedData only removes the temporary extraction directory. This vulnerability is fixed in 1.7.0.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
55
EG Risk 55/100

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)
Severity87% × 45%
Impact severity (EG Severity): CVSS 8.7 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, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
30th
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 (8.7): severity, escalated by confirmed exploitation. This CVE's 8.7 is its impact severity (EG Severity), not escalated.

EG Severity
8.7 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). 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, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 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 low, Track* at medium and Attend at high mission impact.

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 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 total (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

May 11, 2026

Last Modified

May 12, 2026

Advisory Details (1)

Auto-updated May 11, 2026
Fix named in the CVE record. Sources: github.
GitHub advisoryMentions a patch (unverified)

Zip Extraction Path Escape via PATH_MAX Truncation in Collection Import · Advisory · outline/outline · GitHub

https://github.com/outline/outline/security/advisories/GHSA-hw32-2v7j-mgqc

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 37× 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 188 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 88 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 11:08 UTCEG score recompute
  2. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  3. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  4. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  5. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  6. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  7. 2026-10-25 14:28 UTCEG score recompute
  8. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-24 00:38 UTCEG score recompute
  10. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-18 03:39 UTCEG score recompute
  17. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-10-17 14:08 UTCEG score recompute
  19. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  22. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-10-12 16:05 UTCEG score recompute
  25. 2026-10-11 19:47 UTCEG score recompute
Show 75 more
  1. 2026-10-11 17:02 UTCEG score recompute
  2. 2026-10-11 14:28 UTCEG score recompute
  3. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  4. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  14. 2026-09-30 06:58 UTCOSV refresh
  15. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  16. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  19. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  20. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  23. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  24. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  25. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  26. 2026-09-11 11:53 UTCOSV refresh
  27. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  28. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  29. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  30. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  31. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  32. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  33. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  34. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  35. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  36. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  37. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  38. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  39. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  40. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  41. 2026-08-23 18:33 UTCEG score recompute
  42. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  43. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  44. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  45. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  46. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  47. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  48. 2026-08-17 11:00 UTCEG score recompute
  49. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  50. 2026-08-16 04:21 UTCEG score recompute
  51. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  52. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  53. 2026-08-14 02:53 UTCEG score recompute
  54. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  55. 2026-08-12 16:27 UTCEG score recompute
  56. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  57. 2026-08-11 15:45 UTCEG score recompute
  58. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  59. 2026-08-11 01:51 UTCEG score recompute
  60. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  61. 2026-08-09 14:04 UTCEG score recompute
  62. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  63. 2026-08-09 02:11 UTCEG score recompute
  64. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  65. 2026-08-08 01:22 UTCEG score recompute
  66. 2026-08-07 01:34 UTCEG score recompute
  67. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  68. 2026-08-05 21:54 UTCEG score recompute
  69. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  70. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  71. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  72. 2026-08-03 19:22 UTCEG score recompute
  73. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  74. 2026-08-02 12:06 UTCEG score recompute
  75. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.4% · 29th percentile

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Frequently asked(5)

What is CVE-2026-43888?
CVE-2026-43888 is a high-severity vulnerability; its CVE record was published on May 11, 2026. Outline is a service that allows for collaborative documentation. Prior to 1.7.0, ZipHelper.extract computes the extraction path for each entry by passing a full filesystem path through trimFileAndExt, a filename helper that calls path.basename on its input when truncating. When a zip entry's…
When was the CVE record for CVE-2026-43888 published?
The CVE record for CVE-2026-43888 was published on May 11, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of May 12, 2026; the record at its source may have been updated since.
Is CVE-2026-43888 actively exploited?
CVE-2026-43888 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43888?
CVE-2026-43888 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-43888?
The CVE record for CVE-2026-43888 names the fix: "This vulnerability is fixed in 1.7.0."

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