CVE-2026-40491

MEDIUMNVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.8% (54th 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
Trending — 3 sources updated this weekElevated
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: 0.8%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

gdown is a Google Drive public file/folder downloader. Versions prior to 5.2.2 are vulnerable to a Path Traversal attack within the extractall functionality. When extracting a maliciously crafted ZIP or TAR archive, the library fails to sanitize or validate the filenames of the archive members. This allow files to be written outside the intended destination directory, potentially leading to arbitrary file overwrite and Remote Code Execution (RCE). Version 5.2.2 contains a fix.

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 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.
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
0.8%
EPSS %ILE
54th
KEV
Not listed

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.

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 18, 2026

Last Modified

May 1, 2026

Advisory Details (3)

Auto-updated May 1, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Arbitrary File Write via Path Traversal in gdown.extractall · Advisory · wkentaro/gdown · GitHub

https://github.com/wkentaro/gdown/security/advisories/GHSA-76hw-p97h-883f
Web page

Release v5.2.2 · wkentaro/gdown · GitHub

https://github.com/wkentaro/gdown/releases/tag/v5.2.2
Web page

fix: prevent path traversal in archive extraction and filename handling · wkentaro/gdown@af569fc · GitHub

https://github.com/wkentaro/gdown/commit/af569fc6ed300b7974dee66dc51e9f01b57b4dff

Affected Packages

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
gdown5.2.0+dfsg-2
  • every version up to 5.2.0+dfsg-2+deb13u1: fixed in 5.2.0+dfsg-2+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
gdown5.2.0+dfsg-2, 5.2.1+dfsg-1
  • every version up to 6.0.0+dfsg-1: fixed in 6.0.0+dfsg-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
gdown1.0.0 ... 5.2.1 (92 versions)
  • every version up to 5.2.2: fixed in 5.2.2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 28× 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 95 of 178 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. 5 repeat rows among the latest 100 are merged into the row they repeat. The 83 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  2. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  5. 2026-10-12 16:09 UTCEG score recompute
  6. 2026-10-11 19:51 UTCEG score recompute
  7. 2026-10-11 17:05 UTCEG score recompute
  8. 2026-10-11 14:31 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  11. 2026-10-10 18:55 UTCOSV refresh
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  18. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  20. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  21. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  22. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  23. 2026-09-21 06:19 UTCOSV refresh
  24. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 46th percentile
Show 70 more
  1. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  2. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  3. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  4. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  5. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  6. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  7. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  8. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  9. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  10. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  11. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  12. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  13. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  14. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  15. 2026-09-02 03:40 UTCOSV refresh
  16. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  17. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  18. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  19. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  20. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  21. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  22. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  23. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  24. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  25. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  26. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  27. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  28. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  29. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  30. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  31. 2026-08-16 06:28 UTCEG score recompute
  32. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  33. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  34. 2026-08-14 04:36 UTCEG score recompute
  35. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  36. 2026-08-12 18:46 UTCEG score recompute
  37. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  38. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  39. 2026-08-11 04:12 UTCEG score recompute
  40. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  41. 2026-08-10 04:02 UTCEG score recompute
  42. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  43. 2026-08-09 03:51 UTCEG score recompute
  44. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  45. 2026-08-07 13:18 UTCEG score recompute
  46. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  47. 2026-08-05 23:17 UTCEG score recompute
  48. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  49. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  50. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  51. 2026-08-03 21:29 UTCEG score recompute
  52. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  53. 2026-08-02 12:59 UTCEG score recompute
  54. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  55. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  56. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  57. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  58. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  59. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  60. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  61. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  62. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  63. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  64. 2026-07-23 03:11 UTCEG score recompute
  65. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  66. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  67. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  68. 2026-07-20 07:32 UTCOSV refresh
  69. 2026-07-19 14:31 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  70. 2026-07-19 02:29 UTCEPSS rescoreEPSS 0.6% · 43rd percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40491?
CVE-2026-40491 is a medium-severity vulnerability; its CVE record was published on April 18, 2026. gdown is a Google Drive public file/folder downloader. Versions prior to 5.2.2 are vulnerable to a Path Traversal attack within the extractall functionality. When extracting a maliciously crafted ZIP or TAR archive, the library fails to sanitize or validate the filenames of the archive members.…
When was the CVE record for CVE-2026-40491 published?
The CVE record for CVE-2026-40491 was published on April 18, 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 1, 2026; the record at its source may have been updated since.
Is CVE-2026-40491 actively exploited?
CVE-2026-40491 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-40491?
CVE-2026-40491 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-40491?
A fix for CVE-2026-40491 is available: update to the fixed version the vendor names in its advisory.

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