CVE-2026-40491

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 72% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
6.5(medium)
EPSS
43.6%
KEV
Not listed

Published

April 18, 2026

Last Modified

May 1, 2026

Advisory Details (3)

Auto-updated May 1, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

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

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

Release v5.2.2 · wkentaro/gdown · GitHub

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

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

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
gdown1.0.0 ... 5.2.1 (92 versions)5.2.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-07-16 17:03 UTCEPSS rescore
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  1. 2026-06-25 13:49 UTCEPSS rescore
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  55. 2026-05-20 16:48 UTCEG score recompute
  56. 2026-05-20 11:22 UTCEPSS rescore
  57. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40491?
CVE-2026-40491 is a medium vulnerability 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 CVE-2026-40491 disclosed?
CVE-2026-40491 was first published in the National Vulnerability Database on April 18, 2026, with the most recent update on May 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40491 actively exploited?
CVE-2026-40491 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 43.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40491, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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