CVE-2026-86258Disclosure

LOWCVSS 8.2 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

nbviewer through 1.0.1 contains a path traversal vulnerability in LocalFileHandler.can_show() that uses string-prefix comparison instead of proper path validation. Attackers can read files from sibling directories outside the configured root by requesting paths that share the root as a textual prefix, disclosing unintended notebooks and credentials.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-22

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://www.cve.org/CVERecord?id=CVE-2026-86258

Full discourse1 post

CVE@CVEnew46d
Disclosure
CVE-2026-86258 nbviewer through 1.0.1 contains a path traversal vulnerability in LocalFileHandler.can_show() that uses string-prefix comparison instead of proper path validation. At… https://www.cve.org/CVERecord?id=CVE-2026-86258
Post summary
CVE-2026-86258 is a path traversal vulnerability in nbviewer 1.0.1 that stems from improper path validation in LocalFileHandler.can_show(). No PoC, exploit, patch, or active exploitation details are provided.
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