Python
CVE-2026-21883
MEDIUM
GHSA-793v-589g-574v
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Lifecycle Timeline
4Blast Radius
ecosystem impact- 16 pypi packages depend on bokeh (10 direct, 6 indirect)
Ecosystem-wide dependent count for version 3.8.2.
DescriptionGitHub Advisory
Bokeh is an interactive visualization library written in Python. In versions 3.8.1 and below, if a server is configured with an allowlist (e.g., dashboard.corp), an attacker can register a domain like dashboard.corp.attacker.com (or use a subdomain if applicable) and lure a victim to visit it. The malicious site can then initiate a WebSocket connection to the vulnerable Bokeh server. Since the Origin header (e.g., http://dashboard.corp.attacker.com/) matches the allowlist according to the flawed logic, the connection is accepted. Once connected, the attacker can interact with the Bokeh server on behalf of the victim, potentially accessing sensitive data, or modifying visualizations. This issue is fixed in version 3.8.2.
AnalysisAI
Bokeh versions 3.8.1 and below allow attackers to bypass Origin validation in WebSocket connections by registering domains that suffix-match allowlisted domains (e.g., dashboard.corp.attacker.com for allowlist entry dashboard.corp), enabling unauthorized server interaction. Public exploit code exists for this vulnerability, which could allow attackers to access sensitive data or modify visualizations on behalf of victims. The issue is resolved in Bokeh 3.8.2.
Technical ContextAI
Affects Bokeh. Bokeh is an interactive visualization library written in Python. In versions 3.8.1 and below, if a server is configured with an allowlist (e.g., dashboard.corp), an attacker can register a domain like dashboard.corp.attacker.com (or use a subdomain if applicable) and lure a victim to visit it. The malicious site can then initiate a WebSocket connection to the vulnerable Bokeh server. Since the Origin header (e.g., http://dashboard.corp.attacker.com/) matches the allowlist according to the flawed
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 3.8.2.. Restrict network access to the affected service where possible.
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Same weakness CWE-1385 – Missing Origin Validation in WebSockets
View allVendor StatusVendor
SUSE
Severity: MediumShare
External POC / Exploit Code
Leaving vuln.today