VulnerabilityPublished 13 Aug 2026Updated 23 Oct 2026

CVE-2025-31486: Vite allows server.fs.deny to be bypassed with .svg or relative paths

Affects viteSource GCVE Database

Not known to be exploited · public detection template (Nuclei) · 40% EPSS · CVSS 5.3 Medium : upgrade to 6.2.5 when convenient.

Data as of 12 Nov 2026, 23:24 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 40.4% chance of exploitation in 30 days – higher than 98% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 6.2.5

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 13 Aug 2026
Detectable: evidence found.
nuclei template: Vite server.fs.deny Bypass - Local File Inclusion
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade vite to 6.2.5.

Affected software

Product	Affected	Fixed in
Homebrewvite`pkg:brew/vite`Other threats	Affected >=2.5.1 <6.2.5	Fixed in 6.2.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available for this vulnerability. Users should upgrade Vite to version 6.2.5 or later where this issue is fixed. Until patched, avoid exposing the Vite development server to untrusted networks by not using the --host option or server.host configuration to bind to public interfaces.

Description

Vite versions from 2.5.1 up to but not including 6.2.5 have a vulnerability that allows arbitrary file contents to be returned to the browser. This occurs when the Vite development server is exposed to the network using the --host option or server.host configuration. The vulnerability involves bypassing the server.fs.deny restriction via requests ending with .svg or using relative paths before normalization. The issue affects files smaller than the default 4kB inline asset limit in Vite 6.0 and later. Exploitation requires network access to the dev server and user interaction (UI:R).

Impact

An attacker with network access to the exposed Vite dev server can retrieve the contents of arbitrary files, potentially exposing sensitive information. The vulnerability does not allow modification or denial of service but compromises confidentiality. The CVSS 3.1 score is 5.3 (medium severity) reflecting network attack vector, high complexity, no privileges required, user interaction required, and high confidentiality impact.

Summary

CVE-2025-31486 is a vulnerability in Vite development server versions >=2.5.1 and <6.2.5 that allows an attacker to read arbitrary files from the server filesystem by bypassing the server.fs.deny configuration. The bypass is achieved through two methods: appending .svg with additional query parameters or headers to exploit asset loading logic for small files, and using relative paths that bypass checks applied before path normalization. This vulnerability only affects applications explicitly exposing the Vite dev server to the network (e.g., via --host).

References

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CVE-2025-31486: Vite allows server.fs.deny to be bypassed with .svg or relative paths

Exploitation evidence

What to do

Affected software

Description

Impact

Summary

Nuclei detection templates

Proofs of concept on GitHub

References

Community reviews

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 10 Oct 2026, 21:52 UTC

Public exploits and detectiona Nuclei detection template, GitHub proofs of concept

Technical details

References

Community reviews

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