CVE-2026-33242Public exploitNetwork attack vector

Unauthenticated backend access via unnormalized proxy paths

Published Mar 23, 2026 · Updated Mar 23, 2026

Path traversal in Salvo 0.39.0 through 0.89.2 allows remote attackers to access unintended backend paths through salvo-proxy. The proxy passes an already decoded path to encode_url_path, whose encoding set leaves dot characters unchanged and forwards ../ sequences upstream. An unauthenticated request to a deployed proxy route is sufficient, exposing protected endpoints or administrative dashboards without granting write access.

CVSS severity7.5
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Salvo 0.39.0 through 0.89.2 allows remote attackers to access unintended backend paths through salvo-proxy. The proxy passes an already decoded path to encode_url_path, whose encoding set leaves dot characters unchanged and forwards ../ sequences upstream. An unauthenticated request to a deployed proxy route is sufficient, exposing protected endpoints or administrative dashboards without granting write access.

The record

CVE
CVE-2026-33242
Published
Mar 23, 2026
Updated
Mar 23, 2026
Vendor
Salvo
Product
Salvo
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.39.0, < 0.89.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Salvo · Salvoversion=>= 0.39.0, < 0.89.3

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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