How severe is CVE-2026-33242?

CVE-2026-33242 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-33242 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33242?

CVE-2026-33242 affects Salvo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33242?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33242 have an EU (EUVD) identifier?

Yes. CVE-2026-33242 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14640.

When was CVE-2026-33242 published?

CVE-2026-33242 was published on 2026-03-24 and last updated on 2026-06-17.

CVE-2026-33242

CVE-2026-33242 is a high-severity vulnerability in Salvo with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14640
Weakness: CWE-22
Affected product: Salvo
Published: 2026-03-24
Last modified: 2026-06-17

Description

Salvo is a Rust web framework. Versions 0.39.0 through 0.89.2 have a Path Traversal and Access Control Bypass vulnerability in the salvo-proxy component. The vulnerability allows an unauthenticated external attacker to bypass proxy routing constraints and access unintended backend paths (e.g., protected endpoints or administrative dashboards). This issue stems from the encode_url_path function, which fails to normalize "../" sequences and inadvertently forwards them verbatim to the upstream server by not re-encoding the "." character. Version 0.89.3 contains a patch.

Frequently asked questions

What is CVE-2026-33242?: Salvo is a Rust web framework. Versions 0.39.0 through 0.89.2 have a Path Traversal and Access Control Bypass vulnerability in the salvo-proxy component. The vulnerability allows an unauthenticated external attacker to bypass proxy routing constraints and access unintended backend paths (e.g., protected endpoints or administrative dashboards). This issue stems from the encode_url_path function, which fails to normalize "../" sequences and inadvertently forwards them verbatim to the upstream server by not re-encoding the "." character. Version 0.89.3 contains a patch.
How severe is CVE-2026-33242?: CVE-2026-33242 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-33242 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33242?: CVE-2026-33242 affects Salvo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33242?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33242 have an EU (EUVD) identifier?: Yes. CVE-2026-33242 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14640.
When was CVE-2026-33242 published?: CVE-2026-33242 was published on 2026-03-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:salvo:salvo:*:*:*:*:*:rust:*:*

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