What is CVE-2022-45442?

CVE-2022-45442 is a high-severity vulnerability in Sinatra, classified under Download of Code Without Integrity Check. CVSS score: 8.8/10. Published 2022-11-28.

How severe is CVE-2022-45442?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2022-45442 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Sinatra

CVE-2022-45442

Sinatra is a domain-specific language for creating web applications in Ruby. An issue was discovered in Sinatra 2.0 before 2.2.3 and 3.0 before 3.0.4. An application is vulnerable to a reflected file download (RFD) attack that sets the Content-Disposition header of a response when the filename is derived from user-supplied input. Version 2.2.3 and 3.0.4 contain patches for this issue.

Published 2022-11-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.000

Affected products

Sinatra — versions >= 3.0, < 3.0.4, >= 2.0, < 2.2.3
Sinatrarb Sinatra
Debian Linux — versions 10.0

Weakness classification (CWE)

CWE-494 — Download of Code Without Integrity Check

Public proof-of-concept exploits

References

github.com/sinatra/sinatra/security/advisories/GHSA-2x8x-jmrp-phxw (Third Party Advisory)
github.com/sinatra/sinatra/commit/ea8fc9495a350f7551b39e3025bfcd06f49f363b (Patch, Third Party Advisory)
github.com/advisories/GHSA-8x94-hmjh-97hq (Not Applicable)
www.blackhat.com/docs/eu-14/materials/eu-14-Hafif-Reflected-File-Download-A-New… (Exploit, Third Party Advisory)
lists.debian.org/debian-lts-announce/2023/01/msg00005.html (mailing-list, Mailing List, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2022-45442?: CVE-2022-45442 is a high-severity vulnerability in Sinatra, classified under Download of Code Without Integrity Check. CVSS score: 8.8/10. Published 2022-11-28.
How severe is CVE-2022-45442?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2022-45442 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.