cve.bz

CVE-2026-47737

7.5 highEPSS 0.2%

High (7.5). EPSS 0.2% chance of exploitation in the next 30 days. Fixed in puma 7.2.1, 8.0.2.

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, Puma is vulnerable to source IP spoofing when set_remote_address proxy_protocol: :v1 is enabled and persistent connections are used because Puma incorrectly re-parses PROXY protocol headers after each keep-alive request on the same connection, allowing an attacker to inject a second PROXY header and overwrite REMOTE_ADDR. This issue is fixed in versions 7.2.1 and 8.0.2.

Severity

CVSS 3.1

7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-31)
CWEs
CWE-290, CWE-345
Published
Modified
Record from
the NVD, synced

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-2vqw-3mp8-cgmxRubyGemspuma>=8.0.0 <8.0.28.0.2
GHSA-2vqw-3mp8-cgmxRubyGemspuma>=5.5.0 <7.2.17.2.1

References

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