https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-03T00:00:22.994137+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/bdu:2020-04071 bdu:2020-04071 2026-10-03T00:00:23.417475+00:00 bdu:2020-04071 https://cve.radiocsirt.org/vuln/cnvd-2020-31666 cnvd-2020-31666 2026-10-03T00:00:23.417519+00:00 cnvd-2020-31666 https://cve.radiocsirt.org/vuln/euvd-2026-40382 EUVD-2026-40382 2026-10-03T00:00:23.417534+00:00 EUVD-2026-40382 https://cve.radiocsirt.org/vuln/fkie_cve-2020-11076 fkie_cve-2020-11076 2026-10-03T00:00:23.417546+00:00

In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.

 https://cve.radiocsirt.org/vuln/ghsa-x7jg-6pwg-fx5h GHSA-x7jg-6pwg-fx5h — HTTP Smuggling via Transfer-Encoding Header in Puma 2026-10-03T00:00:23.417590+00:00

Affected: RubyGems: puma

### Impact

By using an invalid transfer-encoding header, an attacker could [smuggle an HTTP response.](https://portswigger.net/web-security/request-smuggling)

Originally reported by @ZeddYu, who has our thanks for the detailed report.

### Patches

The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.

### For more information

If you have any questions or comments about this advisory:

* Open an issue in [Puma](https://github.com/puma/puma) * See our [security policy](https://github.com/puma/puma/security/policy)

 https://cve.radiocsirt.org/vuln/gsd-2020-11076 gsd-2020-11076 2026-10-03T00:00:23.417625+00:00 gsd-2020-11076 https://cve.radiocsirt.org/vuln/oesa-2021-1169 OESA-2021-1169 — rubygem-puma security update 2026-10-03T00:00:23.417637+00:00

Affected: openEuler:20.03-LTS-SP1: rubygem-puma

Security Fix(es): In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.(CVE-2020-11076) In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client. This is a similar but different vulnerability from CVE-2020-11076. The problem has been fixed in Puma 3.12.6 and Puma 4.3.5.(CVE-2020-11077)

 https://cve.radiocsirt.org/vuln/opensuse-su-2020:0990-1 openSUSE-SU-2020:0990-1 — Security update for rubygem-puma 2026-10-03T00:00:23.417664+00:00

Security update for rubygem-puma

 https://cve.radiocsirt.org/vuln/suse-su-2020:1919-1 SUSE-SU-2020:1919-1 — Security update for rubygem-puma 2026-10-03T00:00:23.417683+00:00

Security update for rubygem-puma

 https://cve.radiocsirt.org/vuln/ubuntu-cve-2020-11076 UBUNTU-CVE-2020-11076 2026-10-03T00:00:23.417698+00:00

Affected: Ubuntu:Pro:20.04:LTS: puma

In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.