CVEvulnerability

CVE-2020-5249

6.5 MEDIUM Published 2020-03-02 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-03-02
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0 ([email protected])
4.0 MEDIUM — AV:N/AC:L/Au:S/C:N/I:P/A:N
Weaknesses
CWE-113, CWE-74

Description

In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2020-5247, which fixed this vulnerability but only for regular responses. This has been fixed in 4.3.3 and 3.12.4.

Affected configurations

• puma puma (<= 3.12.3) • puma puma (>= 4.0.0 <= 4.3.2)

Related

Weakness · CWE (2)

  • CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component weakness

References