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TI-2019-12236 Aliases CVE-2019-16254GHSA-w9fp-2996-hhwx

Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response…

Priority LOW 31CWE-74Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Partial Red Hat: 8 fixed, 5 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF.

Why it matters now

EPSS 0.04569 91st percentileScored 2026-11-07
Fix Partial Red Hat: 9 advisoriesRed Hat: 8 fixed, 5 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*up to 2.3.0; 2.4.0 – 2.4.7; 2.5.0 – 2.5.6; 2.6.0 – 2.6.4Vulnerableruby
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
  • cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:* Versions up to 2.3.0; 2.4.0 – 2.4.7; 2.5.0 – 2.5.6; 2.6.0 – 2.6.4 Vulnerable ·ruby
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian

Remediation

Red Hat 9 advisories

  • RHSA-2026:8838 Released 2026-04-17 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images ruby4.0-4.0.0-33.3.hum1@aarch64, ruby4.0-4.0.0-33.3.hum1@src, ruby4.0-4.0.0-33.3.hum1@x86_64 +10
  • RHSA-2026:7307 Released 2026-04-09 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images ruby3.4-3.4.8-31.1.hum1@aarch64, ruby3.4-3.4.8-31.1.hum1@src, ruby3.4-3.4.8-31.1.hum1@x86_64 +10
  • RHSA-2026:7305 Released 2026-04-09 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images ruby3.3-3.3.10-23.1.hum1@aarch64, ruby3.3-3.3.10-23.1.hum1@src, ruby3.3-3.3.10-23.1.hum1@x86_64 +10
Show 6 more Red Hat advisories
  • RHSA-2022:0582 Released 2022-02-21 · Red Hat rating Important
    ruby:2.6 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) ruby-2.6.9-107.module+el8.2.0+14086+86d863af.aarch64::ruby:2.6, ruby-2.6.9-107.module+el8.2.0+14086+86d863af.i686::ruby:2.6, ruby-2.6.9-107.module+el8.2.0+14086+86d863af.ppc64le::ruby:2.6 +47
  • RHSA-2022:0581 Released 2022-02-21 · Red Hat rating Important
    ruby:2.6 security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) ruby-2.6.9-107.module+el8.1.0+14088+04cf326e.i686::ruby:2.6, ruby-2.6.9-107.module+el8.1.0+14088+04cf326e.ppc64le::ruby:2.6, ruby-2.6.9-107.module+el8.1.0+14088+04cf326e.src::ruby:2.6 +47
  • RHSA-2021:2587 Released 2021-06-29 · Red Hat rating Moderate
    ruby:2.5 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) ruby-2.5.9-107.module+el8.4.0+10822+fe4fffb1.aarch64::ruby:2.5, ruby-2.5.9-107.module+el8.4.0+10822+fe4fffb1.i686::ruby:2.5, ruby-2.5.9-107.module+el8.4.0+10822+fe4fffb1.ppc64le::ruby:2.5 +47
  • RHSA-2021:2588 Released 2021-06-29 · Red Hat rating Moderate
    ruby:2.6 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) ruby-2.6.7-107.module+el8.4.0+10830+bbd85cce.aarch64::ruby:2.6, ruby-2.6.7-107.module+el8.4.0+10830+bbd85cce.i686::ruby:2.6, ruby-2.6.7-107.module+el8.4.0+10830+bbd85cce.ppc64le::ruby:2.6 +47
  • RHSA-2021:2230 Released 2021-06-03 · Red Hat rating Moderate
    rh-ruby26-ruby security, bug fix, and enhancement update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-ruby26-ruby-2.6.7-119.el7, rh-ruby26-ruby-devel-2.6.7-119.el7, rh-ruby26-ruby-doc-2.6.7-119.el7 +18
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-ruby26-ruby-2.6.7-119.el7, rh-ruby26-ruby-devel-2.6.7-119.el7, rh-ruby26-ruby-doc-2.6.7-119.el7 +18
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-ruby26-ruby-2.6.7-119.el7, rh-ruby26-ruby-devel-2.6.7-119.el7, rh-ruby26-ruby-doc-2.6.7-119.el7 +18
  • RHSA-2021:2104 Released 2021-05-26 · Red Hat rating Moderate
    rh-ruby25-ruby security, bug fix, and enhancement update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-ruby25-ruby-2.5.9-9.el7, rh-ruby25-ruby-devel-2.5.9-9.el7, rh-ruby25-ruby-doc-2.5.9-9.el7 +17
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-ruby25-ruby-2.5.9-9.el7, rh-ruby25-ruby-devel-2.5.9-9.el7, rh-ruby25-ruby-doc-2.5.9-9.el7 +17
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-ruby25-ruby-2.5.9-9.el7, rh-ruby25-ruby-devel-2.5.9-9.el7, rh-ruby25-ruby-doc-2.5.9-9.el7 +17
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-ruby25-ruby-2.5.9-9.el7, rh-ruby25-ruby-devel-2.5.9-9.el7, rh-ruby25-ruby-doc-2.5.9-9.el7 +17

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat 3scale API Management Platform 2AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Software CollectionsAffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:2587, RHSA-2021:2588
Red Hat Enterprise Linux AppStream E4S (v. 8.1)Fixed RHSA-2022:0581
Red Hat Enterprise Linux AppStream EUS (v. 8.2)Fixed RHSA-2022:0582
Red Hat Hardened ImagesFixed RHSA-2026:7305, RHSA-2026:7307, RHSA-2026:8838
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:2104, RHSA-2021:2230
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2021:2104
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)Fixed RHSA-2021:2104, RHSA-2021:2230
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:2104, RHSA-2021:2230
Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-16254
  2. 2026-10-03 Alias added: GHSA-w9fp-2996-hhwx
  3. 2026-11-02 Affected versions changed · Red Hat

References

Advisory 10

Other 6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences