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TI-2019-12183 Aliases CVE-2019-16201GHSA-26h5-qgg3-p324

WEBrick::HTTPAuth::DigestAuth in Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x…

Priority MEDIUM 41CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 7 fixed, 5 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-287.

Summary

WEBrick::HTTPAuth::DigestAuth in Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 has a regular expression Denial of Service cause by looping/backtracking. A victim must expose a WEBrick server that uses DigestAuth to the Internet or a untrusted network.

Why it matters now

EPSS 0.05086 92nd percentileScored 2026-11-07
Fix Partial Red Hat: 6 advisoriesRed Hat: 7 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:*:*:*:*:*:*:*:*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 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 6 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
Show 3 more Red Hat advisories
  • 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: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat 3scale API Management Platform 2AffectedNo fix planned: Will not fix
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 planned: Will not fix
Red Hat Software CollectionsAffectedNo fix planned: Will not fix
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 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

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-16201
  2. 2026-10-03 Alias added: GHSA-26h5-qgg3-p324

References

Advisory 5

Other 6

Sources

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