CVE-2019-16254

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 5%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
90.6%
KEV
Not listed

Published

November 26, 2019

Last Modified

November 21, 2024

References (32)

Vendor Advisories for CVE-2019-16254(9)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubunturuby2.3-tcltk (2.3.1-2~ubuntu16.04.14) @ xenial2026-05-27ubuntu
redhatruby4-0-main-4.0.0-33.3.hum12026-04-17redhat
redhatruby3-4-main-3.4.8-31.1.hum12026-04-09redhat
redhatruby3-3-main-3.3.10-23.1.hum12026-04-09redhat
redhatruby:2.6-8010020220201152941.c27ad7f82022-02-21redhat
redhatruby:2.6-8020020220201131207.4cda2c842022-02-21redhat
redhatruby:2.5-8040020200923213910.522a0ee42021-06-29redhat
redhatruby:2.6-8040020210430142949.522a0ee42021-06-29redhat
redhatrh-ruby26-ruby-0:2.6.7-119.el72021-06-03redhat
redhatrh-ruby25-ruby-0:2.5.9-9.el72021-05-26redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:21 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
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  7. 2026-07-20 00:48 UTCOSV refresh
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  1. 2026-07-07 13:43 UTCEPSS rescore
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  6. 2026-07-04 06:28 UTCEPSS rescore
  7. 2026-07-02 15:52 UTCOSV refresh
  8. 2026-07-01 15:03 UTCEPSS rescore
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  33. 2026-06-14 23:15 UTCEPSS rescore
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  35. 2026-06-14 13:43 UTCOSV refresh
  36. 2026-06-13 22:58 UTCEPSS rescore
  37. 2026-06-12 23:09 UTCEPSS rescore
  38. 2026-06-11 13:58 UTCEPSS rescore
  39. 2026-06-11 13:58 UTCEPSS rescore
  40. 2026-06-10 22:16 UTCEPSS rescore
  41. 2026-06-10 13:19 UTCEPSS rescore
  42. 2026-06-08 14:15 UTCEPSS rescore
  43. 2026-06-08 14:14 UTCEPSS rescore
  44. 2026-06-07 15:23 UTCEPSS rescore
  45. 2026-06-07 15:22 UTCEPSS rescore
  46. 2026-06-06 13:45 UTCEPSS rescore
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  48. 2026-06-05 22:45 UTCEPSS rescore
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  59. 2026-05-31 00:14 UTCEPSS rescore
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  61. 2026-05-29 13:42 UTCEPSS rescore
  62. 2026-05-28 13:43 UTCEPSS rescore
  63. 2026-05-27 13:38 UTCEPSS rescore
  64. 2026-05-27 11:05 UTCEG score recompute
  65. 2026-05-27 11:05 UTCVendor advisory
  66. 2026-05-27 11:05 UTCGHSA enrichment
  67. 2026-05-26 13:42 UTCEPSS rescore
  68. 2026-05-26 13:42 UTCEPSS rescore
  69. 2026-05-26 07:17 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2019-16254?
CVE-2019-16254 is a medium vulnerability published on November 26, 2019. 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.…
When was CVE-2019-16254 disclosed?
CVE-2019-16254 was first published in the National Vulnerability Database on November 26, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-16254 actively exploited?
CVE-2019-16254 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-16254?
CVE-2019-16254 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2019-16254?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-16254, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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