Vulnerability in jruby
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as DEBIAN-CVE-2019-16254 has been found in jruby.
Risk of unauthorized operations or information disclosure.
What to do: upgrade jruby to 9.3.9.0+ds-1 or later.
If unsure, ask your IT team or search "jruby DEBIAN-CVE-2019-16254" on the vendor's site.
DEBIAN-CVE-2019-16254 (jruby)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 9.3.9.0+ds-1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in jruby.
Check the vendor advisory for the affected versions of jruby.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 9.3.9.0+ds-1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'jruby' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1
Identify exposureidentify
grep -r 'jruby' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
jrubyを grep し、稼働しているサービス・バージョンを把握する。 -
2
Apply patchpatch
Upgrade jruby to 9.3.9.0+ds-1ステージング環境で 9.3.9.0+ds-1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3
Post-deployment verificationverify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
| Ecosystem | Package | Affected | Fixed |
|---|---|---|---|
| Debian:12 | jruby |
< 9.3.9.0+ds-1 |
9.3.9.0+ds-1 |
| Debian:13 | jruby |
< 9.3.9.0+ds-1 |
9.3.9.0+ds-1 |
| Debian:14 | jruby |
< 9.3.9.0+ds-1 |
9.3.9.0+ds-1 |
Original description The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory security-tracker.debian.org