Vulnerability in libidn
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-2016-6263 has been found in libidn.
Risk of unauthorized operations or information disclosure.
What to do: upgrade libidn to 1.33-1 or later.
If unsure, ask your IT team or search "libidn DEBIAN-CVE-2016-6263" on the vendor's site.
DEBIAN-CVE-2016-6263 (libidn)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.33-1 — 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 libidn.
Check the vendor advisory for the affected versions of libidn.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.33-1.
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 'libidn' . 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 'libidn' . | 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
libidn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 libidn to 1.33-1ステージング環境で 1.33-1 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 | libidn |
< 1.33-1 |
1.33-1 |
| Debian:13 | libidn |
< 1.33-1 |
1.33-1 |
| Debian:14 | libidn |
< 1.33-1 |
1.33-1 |
Original description The description as published by the source.
The stringprep_utf8_nfkc_normalize function in lib/nfkc.c in libidn before 1.33 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via crafted UTF-8 data.
Source: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory security-tracker.debian.org