LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers...
Summary
Vulnerability reported (CVE-2026-8368). Confidential information can be exposed externally. Exploitable via Authorization header.
Original description
The description as published by the source.
LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects.
On a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes.
A redirect to an attacker controlled host therefore discloses the caller's credentials to that host.
Source: NIST National Vulnerability Database NVD GitHub Advisory
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 CVE-2026-8368 has been found.
Attackers can target a specific entry point like Authorization header over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "CVE-2026-8368" on the vendor's site.
CVE-2026-8368 — CWE-522 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: Authorization header
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 (CWE-522) has been reported. Attackers reach the vulnerable code path via Authorization header.
Check the vendor advisory for the affected versions. Attack surface: Authorization header.
Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
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. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで影響コンポーネントを特定する。
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2Post-deployment verification verify
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。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2026-8368 perl-libwww Fixed in: 6.67-r1
- Debian DEBIAN-CVE-2026-8368 libwww-perl
- Ubuntu UBUNTU-CVE-2026-8368 libwww-perl
References
- advisory metacpan.org
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- patch github.com
- report github.com
- web github.com
- web openwall.com
- web cpan.org