CVE-2026-7017
HTTP::Tiny versions before 0.095 for Perl forward credential headers to cross-origin redirect targets.
When the server returns a 3xx redirect, _maybe_redirect follows the Location: header and _prepare_headers_and_cb re-merges the caller's headers argument into the new request, without checking whether the redirect target shares an origin with the original URL. Caller-supplied Authorization, Cookie and Proxy-Authorization headers are therefore re-sent to whatever host the redirect names, across scheme, host or port boundaries, and including https to http downgrades that expose them in plaintext on the wire.
The HTTP::Tiny POD note that "Authorization headers will not be included in a redirected request" applied only to the URL-userinfo Basic-auth path, not to headers passed explicitly by the caller.
CSIRTS triage
- What
- Multiple vulnerabilities including unsafe handling of Socket/pack functions leading to memory disclosure, regex matching errors, denial-of-service issues in file handling, and arbitrary code execution.
- Who is affected
- Systems running Perl with the affected functions in use, impacting a broad set of deployments.
- Urgency
- Multiple severity levels across the CVEs; RCE capability (CVE-2026-48962) requires immediate attention.
- Action
- Apply the Ubuntu security update USN-8684-1 or equivalent patches for your Perl installation.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-7017
Get an email if CVE-2026-7017 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all EPSS-scored CVEs.
Advisory coverage (2)
- unknownUSN-8684-1: Perl vulnerabilitiesubuntu · 2026-08-27
- highCVE-2026-7017: HTTP::Tiny versions before 0.095 for Perl forward credential headers to cross-origin redirect t…nvd · 2026-07-07
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-7017)