USN-8632-1: follow-redirects vulnerability

unknownCVE-2026-40895

Dennis Sepede discovered that follow-redirects did not properly remove custom authentication headers when following cross-domain redirects. An attacker could possibly use this issue to obtain sensitive authentication information, resulting in credential disclosure.

CSIRTS triage

vendor: follow-redirects product: follow-redirects Authentication bypass Information disclosure

What: follow-redirects fails to remove custom authentication headers when following cross-domain redirects, leaking credentials across domains.
Who is affected: Applications using follow-redirects for HTTP redirect handling.
Urgency: Credential disclosure is serious and could be exploited by network attackers; remediation should be prioritized.
Action: Update follow-redirects to a patched version that properly strips authentication headers on cross-domain redirects.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-12
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8632-1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-408950.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-40895	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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