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Erlang/OTP inets EUVDEUVD-2026-36058

| CVE-2026-48856 HIGH
URL Redirection to Untrusted Site (Open Redirect) (CWE-601)
2026-06-10 EEF
Information Disclosure Open Redirect Otp
7.1
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
SUSE
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Jun 10, 2026 - 16:39 vuln.today
Analysis Generated
Jun 10, 2026 - 16:39 vuln.today
CVSS changed
Jun 10, 2026 - 16:22 NVD
7.1 (HIGH)

DescriptionCVE.org

Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data.

The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host.

autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects.

An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header.

This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl.

This issue affects OTP from 17.0 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to inets from 5.10 before 9.7.1, 9.6.2.2 and 9.3.2.6.

AnalysisAI

Credential leakage in Erlang/OTP's inets httpc client (versions 17.0 through 29.0.2, 28.5.0.2, and 27.3.4.13) allows attacker-controlled servers to harvest Authorization and Proxy-Authorization headers by issuing cross-origin 3xx redirects. Because httpc_response:redirect/2 only updates the host field and copies all other headers verbatim - and autoredirect defaults to true - any httpc caller using HTTP Basic auth or URL userinfo silently forwards credentials to the redirect target. No public exploit identified at time of analysis, but the fix has been published upstream and tagged in vendor-released OTP patch versions.

Technical ContextAI

The vulnerable code lives in lib/inets/src/http_client/httpc_response.erl within the OTP inets application, which provides the httpc HTTP client used widely across Erlang and Elixir ecosystems (via :httpc and libraries like hackney's fallbacks, rebar3, and OTP's own update mechanisms). The root cause is CWE-601 (URL Redirection to Untrusted Site / Open Redirect) compounded with sensitive data exposure: when handling a 3xx response, the redirect/2 function builds a new request record by mutating only the host field, leaving authorization, proxy_authorization, cookie, referer, and origin headers intact regardless of whether the new target is on a different origin. RFC 9110 §15.4 explicitly requires stripping these headers on cross-origin redirects, and the patched code now compares Request#request.address against the redirect target and clears the sensitive fields when host or port differ. Credentials passed via URL userinfo (http://user:pass@host) are particularly exposed because httpc_request:handle_user_info/2 transparently converts them into a Basic Authorization header that the caller may not realize is being forwarded.

RemediationAI

Vendor-released patch: upgrade to OTP 29.0.2, 28.5.0.2, or 27.3.4.13 (or equivalently inets 9.7.1, 9.6.2.2, or 9.3.2.6) per the GHSA-m75x-4vwg-ggjh advisory and commit 688d748d6f7a6a06b13b662a1d3de8af97079612. If immediate upgrade is not feasible, explicitly disable automatic redirect following by passing {autoredirect, false} in httpc:request/4-5 HTTPOptions and handle 3xx responses manually in application code - note this changes behavior for any code that relied on transparent redirect following and may require updates to downstream call sites. As an additional compensating control, avoid embedding credentials in URLs (the userinfo form) and avoid sending Authorization headers to URLs sourced from untrusted input; where feasible, route external fetches through an egress proxy that strips Authorization headers on redirects. The Erlang version ordering reference at https://www.erlang.org/doc/system/versions.html#order-of-versions can help confirm whether a deployed build is on or past the fix line.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-36058 vulnerability details – vuln.today
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