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CVE-2026-48856— httpc leaks Authorization header to cross-origin redirect targets

Quick assessment

Affected
Erlang OTP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 5.10至9.7.1之前版本、9.6.2.2版本和9.3.2.6版本存在输入验证错误漏洞，该漏洞源于httpc客户端在重定向时未检查是否跨源边界，将Authorization和Proxy-Authorization请求标头转发给重定向目标，可能导致凭据窃取。

CVSS 7.1 · High EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1539 · Steal Web Session Cookie

Affected Version Matrix 4

VendorProduct Version RangeStatus
Erlang OTP 17.0< * affected
5.10< * affected
84adefa331c4159d432d22840663c38f155cd4c1< 688d748d6f7a6a06b13b662a1d3de8af97079612 affected
688d748d6f7a6a06b13b662a1d3de8af97079612< * unaffected
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I. Basic Information for CVE-2026-48856

Vulnerability Information
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Vulnerability Title
httpc leaks Authorization header to cross-origin redirect targets
Source: CVE Program / CVE List V5
Vulnerability Description
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 OTP 17.0 before OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to inets from 5.10 before 9.3.2.6, 9.6.2.2, and 9.7.1. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Erlang/OTP 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 5.10至9.7.1之前版本、9.6.2.2版本和9.3.2.6版本存在输入验证错误漏洞，该漏洞源于httpc客户端在重定向时未检查是否跨源边界，将Authorization和Proxy-Authorization请求标头转发给重定向目标，可能导致凭据窃取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Erlang OTP 17.0 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 5.10 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 84adefa331c4159d432d22840663c38f155cd4c1 ~ 688d748d6f7a6a06b13b662a1d3de8af97079612 cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-48856

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III. Intelligence Information for CVE-2026-48856

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Patches & Fixes for CVE-2026-48856 (1)

Vendor Advisories for CVE-2026-48856 (3)

Same Patch Batch · Erlang · 2026-06-10 · 7 CVEs total

CVE-2026-49759 8.8 HIGH Stack buffer overflow in SCTP error cause parsing in inet_drv allows remote VM crash
CVE-2026-48860 7.5 HIGH Distribution-over-TLS LAN allowlist silently bypassed due to sockname/peername confusion i
CVE-2026-49760 6.9 MEDIUM Stack Buffer Overflow in ei_s_print_term at Very Large Integer
CVE-2026-48859 6.3 MEDIUM SSH server timing side-channel in ssh_auth:check_password/3 allows unauthenticated usernam
CVE-2026-48858 6.3 MEDIUM ftp client PASV response IP not validated against control peer, enabling SSRF and FTP boun
CVE-2026-48855 2.3 LOW SFTP READLINK Leaks Absolute Backend Filesystem Path When Root Is Configured

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-601

V. Comments for CVE-2026-48856

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