CVE-2026-48858

MEDIUM EPSS 14.2%
Published Jun 10, 20262w ago · Modified Jun 17, 20261w ago
6.3 CVSS 4.0
Medium
Find Similar
Published Jun 10, 2026 2w ago
Last Modified Jun 17, 2026 1w ago

Description

Server-Side Request Forgery (SSRF) vulnerability in Erlang/OTP ftp (ftp_internal module) allows FTP bounce attacks and SSRF via an unvalidated PASV response IP address. The ftp_internal:handle_ctrl_result/2 PASV handler (mode=passive, ipfamily=inet, ftp_extension=false) extracts the IP address from the server's 227 response and passes it directly to gen_tcp:connect/4 without validating it against the control connection peer address. The adjacent EPSV handlers correctly call peername(CSock) to derive the IP from the control connection, but the PASV handler does not. A malicious or compromised FTP server can redirect the client's data connection to an arbitrary internal host and port. On read operations (ftp:ls/1,2, ftp:nlist/1,2, ftp:recv/2,3), data from the redirected target is returned to the caller. On write operations (ftp:send/2,3, ftp:append/2,3), file content is sent to the redirected target. This enables SSRF against internal hosts, cloud metadata endpoints, and FTP bounce attacks against third-party hosts. The vulnerable path is the default configuration (mode=passive, ipfamily=inet, ftp_extension=false). RFC 2577 section 3 explicitly recommends validating the PASV response IP against the control connection peer. The ftp application is deprecated and scheduled for removal in OTP-30. This vulnerability is associated with program files lib/inets/src/ftp/ftp_internal.erl (inets 5.10.4 through 6.5, OTP 17.4 through 20.3) and lib/ftp/src/ftp_internal.erl (ftp 1.0 and later, OTP 21.0 and later). This issue affects OTP from OTP 17.4 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to inets from 5.10.4 before 7.0 and ftp from 1.0 before 1.2.6, 1.2.4.1 and 1.2.3.1.

CVSS Details

Base Score
6.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/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 None
Scope X

Threat Intelligence

EPSS Exploit Probability
14.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-918 Server-Side Request Forgery (SSRF) Validation

Affected Products 7

VendorProductVersionRange
erlangerlang\/inets*≥5.10.4  –  <7.0
erlangerlang\/otp*≥17.4  –  <27.3.4.13
erlangerlang\/otp*≥28.0  –  <28.5.0.2
erlangerlang\/otp*≥29.0  –  <29.0.2
erlangftp*≥1.0  –  <1.2.3.1
erlangftp*≥1.2.4  –  <1.2.4.1
erlangftp*≥1.2.5  –  <1.2.6

References 6

  • cna.erlef.org https://cna.erlef.org/cves/CVE-2026-48858.html
    MitigationThird Party Advisory
  • github.com https://github.com/erlang/otp/commit/2691a806231ffd0490a8a9e20500dec0c7e73727
    Patch
  • github.com https://github.com/erlang/otp/commit/521bcfa24407ee8cb5614823cf905c37ea3aa605
    Patch
  • github.com https://github.com/erlang/otp/security/advisories/GHSA-24cv-hwgr-37fq
    MitigationVendor Advisory
  • osv.dev https://osv.dev/vulnerability/EEF-CVE-2026-48858
    MitigationThird Party Advisory
  • erlang.org https://www.erlang.org/doc/system/versions.html#order-of-versions
    Product

Remediation

  • github.com https://github.com/erlang/otp/commit/2691a806231ffd0490a8a9e20500dec0c7e73727
    Patch
  • github.com https://github.com/erlang/otp/commit/521bcfa24407ee8cb5614823cf905c37ea3aa605
    Patch