NVD / CVE Program· CNA EEF

CVE-2026-32147: SFTP chroot bypass via path traversal in SSH_FXP_FSETSTAT

Noroxi assessment

Priority: Monitor (action score 21/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.35% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Erlang OTP 26.2.5.20, 27.3.4.11, 28.4.3; azl3 erlang 26.2.5.18-1 on Azure Linux 3.0 26.2.5.20-1; cbl2 erlang 25.3.2.21-5 on CBL-Mariner 2.0 Release Notes.

Low priority for now. Upgrade to Erlang OTP 26.2.5.20, 27.3.4.11, 28.4.3; azl3 erlang 26.2.5.18-1 on Azure Linux 3.0 26.2.5.20-1; cbl2 erlang 25.3.2.21-5 on CBL-Mariner 2.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Erlang OTP ssh (ssh_sftpd module) allows an authenticated SFTP user to modify file attributes outside the configured chroot directory. The SFTP daemon (ssh_sftpd) stores the raw, user-supplied path in file handles instead of the chroot-resolved path. When SSH_FXP_FSETSTAT is issued on such a handle, file attributes (permissions, ownership, timestamps) are modified on the real filesystem path, bypassing the root directory boundary entirely. Any authenticated SFTP user on a server configured with the root option can modify file attributes of files outside the intended chroot boundary. The prerequisite is that a target file must exist on the real filesystem at the same relative path. Note that this vulnerability only allows modification of file attributes; file contents cannot be read or altered through this attack vector. If the SSH daemon runs as root, this enables direct privilege escalation: an attacker can set the setuid bit on any binary, change ownership of sensitive files, or make system configuration world-writable. This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl and program routines ssh_sftpd:do_open/4 and ssh_sftpd:handle_op/4. This issue affects OTP from OTP 17.0 before OTP 28.4.3, OTP 27.3.4.11 and OTP 26.2.5.20, corresponding to ssh from 3.0.1 before 5.5.3, 5.2.11.7 and 5.1.4.15.

MediumCVSS 5.3 · v4.0—No exploit Fix available

Path traversal

Published: Apr 21, 2026
Updated: Oct 26, 2026
EPSS: 0.3% · 28th percentile
CWE: CWE-22

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 21 / 40 · 5.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · EEF: 5.3; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
erlang	erlang/otp	cpe:2.3:a:erlang:erlang/otp
erlang	erlang/ssh	cpe:2.3:a:erlang:erlang/ssh

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

erlang erlang/otp17.0 and later · before 26.2.5.20
erlang erlang/otp27.0 and later · before 27.3.4.11
erlang erlang/otp28.0 and later · before 28.4.3
erlang erlang/ssh3.0.1 and later · before 5.1.4.15
erlang erlang/ssh5.2 and later · before 5.2.11.7
erlang erlang/ssh5.5 and later · before 5.5.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (EEF). Independent of NVD's CPE analysis and usually ahead of it.

Erlang OTP
- 3.01 and lateraffected · otpfixed in 5.5.3, 5.2.11.7, 5.1.4.15
- 17.0 and lateraffected · otpfixed in 28.4.3, 27.3.4.11, 26.2.5.20
- 07b8f441ca711f9812fad9e9115bab3c3aa92f79 and lateraffected · gitfixed in 28c5d5a6c5f873dc701b597276271763e7d1c004

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	erlang	from 0	—
Debian:13	erlang	before 1:27.3.4.1+dfsg-1+deb13u3	1:27.3.4.1+dfsg-1+deb13u3
Debian:14	erlang	before 1:27.3.4.11+dfsg-1	1:27.3.4.11+dfsg-1
openSUSE:Leap 16.0	erlang	before 27.1.3-160000.5.1	27.1.3-160000.5.1
openSUSE:Tumbleweed	erlang27	before 27.1.3-2.1	27.1.3-2.1
SUSE:Linux Enterprise Module for Server Applications 15 SP7	erlang	before 23.3.4.19-150300.3.42.1	23.3.4.19-150300.3.42.1
SUSE:Linux Enterprise Server 16.0	erlang	before 27.1.3-160000.5.1	27.1.3-160000.5.1

Same product

erlang: all records

Other highest-scoring records for the same primary product.

CVE-2026-55953TLS 1.2 and DTLS client accepts unoffered anonymous cipher suite, bypassing server authentication
36Monitor
CVE-2026-49759Stack buffer overflow in SCTP error cause parsing in inet_drv allows remote VM crash
35Monitor
CVE-2026-59251Denial of service via exponential certificate policy tree growth in path validation
34Monitor

Published before and after this one in the same product

← EarlierCVE-2026-28810Apr 7, 2026 · Predictable DNS Transaction IDs Enable Cache Poisoning in Built-in Resolver
25Monitor
← EarlierCVE-2026-32144Apr 7, 2026 · OCSP designated-responder authorization bypass via missing signature verification
30Monitor
Later →CVE-2026-42789May 27, 2026 · Non-CA certificate accepted as intermediate issuer in public_key path validation
28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Erlang OTP	26.2.5.20	Vendor (CNA)
Erlang OTP	27.3.4.11	Vendor (CNA)
Erlang OTP	28.4.3	Vendor (CNA)
Erlang OTP	28c5d5a6c5f873dc701b597276271763e7d1c004	Vendor (CNA)
Erlang OTP	5.1.4.15	Vendor (CNA)
Erlang OTP	5.2.11.7	Vendor (CNA)
Erlang OTP	5.5.3	Vendor (CNA)
azl3 erlang 26.2.5.18-1 on Azure Linux 3.0	26.2.5.20-1 · CBL-Mariner Releases	Microsoft (MSRC)
cbl2 erlang 25.3.2.21-5 on CBL-Mariner 2.0	Release Notes	Microsoft (MSRC)
debian:erlang	1:27.3.4.1+dfsg-1+deb13u3 · Debian:13	Package registry (OSV)
opensuse:erlang	27.1.3-160000.5.1 · openSUSE:Leap 16.0	Package registry (OSV)
opensuse:erlang27	27.1.3-2.1 · openSUSE:Tumbleweed	Package registry (OSV)
suse:erlang	27.1.3-160000.5.1 · SUSE:Linux Enterprise Server 16.0	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

erlang/otpcommit 28c5d5a

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

John Downeyfinder
Jakub Witczakremediation reviewer
Michał Wąsowskiremediation developer

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: X

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/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

nvd-secondary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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References

cna.erlef.org/cves/CVE-2026-32147.html

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records