DEBIAN-CVE-2026-53422

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Source

https://security-tracker.debian.org/tracker/CVE-2026-53422

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53422.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-53422

Upstream

CVE-2026-53422

Published

2026-07-02T17:17:01Z

Modified

2026-09-14T17:03:45Z

Severity

4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS Calculator

Summary

[none]

Details

Observable Response Discrepancy vulnerability in Erlang OTP ssh (ssh_sftpd module) allows an authenticated SFTP user to enumerate the existence of files and directories outside the configured root directory. The SSH_FXP_REALPATH handler in ssh_sftpd calls relate_file_name/3 with Canonicalize=false, unlike every other SFTP operation handler. This allows .. components in the requested path to bypass the is_within_root/2 check without being resolved. The un-canonicalized path then enters resolve_symlinks/2, which walks up the directory tree above the configured root and issues read_link() syscalls on arbitrary filesystem paths. An authenticated SFTP client can exploit this by sending a REALPATH request with a crafted traversal path. The server response differs depending on whether the target path exists on the host filesystem (SSH_FXP_NAME when the path resolves successfully, SSH_FX_NO_SUCH_FILE when it does not). This creates a path-existence oracle that an attacker can use to enumerate the filesystem structure outside the configured root, including the existence of sensitive files, directories, and mount points. The vulnerability leaks only the existence of paths. No file contents, credentials, or write access are obtainable through this issue alone. The information gained may assist further attacks when combined with other vulnerabilities. This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl and program routine ssh_sftpd:handle_op/4. This issue affects OTP from OTP 17.0 before OTP 29.0.3, OTP 28.5.0.3 and OTP 27.3.4.14, corresponding to ssh from 3.0.1 before 6.0.2, 5.5.2.2 and 5.2.11.9.

References

https://security-tracker.debian.org/tracker/CVE-2026-53422

Affected packages

Debian:12 / erlang

Package

Name: erlang
Purl: pkg:deb/debian/erlang?arch=source&distro=bookworm

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1:25.*

1:25.2.3+dfsg-1

1:25.2.3+dfsg-1+deb12u1

1:25.2.3+dfsg-1+deb12u2

1:25.2.3+dfsg-1+deb12u3

1:25.2.3+dfsg-1+deb12u4

1:25.3.2.8+dfsg-1

1:25.3.2.10+dfsg-1

1:25.3.2.10+dfsg-2

1:25.3.2.11+dfsg-1

1:25.3.2.12+dfsg-1

1:25.3.2.12+dfsg-2

1:25.3.2.12+dfsg-3

1:26.*

1:26.0~rc2+dfsg-1

1:26.0~rc3+dfsg-1

1:26.0+dfsg-1

1:26.0.1+dfsg-1

1:26.0.2+dfsg-1

1:26.1.2+dfsg-1

1:26.2.1+dfsg-1

1:26.2.4+dfsg-1

1:27.*

1:27.0~rc3+dfsg-1

1:27.0~rc3+dfsg-2

1:27.0~rc3+dfsg-3

1:27.0~rc3+dfsg-4

1:27.0+dfsg-1

1:27.0.1+dfsg-1

1:27.0.1+dfsg-2

1:27.0.1+dfsg-3

1:27.1.2+dfsg-1

1:27.2+dfsg-1

1:27.2+dfsg-2

1:27.2+dfsg-3~exp1

1:27.2.1+dfsg-1

1:27.2.1+dfsg-2

1:27.2.2+dfsg-1

1:27.2.3+dfsg-1

1:27.2.4+dfsg-1

1:27.3+dfsg-1

1:27.3.1+dfsg-1

1:27.3.2+dfsg-1

1:27.3.3+dfsg-1

1:27.3.4+dfsg-1

1:27.3.4.1+dfsg-1

1:27.3.4.3+dfsg-1

1:27.3.4.4+dfsg-1

1:27.3.4.6+dfsg-1

1:27.3.4.8+dfsg-1

1:27.3.4.9+dfsg-1

1:27.3.4.10+dfsg-1

1:27.3.4.11+dfsg-1

1:27.3.4.11+dfsg-2

1:27.3.4.11+dfsg-3

1:27.3.4.11+dfsg-4

1:27.3.4.11+dfsg-5

1:27.3.4.11+dfsg-6

1:27.3.4.11+dfsg-7

1:27.3.4.12+dfsg-1

1:28.*

1:28.0+dfsg-1

1:28.0.1+dfsg-1

1:28.0.2+dfsg-1

1:28.0.4+dfsg-1

1:28.1.1+dfsg-1

1:28.2+dfsg-1

1:28.3+dfsg-1

1:28.3.1+dfsg-1

1:29.*

1:29.0~rc1+dfsg-1

1:29.0~rc1+dfsg-2

1:29.0~rc2+dfsg-1

1:29.0~rc3+dfsg-1

1:29.0~rc3+dfsg-2

1:29.0~rc3+dfsg-3

1:29.0~rc3+dfsg-4

1:29.0+dfsg-1

1:29.0+dfsg-2

1:29.0.1+dfsg-1

1:29.0.2+dfsg-1

1:29.0.3+dfsg-1

1:29.0.4+dfsg-1

1:29.0.6+dfsg-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53422.json"

Debian:13 / erlang

Package

Name: erlang
Purl: pkg:deb/debian/erlang?arch=source&distro=trixie

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1:27.3.4.1+dfsg-1+deb13u3

Affected versions

1:27.*

1:27.3.4.1+dfsg-1

1:27.3.4.1+dfsg-1+deb13u1

1:27.3.4.1+dfsg-1+deb13u2

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53422.json"

Debian:14 / erlang

Package

Name: erlang
Purl: pkg:deb/debian/erlang?arch=source&distro=forky

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1:29.0.3+dfsg-1

Affected versions

1:27.*

1:27.3.4.1+dfsg-1

1:27.3.4.3+dfsg-1

1:27.3.4.4+dfsg-1

1:27.3.4.6+dfsg-1

1:27.3.4.8+dfsg-1

1:27.3.4.9+dfsg-1

1:27.3.4.10+dfsg-1

1:27.3.4.11+dfsg-1

1:27.3.4.11+dfsg-2

1:27.3.4.11+dfsg-3

1:27.3.4.11+dfsg-4

1:27.3.4.11+dfsg-5

1:27.3.4.11+dfsg-6

1:27.3.4.11+dfsg-7

1:27.3.4.12+dfsg-1

1:28.*

1:28.0+dfsg-1

1:28.0.1+dfsg-1

1:28.0.2+dfsg-1

1:28.0.4+dfsg-1

1:28.1.1+dfsg-1

1:28.2+dfsg-1

1:28.3+dfsg-1

1:28.3.1+dfsg-1

1:29.*

1:29.0~rc1+dfsg-1

1:29.0~rc1+dfsg-2

1:29.0~rc2+dfsg-1

1:29.0~rc3+dfsg-1

1:29.0~rc3+dfsg-2

1:29.0~rc3+dfsg-3

1:29.0~rc3+dfsg-4

1:29.0+dfsg-1

1:29.0+dfsg-2

1:29.0.1+dfsg-1

1:29.0.2+dfsg-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53422.json"