CVE-2026-48855: Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module)

Routine

MEDIUM 6.5UPGRADEUPGRADE

CVE-2026-48855 is a medium-severity flaw (CVSS 6.5) affecting erlang\/otp, erlang\/ssh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module) allows File Discovery. The SSH_FXP_READLINK handler in ssh_sftpd sends the raw result of file:read_link/2 to the client without calling chroot_filename/2 to strip the backend root prefix. An authenticated SFTP client can create a symlink inside the chroot pointing to /; ssh_sftpd resolves the target to the absolute backend root and store

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-06-10
Last modified	2026-10-25

Publisher (CNA): EEF · Vendor: erlang

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-10 16:17 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

erlang erlang\/otp UPGRADE

Affected: >= 17.0 and < 27.3.4.13 · >= 28.0 and < 28.5.0.2 · >= 29.0 and < 29.0.2

Fixed in: 27.3.4.13, 28.5.0.2, 29.0.2

Safe to downgrade to: a release before 17.0

1. Check installed version

apt-cache policy erlangotp || rpm -q erlangotp || erlangotp --version

2. UPGRADE to 27.3.4.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade erlangotp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade erlangotp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 17.0 (Debian / Ubuntu)

apt-cache madison erlangotp sudo apt install erlangotp=<VERSION_BEFORE_17.0> sudo apt-mark hold erlangotp

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list erlangotp sudo dnf downgrade erlangotp-<VERSION_BEFORE_17.0> sudo dnf versionlock add erlangotp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

erlang erlang\/ssh UPGRADE

Affected: >= 3.0.1 and < 5.2.11.8 · >= 5.5 and < 5.5.2.1 · >= 6.0 and < 6.0.1

Fixed in: 5.2.11.8, 5.5.2.1, 6.0.1

Safe to downgrade to: a release before 3.0.1

1. Check installed version

apt-cache policy erlangssh || rpm -q erlangssh || erlangssh --version

2. UPGRADE to 5.2.11.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade erlangssh

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade erlangssh

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.0.1 (Debian / Ubuntu)

apt-cache madison erlangssh sudo apt install erlangssh=<VERSION_BEFORE_3.0.1> sudo apt-mark hold erlangssh

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list erlangssh sudo dnf downgrade erlangssh-<VERSION_BEFORE_3.0.1> sudo dnf versionlock add erlangssh

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-48855?

erlang\/otp: upgrade to 27.3.4.13, 28.5.0.2, 29.0.2; erlang\/ssh: upgrade to 5.2.11.8, 5.5.2.1, 6.0.1. Exact commands for each OS are on this page.

Is CVE-2026-48855 being exploited?

CVE-2026-48855 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-48855 affect?

CVE-2026-48855 affects erlang\/otp, erlang\/ssh. Severity is medium (CVSS 6.5). Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module) allows File Discovery. The SSH_FXP_READLINK handler in ssh_sftpd sends the raw result of file:read_link/2 to the client without c

How urgent is CVE-2026-48855?

Priority 28/100. No elevated risk signals yet.

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References

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