CVE-2026-48858: Server-Side Request Forgery (SSRF) vulnerability in Erlang/OTP ftp (ftp_internal module) allows FTP bounce att

Routine

MEDIUM 6.5REMOTEUPGRADEUPGRADEUPGRADE

CVE-2026-48858 is a medium-severity flaw (CVSS 6.5) affecting erlang\/inets, erlang\/otp, ftp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-918
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\/inets UPGRADE

Affected: >= 5.10.4 and < 7.0

Fixed in: 7.0

Safe to downgrade to: a release before 5.10.4

1. Check installed version

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

2. UPGRADE to 7.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade erlanginets

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 5.10.4 (Debian / Ubuntu)

apt-cache madison erlanginets sudo apt install erlanginets=<VERSION_BEFORE_5.10.4> sudo apt-mark hold erlanginets

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

dnf --showduplicates list erlanginets sudo dnf downgrade erlanginets-<VERSION_BEFORE_5.10.4> sudo dnf versionlock add erlanginets

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\/otp UPGRADE

Affected: >= 17.4 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 17.4

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 17.4 (Debian / Ubuntu)

apt-cache madison erlangotp sudo apt install erlangotp=<VERSION_BEFORE_17.4> 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_17.4> 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 ftp UPGRADE

Affected: >= 1.0 and < 1.2.3.1 · >= 1.2.4 and < 1.2.4.1 · >= 1.2.5 and < 1.2.6

Fixed in: 1.2.3.1, 1.2.4.1, 1.2.6

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. UPGRADE to 1.2.3.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ftp

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 1.0 (Debian / Ubuntu)

apt-cache madison ftp sudo apt install ftp=<VERSION_BEFORE_1.0> sudo apt-mark hold ftp

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

dnf --showduplicates list ftp sudo dnf downgrade ftp-<VERSION_BEFORE_1.0> sudo dnf versionlock add ftp

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-2026-48858?

erlang\/inets: upgrade to 7.0; erlang\/otp: upgrade to 27.3.4.13, 28.5.0.2, 29.0.2; ftp: upgrade to 1.2.3.1, 1.2.4.1, 1.2.6. Exact commands for each OS are on this page.

Is CVE-2026-48858 being exploited?

CVE-2026-48858 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-2026-48858 affect?

CVE-2026-48858 affects erlang\/inets, erlang\/otp, ftp. Severity is medium (CVSS 6.5). 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, ipfa

How urgent is CVE-2026-48858?

Priority 31/100. Remotely exploitable, no login, no user action

References

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