CVE-2026-48860: Reliance on IP Address for Authentication vulnerability in Erlang/OTP ssl (inet_tls_dist module) allows unauth

Routine

MEDIUM 6.5UPGRADEUPGRADE

CVE-2026-48860 is a medium-severity flaw (CVSS 6.5) affecting erlang\/otp, erlang\/ssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Reliance on IP Address for Authentication vulnerability in Erlang/OTP ssl (inet_tls_dist module) allows unauthenticated bypass of the distribution-over-TLS LAN allowlist. The inet_tls_dist:check_ip/1 function, which enforces a LAN allowlist for Erlang distribution over TLS, calls inet:sockname/1 instead of inet:peername/1 to obtain the peer's IP address. Because inet:sockname/1 returns the local socket address, both the local IP and the supposed

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	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-863, CWE-1025
Published	2026-06-10
Last modified	2026-10-26

Publisher (CNA): EEF · Vendor: erlang

Last updated 2026-10-26 · 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
2026-10-26 11:10 UTCUpdated Record last modified

erlang erlang\/otp UPGRADE

Affected: >= 26.0 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 26.0

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 26.0 (Debian / Ubuntu)

apt-cache madison erlangotp sudo apt install erlangotp=<VERSION_BEFORE_26.0> 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_26.0> 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\/ssl UPGRADE

Affected: >= 11.0 and < 11.2.12.9 · >= 11.6 and < 11.6.0.2 · >= 11.7 and < 11.7.2

Fixed in: 11.2.12.9, 11.6.0.2, 11.7.2

Safe to downgrade to: a release before 11.0

1. Check installed version

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

2. UPGRADE to 11.2.12.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade erlangssl

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 11.0 (Debian / Ubuntu)

apt-cache madison erlangssl sudo apt install erlangssl=<VERSION_BEFORE_11.0> sudo apt-mark hold erlangssl

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

dnf --showduplicates list erlangssl sudo dnf downgrade erlangssl-<VERSION_BEFORE_11.0> sudo dnf versionlock add erlangssl

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-2026-48860?

erlang\/otp: upgrade to 27.3.4.13, 28.5.0.2, 29.0.2; erlang\/ssl: upgrade to 11.2.12.9, 11.6.0.2, 11.7.2. Exact commands for each OS are on this page.

Is CVE-2026-48860 being exploited?

CVE-2026-48860 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-2026-48860 affect?

CVE-2026-48860 affects erlang\/otp, erlang\/ssl. Severity is medium (CVSS 6.5). Reliance on IP Address for Authentication vulnerability in Erlang/OTP ssl (inet_tls_dist module) allows unauthenticated bypass of the distribution-over-TLS LAN allowlist. The inet_tls_dist:check_ip/1 function, which enforces a LAN allowlis

How urgent is CVE-2026-48860?

Priority 26/100. No elevated risk signals yet.

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References

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