CVE-2026-49759: Stack-based Buffer Overflow vulnerability in Erlang OTP erts (inet_drv) allows an unauthenticated remote attac

This month

HIGH 8.2REMOTEUPGRADEUPGRADE

CVE-2026-49759 is a high-severity flaw (CVSS 8.2) affecting erlang\/otp, erts. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based Buffer Overflow vulnerability in Erlang OTP erts (inet_drv) allows an unauthenticated remote attacker to crash the BEAM VM by sending a crafted SCTP ERROR chunk. The sctp_parse_error_chunk function in erts/emulator/drivers/common/inet_drv.c parses SCTP ERROR chunks and writes cause codes into a fixed-size stack-allocated ErlDrvTermData spec[] array without checking bounds. A remote attacker who has established an SCTP association to

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-121, CWE-120
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: >= 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 erts UPGRADE

Affected: >= 6.0 and < 15.2.7.9 · >= 16.0 and < 16.4.0.2 · >= 17.0 and < 17.0.2

Fixed in: 15.2.7.9, 16.4.0.2, 17.0.2

Safe to downgrade to: a release before 6.0

1. Check installed version

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

2. UPGRADE to 15.2.7.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade erts

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 6.0 (Debian / Ubuntu)

apt-cache madison erts sudo apt install erts=<VERSION_BEFORE_6.0> sudo apt-mark hold erts

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

dnf --showduplicates list erts sudo dnf downgrade erts-<VERSION_BEFORE_6.0> sudo dnf versionlock add erts

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-2026-49759?

erlang\/otp: upgrade to 27.3.4.13, 28.5.0.2, 29.0.2; erts: upgrade to 15.2.7.9, 16.4.0.2, 17.0.2. Exact commands for each OS are on this page.

Is CVE-2026-49759 being exploited?

CVE-2026-49759 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-2026-49759 affect?

CVE-2026-49759 affects erlang\/otp, erts. Severity is high (CVSS 8.2). Stack-based Buffer Overflow vulnerability in Erlang OTP erts (inet_drv) allows an unauthenticated remote attacker to crash the BEAM VM by sending a crafted SCTP ERROR chunk. The sctp_parse_error_chunk function in erts/emulator/drivers/comm

How urgent is CVE-2026-49759?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-42790 HIGH 8.1 UPGRADE Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_cert and public_key modules) al
CVE-2026-48859 MEDIUM 5.3 UPGRADE UPGRADE Observable Timing Discrepancy vulnerability in Erlang/OTP ssh (ssh_auth, ssh_options modules) allows unauthent
CVE-2026-42789 MEDIUM 4.8 UPGRADE Improper Following of a Certificate's Chain of Trust vulnerability in Erlang OTP public_key (pubkey_cert modul
CVE-2026-48856 MEDIUM 6.5 UPGRADE UPGRADE Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sen
CVE-2026-48860 MEDIUM 6.5 UPGRADE UPGRADE Reliance on IP Address for Authentication vulnerability in Erlang/OTP ssl (inet_tls_dist module) allows unauth

References

← Back to latest CVEs