Description
Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.1, 26.2.5.10, and 25.3.2.19, a maliciously formed KEX init message can result with high memory usage. Implementation does not verify RFC specified limits on algorithm names (64 characters) provided in KEX init message. Big KEX init packet may lead to inefficient processing of the error data. As a result, large amount of memory will be allocated for processing malicious data. Versions OTP-27.3.1, OTP-26.2.5.10, and OTP-25.3.2.19 fix the issue. Some workarounds are available. One may set option `parallel_login` to `false` and/or reduce the `max_sessions` option.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| erlang | otp | < OTP-27.3.1, < OTP-26.2.5.10, < OTP-25.3.2.19 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | erlang | 1:27.3.1+dfsg-1 | — |
| Debian 13 | erlang | 1:27.3.1+dfsg-1 | — |
| Debian 12 | erlang | 1:25.2.3+dfsg-1+deb12u1 | DSA-5906-1 |
| Debian 11 | erlang | 1:23.2.6+dfsg-1+deb11u2 | DLA-4132-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | erlang | 1:27.3.4.6+dfsg-1ubuntu0.2 | USN-8901-1 |
| Ubuntu 25.10 | erlang | 1:27.3+dfsg-1ubuntu1 | — |
| Ubuntu 24.04 LTS | erlang | 1:25.3.2.8+dfsg-1ubuntu4.2 | USN-8901-1, USN-7425-1 |
| Ubuntu 22.04 LTS | erlang | 1:24.2.1+dfsg-1ubuntu0.3 | USN-8901-1, USN-7425-1 |
| Ubuntu 20.04 LTS | erlang | 1:22.2.7+dfsg-1ubuntu0.4 | USN-7425-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | erlang | 1:22.2.7+dfsg-1ubuntu0.5+esm3 | USN-8901-1 |
| Ubuntu Pro 18.04 LTS | erlang | 1:20.2.2+dfsg-1ubuntu2+esm4 | USN-8901-1 |
| Ubuntu Pro 16.04 LTS | erlang | 1:18.3-dfsg-1ubuntu3.1+esm4 | USN-8901-1 |
| Ubuntu Pro 14.04 LTS | erlang | 1:16.b.3-dfsg-1ubuntu2.2+esm3 | USN-8901-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | erlang26 | 26.2.1-150300.7.11.1 | SUSE-SU-2025:1356-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | erlang26 | 26.2.1-150300.7.11.1 | SUSE-SU-2025:1356-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | erlang | 26.2.5.10-1 | — |
| Azure Linux 2 (CBL-Mariner) | erlang | 25.3.2.20-1 | — |
Advisories 6
- USN-8901-1 erlang vulnerabilities Ubuntu Security Notices (USN) · Oct 8, 2026
- USN-7425-1 erlang vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5906-1 erlang - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4132-1 erlang - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:1356-1 Security update for erlang26 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0657 Erlang/OTP: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Apr 22, 2025