Description
Generation of Predictable Numbers or Identifiers vulnerability in Erlang/OTP kernel (inet_res, inet_db modules) allows DNS Cache Poisoning.
The built-in DNS resolver (inet_res) uses a sequential, process-global 16-bit transaction ID for UDP queries and does not implement source port randomization. Response validation relies almost entirely on this ID, making DNS cache poisoning practical for an attacker who can observe one query or predict the next ID. This conflicts with RFC 5452 recommendations for mitigating forged DNS answers.
inet_res is intended for use in trusted network environments and with trusted recursive resolvers. Earlier documentation did not clearly state this deployment assumption, which could lead users to deploy the resolver in environments where spoofed DNS responses are possible.
This vulnerability is associated with program files lib/kernel/src/inet_db.erl and lib/kernel/src/inet_res.erl.
This issue affects OTP from OTP 17.0 before OTP 26.2.5.19, OTP 27.3.4.10, and OTP 28.4.2, corresponding to kernel from 3.0 before 9.2.4.11, 10.2.7.4, and 10.6.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Erlang | OTP | 17.0, 3.0 | — |
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 | 1:27.3.4.10+dfsg-1 | — |
| Debian 13 | erlang | 1:27.3.4.1+dfsg-1+deb13u3 | — |
| Debian 12 | erlang | No fix yet | — |
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 | No fix yet | — |
| Ubuntu 24.04 LTS | erlang | 1:25.3.2.8+dfsg-1ubuntu4.8 | USN-8901-1 |
| Ubuntu 22.04 LTS | erlang | 1:24.2.1+dfsg-1ubuntu0.8 | USN-8901-1 |
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 SP7 | erlang | 23.3.4.19-150300.3.39.1 | SUSE-SU-2026:3645-1 |
| SLES 15 SP7 | erlang26 | 26.2.1-150300.7.28.1 | SUSE-SU-2026:3579-1 |
| SLES 15 SP6 | erlang | 23.3.4.19-150300.3.39.1 | SUSE-SU-2026:3645-1 |
| SLES 15 SP6 | erlang26 | 26.2.1-150300.7.28.1 | SUSE-SU-2026:3579-1 |
| SLES 15 SP5 | erlang | 23.3.4.19-150300.3.39.1 | SUSE-SU-2026:3645-1 |
| SLES 15 SP4 | erlang | 23.3.4.19-150300.3.39.1 | SUSE-SU-2026:3645-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | erlang | 23.3.4.19-150300.3.39.1 | SUSE-SU-2026:3645-1 |
| SLES for SAP 15 SP6 | erlang26 | 26.2.1-150300.7.28.1 | SUSE-SU-2026:3579-1 |
| SLES for SAP 15 SP5 | erlang | 23.3.4.19-150300.3.39.1 | SUSE-SU-2026:3645-1 |
| SLES for SAP 15 SP4 | erlang | 23.3.4.19-150300.3.39.1 | SUSE-SU-2026:3645-1 |
| SLE HPC 15 SP5 | erlang | 23.3.4.19-150300.3.39.1 | SUSE-SU-2026:3645-1 |
| SLE HPC 15 SP4 | erlang | 23.3.4.19-150300.3.39.1 | SUSE-SU-2026:3645-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | erlang27 | 27.1.3-2.1 | openSUSE-SU-2026:10947-1 |
| openSUSE Leap 16.0 | erlang | 27.1.3-160000.4.1 | openSUSE-SU-2026:20607-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | No fix yet | — |
Advisories 6
- USN-8901-1 erlang vulnerabilities Ubuntu Security Notices (USN) · Oct 8, 2026
- WID-SEC-2026-0998 Erlang/OTP: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 24, 2026
- SUSE-SU-2026:3645-1 Security update for erlang SUSE / openSUSE Security Updates · Aug 21, 2026
- SUSE-SU-2026:3579-1 Security update for erlang26 SUSE / openSUSE Security Updates · Aug 12, 2026
- openSUSE-SU-2026:10947-1 erlang27-27.1.3-2.1 on GA media SUSE / openSUSE Security Updates · Jun 4, 2026
- openSUSE-SU-2026:20607-1 Security update for erlang SUSE / openSUSE Security Updates · Apr 24, 2026
References
- Predictable DNS Transaction IDs Enable Cache Poisoning in Built-in Resolver vendor-advisory related
- EEF CNA record for CVE-2026-28810 related
- OSV record EEF-CVE-2026-28810 related
- Erlang/OTP version ordering
- Introducing commit 07b8f44 in erlang/otp related
- Fix commit b057a9d in erlang/otp patch
- Fix commit dd15e8e in erlang/otp patch
- Fix commit 36f23c9 in erlang/otp patch