CVE-2026-28810
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 until OTP 28.4.2, 27.3.4.10 and 26.2.5.19 corresponding to kernel from 3.0 until 10.6.2, 10.2.7.4 and 9.2.4.11.
Affected products
1Patches
336f23c9d2cc5b057a9d99501dd15e8eb0354Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
7- github.com/erlang/otp/commit/36f23c9d2cc54afe83671dd7343596d7972839a5nvdPatch
- github.com/erlang/otp/commit/b057a9d995017b1be50d6dc02edd52382f3231b8nvdPatch
- github.com/erlang/otp/commit/dd15e8eb03548c5e55e9915f0e91389ec6bad9fdnvdPatch
- cna.erlef.org/cves/CVE-2026-28810.htmlnvdThird Party Advisory
- github.com/erlang/otp/security/advisories/GHSA-v884-5jg5-whj8nvdVendor Advisory
- osv.dev/vulnerability/EEF-CVE-2026-28810nvdThird Party Advisory
- www.erlang.org/doc/system/versions.htmlnvdRelease Notes
News mentions
0No linked articles in our index yet.