Vulnerability 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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Erlang | Erlang\/Otp | >= 17.0, < 26.2.5.19 |
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-28810.htmlThird Party Advisory
- https://github.com/erlang/otp/commit/36f23c9d2cc54afe83671dd7343596d7972839a5Patch
- https://github.com/erlang/otp/commit/b057a9d995017b1be50d6dc02edd52382f3231b8Patch
- https://github.com/erlang/otp/commit/dd15e8eb03548c5e55e9915f0e91389ec6bad9fdPatch
- https://github.com/erlang/otp/security/advisories/GHSA-v884-5jg5-whj8Vendor Advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-28810Third Party Advisory
- https://www.erlang.org/doc/system/versions.html#order-of-versionsRelease Notes
FAQ
What is CVE-2026-28810?
CVE-2026-28810 is a vulnerability with a CVSS score of 3.7 (LOW). 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, pro...
How severe is CVE-2026-28810?
CVE-2026-28810 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-28810?
Check the references section above for vendor advisories and patch information. Affected products include: Erlang Erlang\/Otp.