CVE-2026-28810
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
Vulnerability in Erlang/OTP DNS module (inet_res, inet_db) allows DNS cache poisoning. It uses a sequential, process-global 16-bit transaction ID without source port randomization, making it easy for an attacker to predict the ID and inject forged responses.
Risk Assessment
An attacker can redirect DNS traffic to malicious servers, leading to data interception or phishing. Risk is especially high when the DNS resolver is used outside a trusted network.
Recommendation
Update Erlang/OTP to version 28.4.2, 27.3.4.10, or 26.2.5.19 (kernel 10.6.2, 10.2.7.4, or 9.2.4.11). Consider using an external DNS resolver with port randomization.
Original NVD description (English source)
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 28.4.2, OTP 27.3.4.10 and OTP 26.2.5.19, corresponding to kernel from 3.0 before 10.6.2, 10.2.7.4 and 9.2.4.11.