Home/CVE/Generation of Predictable Numbers or Identifiers vulnerability in Erlang/OTP kernel (inet_res, inet_db modules) allows D
CVE

CVE-2026-28810

Generation of Predictable Numbers or Identifiers vulnerability in Erlang/OTP kernel (inet_res, inet_db modules) allows D

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.

LOW · CVSS 3.7 EPSS 0.00047
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-340Generation of Predictable Numbers or Identifiers
▤

Affected Products & Versions

3
erlang erlang\/otp>= 17.0 and < 26.2.5.19
erlang erlang\/otp>= 27.0 and < 27.3.4.10
erlang erlang\/otp>= 28.0 and < 28.4.2
▣

Scoring & Timeline

3.7
LOW · CVSS v3.1 · 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 Apr 2026 · 09:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

3
msrcCVE-2026-28810
suse-csafopenSUSE-SU-2026:20607-1
suse-csafSUSE-SU-2026:21374-1
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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
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