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Otp CVE-2026-28810

| EUVDEUVD-2026-19582 MEDIUM
Generation of Predictable Numbers or Identifiers (CWE-340)
2026-04-07 EEF
Information Disclosure Otp Erlang
6.3
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
SUSE
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
EUVD ID Assigned
Apr 07, 2026 - 08:30 euvd
EUVD-2026-19582
Analysis Generated
Apr 07, 2026 - 08:30 vuln.today
Patch released
Apr 07, 2026 - 08:30 nvd
Patch available
CVE Published
Apr 07, 2026 - 07:50 nvd
MEDIUM 6.3

DescriptionCVE.org

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.

AnalysisAI

Erlang/OTP kernel inet_res DNS resolver uses predictable sequential transaction IDs and lacks source port randomization, enabling DNS cache poisoning attacks against systems relying on this resolver in untrusted network environments. Affects OTP 17.0 through 28.4.2 (and specific patch versions 27.3.4.10, 26.2.5.19); unauthenticated remote attackers who can observe or predict DNS query patterns can forge DNS responses to redirect traffic or execute man-in-the-middle attacks. Vendor-released patches available; no public exploit code or active exploitation confirmed.

Technical ContextAI

The Erlang/OTP built-in DNS resolver (inet_res module in lib/kernel/src) implements RFC 1035 DNS over UDP but violates RFC 5452 mitigations against forged DNS answers. The vulnerability stems from CWE-340 (Generation of Predictable Numbers or Identifiers) in the transaction ID generation mechanism. Instead of randomizing both the 16-bit transaction ID (query ID) and the source UDP port - the two primary defenses against DNS spoofing - inet_res generates a process-global sequential transaction ID that is trivially predictable. Response validation relies almost entirely on matching this ID, leaving systems vulnerable if an attacker can observe a single query (to learn the current ID sequence) or predict the next transaction ID. The inet_res resolver was designed for trusted network environments with trusted recursive resolvers, but earlier documentation did not clearly communicate this deployment constraint, potentially leading to unsafe deployments in Internet-facing or untrusted-network scenarios.

RemediationAI

Upgrade Erlang/OTP to patched versions: OTP 28.4.2 or later, OTP 27.3.4.10 or later, or OTP 26.2.5.19 or later. Vendor-released patches are available via the commits listed at https://github.com/erlang/otp/commit/36f23c9d2cc54afe83671dd7343596d7972839a5, https://github.com/erlang/otp/commit/dd15e8eb03548c5e55e9915f0e91389ec6bad9fd, and https://github.com/erlang/otp/commit/b057a9d995017b1be50d6dc02edd52382f3231b8. For deployments unable to immediately upgrade, mitigate by restricting inet_res use to trusted network segments with trusted recursive DNS resolvers only, or replacing inet_res with an external DNS resolver (e.g., systemd-resolved or OS-native resolver). Review https://www.erlang.org/doc/system/versions.html#order-of-versions for release timeline and patching paths.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed

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CVE-2026-28810 vulnerability details – vuln.today
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