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TI-2026-23004 Aliases CVE-2026-28810

Predictable DNS Transaction IDs Enable Cache Poisoning in Built-in Resolver

Priority LOW 28CWE-340Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Deferred Red Hat: fix deferred

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00274 19th percentileScored 2026-11-07
Fix Deferred Red Hat: fix deferred

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ErlangOTP3.0 and later—No fix listedCNA
ErlangOTP17.0 and later—No fix listedCNA
  • OTP VendorErlang Affected 3.0 and later Fixed in — No fix listed CNA
  • OTP VendorErlang Affected 17.0 and later Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*17.0 to before 26.2.5.19; 27.0 to before 27.3.4.10; 28.0 to before 28.4.2VulnerableErlang
  • cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* Versions 17.0 to before 26.2.5.19; 27.0 to before 27.3.4.10; 28.0 to before 28.4.2 Vulnerable ·Erlang

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenStack Platform 16.2AffectedNo fix yet: Fix deferred
Red Hat OpenStack Platform 17.1AffectedNo fix yet: Fix deferred
Red Hat OpenStack Platform 18.0AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-28810

References

Patch 3

Advisory 3

Other 1

  • TI-2025-23504 Erlang/OTP SSH Vulnerable to Pre-Authentication RCE KEVCVSS 3.1CRITICAL 10.0
  • TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
  • TI-2017-14604 The Erlang otp TLS server answers with different TLS alerts to different error types in… CVSS 3.0MEDIUM 5.9
  • TI-2026-36669 Stack buffer overflow in SCTP error cause parsing in inet_drv allows remote VM crash CVSS 4.0HIGH 8.8
  • TI-2022-17230 In Erlang/OTP before 23.3.4.15, 24.x before 24.3.4.2, and 25.x before 25.0.2, there is a… CVSS 3.1CRITICAL 9.8
  • TI-2016-08327 An issue was discovered in Erlang/OTP 18.x. CVSS 3.0CRITICAL 9.8
See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences