CVE-2026-28810 (GCVE-0-2026-28810)
Vulnerability from cvelistv5 – Published: 2026-04-07 07:50 – Updated: 2026-04-08 04:08
VLAI?
Title
Predictable DNS Transaction IDs Enable Cache Poisoning in Built-in Resolver
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 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.
Severity ?
CWE
- CWE-340 - Generation of Predictable Numbers or Identifiers
Assigner
References
| URL | Tags | |
|---|---|---|
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|
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Impacted products
Credits
Luigino Camastra / Aisle Research
Raimo Niskanen
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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.\\n\\nThis vulnerability is associated with program files lib/kernel/src/inet_db.erl and lib/kernel/src/inet_res.erl.\\n\\nThis 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Generation of Predictable Numbers or Identifiers vulnerability in Erlang/OTP kernel (inet_res, inet_db modules) allows DNS Cache Poisoning.\u003cp\u003eThe built-in DNS resolver (\u003ctt\u003einet_res\u003c/tt\u003e) 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.\u003c/p\u003e\u003cp\u003e\u003ctt\u003einet_res\u003c/tt\u003e 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.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/kernel/src/inet_db.erl\u003c/tt\u003e and \u003ctt\u003elib/kernel/src/inet_res.erl\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis 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.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-340\", \"description\": \"CWE-340 Generation of Predictable Numbers or Identifiers\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The application must use inet_res for DNS resolution, either by configuring the lookup method to include dns in the kernel inet configuration, or by calling inet_res functions directly. The default Erlang/OTP configuration uses native OS resolution and is not affected.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The application must use \u003ctt\u003einet_res\u003c/tt\u003e for DNS resolution, either by configuring the lookup method to include \u003ctt\u003edns\u003c/tt\u003e in the kernel inet configuration, or by calling \u003ctt\u003einet_res\u003c/tt\u003e functions directly. The default Erlang/OTP configuration uses native OS resolution and is not affected.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"26.2.5.19\", \"versionStartIncluding\": \"17.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"27.3.4.10\", \"versionStartIncluding\": \"27.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"28.4.2\", \"versionStartIncluding\": \"28.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-04-08T04:08:49.797Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-28810\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-08T04:08:49.797Z\", \"dateReserved\": \"2026-03-03T14:40:00.590Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-04-07T07:50:11.072Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
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}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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