CVE-2026-28810Network attack vector

DNS cache poisoning via predictable resolver identifiers

Published Apr 7, 2026 · Updated Apr 7, 2026

DNS cache poisoning in Erlang/OTP 17.0 and later affected releases allows remote attackers to forge resolver answers over UDP. inet_res assigns sequential process-global 16-bit transaction IDs, reuses predictable source-port behavior, and validates replies primarily against the identifier. Exploitation requires an application to configure DNS lookup or call inet_res directly and an attacker to observe or predict an identifier; native OS resolution is unaffected by default.

CVSS severity6.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DNS cache poisoning in Erlang/OTP 17.0 and later affected releases allows remote attackers to forge resolver answers over UDP. inet_res assigns sequential process-global 16-bit transaction IDs, reuses predictable source-port behavior, and validates replies primarily against the identifier. Exploitation requires an application to configure DNS lookup or call inet_res directly and an attacker to observe or predict an identifier; native OS resolution is unaffected by default.

The record

CVE
CVE-2026-28810
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
Erlang
Product
Erlang/OTP
Classifications
CWE-340, CAPEC-142
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=07b8f441ca711f9812fad9e9115bab3c3aa92f79 <* changes=[{"at":"36f23c9d2cc54afe83671dd7343596d7972839a5","status":"unaffected"},{"at":"dd15e8eb03548c5e55e9915f0e91389ec6bad9fd","status":"unaffected"},{"at":"b057a9d995017b1be50d6dc02edd52382f3231b8","status":"unaffected"}]
  2. Affected versionversion=17.0 <* changes=[{"at":"28.4.2","status":"unaffected"},{"at":"27.3.4.10","status":"unaffected"},{"at":"26.2.5.19","status":"unaffected"}]
  3. Affected versionversion=3.0 <* changes=[{"at":"10.6.2","status":"unaffected"},{"at":"10.2.7.4","status":"unaffected"},{"at":"9.2.4.11","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Erlang · Erlang/OTPversion=07b8f441ca711f9812fad9e9115bab3c3aa92f79 <* changes=[{"at":"36f23c9d2cc54afe83671dd7343596d7972839a5","status":"unaffected"},{"at":"dd15e8eb03548c5e55e9915f0e91389ec6bad9fd","status":"unaffected"},{"at":"b057a9d995017b1be50d6dc02edd52382f3231b8","status":"unaffected"}]; version=17.0 <* changes=[{"at":"28.4.2","status":"unaffected"},{"at":"27.3.4.10","status":"unaffected"},{"at":"26.2.5.19","status":"unaffected"}]; version=3.0 <* changes=[{"at":"10.6.2","status":"unaffected"},{"at":"10.2.7.4","status":"unaffected"},{"at":"9.2.4.11","status":"unaffected"}]

Published CVSS scores

3.7NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
6.3Erlang/OTPCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-340Generation of Predictable Numbers or Identifiers
CAPEC-142DNS Cache Poisoning

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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