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CVE-2026-28810— Predictable DNS Transaction IDs Enable Cache Poisoning in Built-in Resolver

Quick assessment

Affected
Erlang OTP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 28.4.2之前版本、27.3.4.10之前版本和26.2.5.19之前版本存在安全漏洞，该漏洞源于生成可预测的数字或标识符，可能导致DNS缓存投毒攻击。

CVSS 6.3 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1195 · Supply Chain Compromise

Affected Version Matrix 3

VendorProduct Version RangeStatus
Erlang OTP 3.0< * affected
17.0< * affected
07b8f441ca711f9812fad9e9115bab3c3aa92f79< * affected
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I. Basic Information for CVE-2026-28810

Vulnerability Information
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Vulnerability Title
Predictable DNS Transaction IDs Enable Cache Poisoning in Built-in Resolver
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
可预测问题
Source: CVE Program / CVE List V5
Vulnerability Title
Erlang/OTP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 28.4.2之前版本、27.3.4.10之前版本和26.2.5.19之前版本存在安全漏洞，该漏洞源于生成可预测的数字或标识符，可能导致DNS缓存投毒攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Erlang OTP 3.0 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 17.0 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-28810

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III. Intelligence Information for CVE-2026-28810

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Patches & Fixes for CVE-2026-28810 (3)

Same Patch Batch · Erlang · 2026-04-07 · 3 CVEs total

CVE-2026-28808 8.3 HIGH ScriptAlias CGI targets bypass directory auth in inets httpd (mod_auth vs mod_cgi path mis
CVE-2026-32144 7.6 HIGH OCSP designated-responder authorization bypass via missing signature verification

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-340

V. Comments for CVE-2026-28810

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