CVE-2026-28810: Generation of Predictable Numbers or Identifiers vulnerability in Erlang/OTP kernel (inet_res, inet_db modules

Routine

LOW 3.7REMOTEUPGRADE

CVE-2026-28810 is a low-severity flaw (CVSS 3.7) affecting erlang\/otp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 n

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-340
Published	2026-04-07
Last modified	2026-10-26

Publisher (CNA): EEF · Vendor: erlang

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 09:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

erlang erlang\/otp UPGRADE

Affected: >= 17.0 and < 26.2.5.19 · >= 27.0 and < 27.3.4.10 · >= 28.0 and < 28.4.2

Fixed in: 26.2.5.19, 27.3.4.10, 28.4.2

Safe to downgrade to: a release before 17.0

1. Check installed version

apt-cache policy erlangotp || rpm -q erlangotp || erlangotp --version

2. UPGRADE to 26.2.5.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade erlangotp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade erlangotp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 17.0 (Debian / Ubuntu)

apt-cache madison erlangotp sudo apt install erlangotp=<VERSION_BEFORE_17.0> sudo apt-mark hold erlangotp

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list erlangotp sudo dnf downgrade erlangotp-<VERSION_BEFORE_17.0> sudo dnf versionlock add erlangotp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-28810?

erlang\/otp: upgrade to 26.2.5.19, 27.3.4.10, 28.4.2. Exact commands for each OS are on this page.

Is CVE-2026-28810 being exploited?

CVE-2026-28810 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28810 affect?

CVE-2026-28810 affects erlang\/otp. Severity is low (CVSS 3.7). 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 UD

How urgent is CVE-2026-28810?

Priority 23/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-28808 CRITICAL 9.8 UPGRADE UPGRADE Incorrect Authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scrip
CVE-2026-32144 HIGH 7.4 UPGRADE UPGRADE Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows OCSP design
CVE-2026-32147 MEDIUM 4.3 UPGRADE UPGRADE Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Erlang OTP ssh
CVE-2026-49759 HIGH 8.2 UPGRADE UPGRADE Stack-based Buffer Overflow vulnerability in Erlang OTP erts (inet_drv) allows an unauthenticated remote attac
CVE-2026-42790 HIGH 8.1 UPGRADE Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_cert and public_key modules) al

References

← Back to latest CVEs