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CVE-2026-32144: Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows OCSP design

33
Routine
HIGH 7.4REMOTEUPGRADEUPGRADEUPGRADE

CVE-2026-32144 is a high-severity flaw (CVSS 7.4) affecting erlang\/otp, erlang\/public key, erlang\/ssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows OCSP designated-responder authorization bypass via missing signature verification. The OCSP response validation in public_key:pkix_ocsp_validate/5 does not verify that a CA-designated responder certificate was cryptographically signed by the issuing CA. Instead, it only checks that the responder certificate's issuer name matches the CA's subject na

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.4 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.2% (top 90%)
CISA exploited listNo
WeaknessCWE-295, CWE-347
Published2026-04-07
Last modified2026-10-26
Publisher (CNA): EEF · Vendor: erlang

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

Am I affected?

Timeline

erlang erlang\/otp UPGRADE
Affected: >= 27.0 and < 27.3.4.10 · >= 28.0 and < 28.4.2
Fixed in: 27.3.4.10, 28.4.2
Safe to downgrade to: a release before 27.0
1. Check installed version
apt-cache policy erlangotp || rpm -q erlangotp || erlangotp --version
2. UPGRADE to 27.3.4.10 (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 27.0 (Debian / Ubuntu)
apt-cache madison erlangotp sudo apt install erlangotp=<VERSION_BEFORE_27.0> 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_27.0> 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.
erlang erlang\/public key UPGRADE
Affected: >= 1.16 and < 1.17.1.2 · >= 1.18 and < 1.20.3
Fixed in: 1.17.1.2, 1.20.3
Safe to downgrade to: a release before 1.16
1. Check installed version
apt-cache policy erlangpublic-key || rpm -q erlangpublic-key || erlangpublic-key --version
2. UPGRADE to 1.17.1.2 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade erlangpublic-key
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade erlangpublic-key
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 1.16 (Debian / Ubuntu)
apt-cache madison erlangpublic-key sudo apt install erlangpublic-key=<VERSION_BEFORE_1.16> sudo apt-mark hold erlangpublic-key
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list erlangpublic-key sudo dnf downgrade erlangpublic-key-<VERSION_BEFORE_1.16> sudo dnf versionlock add erlangpublic-key
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.
erlang erlang\/ssl UPGRADE
Affected: >= 11.2 and < 11.2.12.7 · > 11.3 and < 11.5.4
Fixed in: 11.2.12.7, 11.5.4
Safe to downgrade to: a release before 11.2
1. Check installed version
apt-cache policy erlangssl || rpm -q erlangssl || erlangssl --version
2. UPGRADE to 11.2.12.7 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade erlangssl
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade erlangssl
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 11.2 (Debian / Ubuntu)
apt-cache madison erlangssl sudo apt install erlangssl=<VERSION_BEFORE_11.2> sudo apt-mark hold erlangssl
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list erlangssl sudo dnf downgrade erlangssl-<VERSION_BEFORE_11.2> sudo dnf versionlock add erlangssl
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-2026-32144?

erlang\/otp: upgrade to 27.3.4.10, 28.4.2; erlang\/public key: upgrade to 1.17.1.2, 1.20.3; erlang\/ssl: upgrade to 11.2.12.7, 11.5.4. Exact commands for each OS are on this page.

Is CVE-2026-32144 being exploited?

CVE-2026-32144 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-2026-32144 affect?

CVE-2026-32144 affects erlang\/otp, erlang\/public key, erlang\/ssl. Severity is high (CVSS 7.4). Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows OCSP designated-responder authorization bypass via missing signature verification. The OCSP response validation in public_key:pkix_ocsp_vali

How urgent is CVE-2026-32144?

Priority 33/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

References

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