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CVE-2026-54890: Integer Underflow (Wrap or Wraparound) vulnerability in erlang otp erlang/otp (erts modules), erlang otp erts

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HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2026-54890 is a high-severity flaw (CVSS 7.5) affecting erlang\/otp, erts. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer Underflow (Wrap or Wraparound) vulnerability in erlang otp erlang/otp (erts modules), erlang otp erts (erts modules) allows Forced Integer Overflow, Excessive Allocation. This vulnerability is associated with program files erts/emulator/beam/external.c, emulator/beam/external.c. The BIT_BINARY_EXT tag (77) handler in the External Term Format (ETF) decoder accepts an encoding with both length and trailing-bits fields set to zero. The subs

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.4% (top 65%)
CISA exploited listNo
WeaknessCWE-191, CWE-789, CWE-1284
Published2026-07-27
Last modified2026-10-24
Publisher (CNA): EEF · Vendor: erlang

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Last updated 2026-10-24 · 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 < 27.3.4.15 · >= 28.0 and < 28.5.0.4 · >= 29.0 and < 29.0.4
Fixed in: 27.3.4.15, 28.5.0.4, 29.0.4
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 27.3.4.15 (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 erts UPGRADE
Affected: >= 15.0 and < 15.2.7.11 · >= 16.0 and < 16.4.0.4 · >= 17.0 and < 17.0.4
Fixed in: 15.2.7.11, 16.4.0.4, 17.0.4
Safe to downgrade to: a release before 15.0
1. Check installed version
apt-cache policy erts || rpm -q erts || erts --version
2. UPGRADE to 15.2.7.11 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade erts
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade erts
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 15.0 (Debian / Ubuntu)
apt-cache madison erts sudo apt install erts=<VERSION_BEFORE_15.0> sudo apt-mark hold erts
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list erts sudo dnf downgrade erts-<VERSION_BEFORE_15.0> sudo dnf versionlock add erts
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.

Exact fixes by distribution

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source
sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310
Fedora 46 · moby-engine · FIXED · 29.9.2-2.fc46 · FEDORA-2026-4856be87b3 · source
sudo dnf upgrade --advisory=FEDORA-2026-4856be87b3
Ubuntu 20.04 · erlang · NOT AFFECTED
Ubuntu 22.04 · erlang · NOT AFFECTED
Ubuntu 24.04 · erlang · NOT AFFECTED
Debian 12 · erlang · NO FIX YET
Debian 13 · erlang · FIXED · 1:27.3.4.1+dfsg-1+deb13u3
sudo apt update && sudo apt install --only-upgrade erlang dpkg --compare-versions "$(dpkg-query -W -f='${Version}' erlang)" ge "1:27.3.4.1+dfsg-1+deb13u3" && echo PATCHED || echo STILL-VULNERABLE

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

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-2026-54890?

erlang\/otp: upgrade to 27.3.4.15, 28.5.0.4, 29.0.4; erts: upgrade to 15.2.7.11, 16.4.0.4, 17.0.4. Exact commands for each OS are on this page.

Is CVE-2026-54890 being exploited?

CVE-2026-54890 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-2026-54890 affect?

CVE-2026-54890 affects erlang\/otp, erts. Severity is high (CVSS 7.5). Integer Underflow (Wrap or Wraparound) vulnerability in erlang otp erlang/otp (erts modules), erlang otp erts (erts modules) allows Forced Integer Overflow, Excessive Allocation. This vulnerability is associated with program files erts/emul

How urgent is CVE-2026-54890?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

References

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