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CVE-2026-54872: Issue summary: The generic elliptic-curve scalar multiplication used for ECDSA and SM2 signature operations wi

35
Routine
LOW 3.7REMOTEWATCHLISTUPGRADE

CVE-2026-54872 is a low-severity flaw (CVSS 3.7) affecting openssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Issue summary: The generic elliptic-curve scalar multiplication used for ECDSA and SM2 signature operations with curves that do not have a dedicated implementation leaks information about the secret nonce through timing. Impact summary: An attacker able to measure signing times may learn information about the per-signature secret nonce, which over many signatures can, via a lattice / Hidden Number Problem attack, lead to recovery of the private

Why this priority

  • Covered by 3 security sources
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score3.7 (Low)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.4% (top 63%)
CISA exploited listNo
WeaknessCWE-208
Published2026-09-29
Last modified2026-10-08
Publisher (CNA): OpenSSL Software Foundation · Vendor: openssl

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Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

openssl openssl UPGRADE
Affected: >= 1.0.2 and < 1.0.2zs · >= 1.1.1 and < 1.1.1zj · >= 3.0.0 and < 3.0.23 · >= 3.4.0 and < 3.4.8 · >= 3.5.0 and < 3.5.9 · >= 3.6.0 and < 3.6.5 · >= 4.0.0 and < 4.0.3
Fixed in: 1.0.2zs, 1.1.1zj, 3.0.23, 3.4.8, 3.5.9, 3.6.5, 4.0.3
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy openssl || rpm -q openssl || openssl --version
2. UPGRADE to 1.0.2zs (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade openssl
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade openssl
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Official advisories

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-2026-54872?

openssl: upgrade to 1.0.2zs, 1.1.1zj, 3.0.23, 3.4.8, 3.5.9, 3.6.5, 4.0.3. Exact commands for each OS are on this page.

Is CVE-2026-54872 being exploited?

CVE-2026-54872 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-2026-54872 affect?

CVE-2026-54872 affects openssl. Severity is low (CVSS 3.7). Issue summary: The generic elliptic-curve scalar multiplication used for ECDSA and SM2 signature operations with curves that do not have a dedicated implementation leaks information about the secret nonce through timing. Impact summary: An

How urgent is CVE-2026-54872?

Priority 35/100. Covered by 3 security sources; Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities

Related CVEs

References

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