Security incident · CVE-2026-54872
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 informatio
Published Sep 29, 2026 · catalog updated Oct 26, 2026 · Issue summary: The generic
Last checked Oct 26, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-54872. EPSS is 0.43%. Act only if a listed version of Issue summary: The generic is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (Issue summary: The generic).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Low3.7
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.43%
- Remediation
- Advisory link
- Affected products
- Debian:12 openssl · Debian:13 openssl · Debian:14 openssl
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 key. CWE: CWE-208: Observable Timing Discrepancy Description: The generic elliptic-curve scalar multiplication used for curves that do not have a dedicated constant-time implementation pads the secret scalar with non-constant-time BIGNUM operations, so the time taken depends on the value of the secret scalar derived from the ECDSA and SM2 nonce. The leak is very small; observing it requires a large number of measurements. The effect is largest for curves whose group order lies on a machine-word boundary, such as brainpoolP384r1. Applications using ECDSA signing over the Brainpool and other generic prime curves, and SM2 signing on platforms that use the generic implementation, are vulnerable to this issue. The NIST curves P-256, P-384 and P-521 use dedicated constant-time implementations and are not affected. FIPS Impact: no The FIPS modules are not affected: the approved NIST curves used in the FIPS provider have dedicated constant-time implementations and do not use the affected code path.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- Debian:12 openssl0 → 3.0.22-1~deb12u2
- Debian:13 openssl0 → 3.5.7-1~deb13u3
- Debian:14 openssl0 → 3.6.5-1
How to fix CVE-2026-54872
Upgrade
CVE-2026-54872 lists a fix boundary at 3.0.22-1~deb12u2. Compare the installed build with that boundary before you change production.
Version check
Fixed in 3.0.22-1~deb12u2 · 2 other ranges on the advisory
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-54872. EPSS is 0.43%. Act only if a listed version of Issue summary: The generic is installed.
Which versions are affected?
Compare what you have installed with 0 → 3.0.22-1~deb12u2, 0 → 3.5.7-1~deb13u3, 0 → 3.6.5-1. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.43%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 29, 2026 · Trivy Vulnerability DB
Detected
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
Oct 26, 2026 · Trivy Vulnerability DB
Fix available
openssl fixed in 3.0.22-1~deb12u2; openssl fixed in 3.5.7-1~deb13u3; openssl fixed in 3.6.5-1
Oct 26, 2026 · Trivy Vulnerability DB
Fix available
openssl fixed in 3.0.22-1~deb12u2
Oct 26, 2026 · Trivy Vulnerability DB
Fix available
openssl fixed in 3.5.7-1~deb13u3
Oct 26, 2026 · Trivy Vulnerability DB
Fix available
openssl fixed in 3.6.5-1
Oct 26, 2026 · Trivy Vulnerability DB
Updated
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
Sources
- CVE.orgVulnerability recordCVE-2026-54872
Official CVE identifier
cve.org - Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-54872
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 m
osv.dev
References
Freshness
Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- CVE.orgOct 26, 2026
- Trivy Vulnerability DBOct 26, 2026