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Vulnerabilities

Vulnerability · CVE-2026-5466

wolfSSL's ECCSI signature verifier decodes the and scalars from the signature blob via with no check that they lie in .

Published Apr 10, 2026 · catalog updated Jun 17, 2026 · the affected product

Last checked Oct 28, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-5466. EPSS is 0.19%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.19%
Remediation
Not established
Affected products
cpe wolfssl/wolfssl

wolfSSL's ECCSI signature verifier decodes the and scalars from the signature blob via with no check that they lie in . A crafted forged signature could verify against any message for any identity, using only publicly-known constants.

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.

  • cpe wolfssl/wolfsslversion unspecified

How to fix CVE-2026-5466

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • 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-2026-5466. EPSS is 0.19%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-347: Improper Verification of Cryptographic Signature. EPSS 0.19%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 10, 2026 · NIST NVD

    Detected

    wolfSSL's ECCSI signature verifier decodes the and scalars from the signature blob via with no check that they lie in . A crafted forged signature could verify against any message for any identity, using only publicly-known constants.

  2. Jun 17, 2026 · NIST NVD

    Updated

    wolfSSL's ECCSI signature verifier decodes the and scalars from the signature blob via with no check that they lie in . A crafted forged signature could verify against any message for any identity, using only publicly-known constants.

Sources

  • CVE.orgVulnerability recordCVE-2026-5466

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-5466

    30-day exploitation probability 0.19%

    first.org
  • NIST NVDVulnerability recordCVE-2026-5466

    wolfSSL's ECCSI signature verifier decodes the and scalars from the signature blob via with no check that they lie in . A crafted forged signature could verify against any message for any identity, using only publicly-

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 28, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 28, 2026
  • CVE.orgOct 16, 2026
  • NIST NVDOct 15, 2026