DEBIAN-CVE-2026-55964

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Source

https://security-tracker.debian.org/tracker/CVE-2026-55964

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55964.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-55964

Upstream

CVE-2026-55964

Published

2026-06-25T20:17:16Z

Modified

2026-09-14T17:03:20Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator

Summary

[none]

Details

Chain intermediate CA:TRUE without keyCertSign accepted as a signing CA. Intermediate CA certificates are required to have the keyCertSign key usage when a Key Usage extension is present, but chain-supplied temporary CAs (WOLFSSL_TEMP_CA) added while building a certificate path were previously exempted from this check, so an intermediate asserting CA:TRUE but lacking keyCertSign was accepted as a signing CA. The check now applies to chain-supplied temporary CAs as well; only operator-loaded root certificates (WOLFSSL_USER_CA) and self-signed roots remain exempt. Per RFC 5280 an absent Key Usage extension implies all usages, so the requirement is enforced only when the extension is actually present (extKeyUsageSet). Affects the OpenSSL-compatibility certificate-path-building path (X509_verify_cert / X509_STORE, OPENSSL_EXTRA/OPENSSL_ALL), where untrusted chain intermediates are added as temporary CAs; native (non-OpenSSL-compat) certificate verification does not create temporary CAs and is unaffected. Within those builds, the check applies unless ALLOW_INVALID_CERTSIGN is defined.

References

https://security-tracker.debian.org/tracker/CVE-2026-55964

Affected packages

Debian:12 / wolfssl

Package

Name: wolfssl
Purl: pkg:deb/debian/wolfssl?arch=source&distro=bookworm

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.5.4-2

5.5.4-2+deb12u1

5.5.4-2+deb12u2

5.5.4-2+deb12u3

5.5.4-2.1

5.6.4-1

5.6.4-2

5.6.6-1

5.6.6-1.1

5.6.6-1.2

5.6.6-1.3~exp1

5.6.6-1.3

5.7.0-0.1

5.7.0-0.2

5.7.0-0.3

5.7.2-0.1

5.7.2-0.2

5.7.2-0.3

5.7.2-0.4

5.8.2-1

5.8.2-1.1

5.8.2-1.2

5.8.4-1

5.9.0-0.1

5.9.0-0.2

5.9.1-0.1

5.9.2-1

Ecosystem specific

{
    "urgency": "end-of-life"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55964.json"

Debian:13 / wolfssl