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CVE-2006-4339

Red Hat Enterprise Linux 3 · Vulnerability

CVSS 3.1 9.1 CRITICALCheck source for fixed versionsKEV status unknown
Original advisory

Historical advisory recorded 30 Oct 2026 17:45:26 UTC. Read the latest advisory.

cve-program · CVE-2006-4339

Published

A flaw was found in OpenSSL. When configured to use an RSA key with exponent 3, OpenSSL improperly removes PKCS-1 padding before generating a hash. This allows remote attackers to forge PKCS #1 v1.5 signatures. Consequently, OpenSSL may incorrectly verify X.509 and other certificates, leading to a bypass of trust and authentication mechanisms.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2006-4339

Published

Openssl: openssl: signature forgery via improper pkcs-1 padding removal leading to certificate validation bypass

A flaw was found in OpenSSL. When configured to use an RSA key with exponent 3, OpenSSL improperly removes PKCS-1 padding before generating a hash. This allows remote attackers to forge PKCS #1 v1.5 signatures. Consequently, OpenSSL may incorrectly verify X.509 and other certificates, leading to a bypass of trust and authentication mechanisms.

Source published
5 Sep 2006 17:00:00 UTC
Source modified
30 Oct 2026 16:33:15 UTC
Saved here
30 Oct 2026 17:45:26 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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Sources read 14 Nov 23:34 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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