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Echo: openssl-3.0.9: security update to 3.0.9+e1openssl-3.1.0: security update to 3.1.0+e1openssl-3.5.0: security update to 3.5.0+e1

critical Tenable Self-Hosted Container Security Plugin ID 478463

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Issue Summary: Cryptographic Message Services (CMS) processing fails to perform sufficient input
 validation on the cipher and tag length fields of AuthEnvelopedData containers, leading to various
 potential compromises. Impact Summary: Attackers making use of these vulnerabilities may achieve key-
 equivalent functionality for a given CMS recipient and/or bypass integrity validation for a given message.
 In one use case, an attacker may send a CMS message containing AuthEnvelopedData with the cipher specified
 as a non-AEAD cipher. OpenSSL erroneously allows this selection, and attempts to decrypt and validate the
 message. An on-path attacker who captures one legitimate AES-GCM AuthEnvelopedData addressed to the victim
 can re-emit it with the recipientInfos set left byte-for-byte intact, so the victim's private key still
 unwraps the genuine CEK (the content-encryption key), but with the inner OID rewritten to AES-256-OFB
 (Output Feedback Mode, an unauthenticated keystream mode) and with an attacker-chosen IV and ciphertext.
 The victim initializes AES-256-OFB under the real CEK, never consults the MAC field, and CMS_decrypt()
 returns success. If the application under attack responds to the attacker with any indicator showing
 success or failure of the decryption effort, it is possible for the attacker to use this as an oracle to
 obtain key equivalent functionality for the CEK used for the chosen recipient of the message. In another
 use case, an attacker can reduce the tag length of the chosen AEAD cipher for a given AuthEnvelopedData
 container to be a single byte long, allowing an attacker to brute force CMS decryption, producing an
 integrity bypass for applications that trust CMS_decrypt() to reject modified content. The FIPS modules
 are not affected by this issue. (CVE-2026-34182)

Solution

Update the openssl-3.0.9 library and its related packages to version 3.0.9+e1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-34182

Plugin Details

Severity: Critical

ID: 478463

Version: Revision 1.1

Type: Local

Published: 11/5/2026

Updated: 11/5/2026

Risk Information

VPR

Risk Factor: High

Score: 7

Percentile: 98.2

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-34182

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 11/5/2026

Vulnerability Publication Date: 6/9/2026

Reference Information

CVE: CVE-2026-34182