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Echo: openssl-3.5.0: security update to 3.5.0+e1

high Tenable Cloud Security Plugin ID 478426

Description

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

 - Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly sends ack-eliciting packets
 while not acknowledging ACK-only responses, the QUIC stack can retain ACK-only packet metadata for the
 lifetime of the connection. Impact summary: A remote peer that can complete a QUIC handshake can cause
 connection-scoped memory growth which may lead to Denial of Service through memory exhaustion, especially
 with sustained traffic or many concurrent QUIC connections. CWE: CWE-770: Allocation of Resources Without
 Limits or Throttling Description: When the OpenSSL QUIC stack sends an ACK-only packet, there is no
 requirement by the QUIC protocol that the peer will acknowledge that ACK-only packet (i.e. it is itself
 not ack-eliciting). However, the OpenSSL implementation stores the metadata about the ACK frames
 regardless. In and of itself that's ok, but if a malicious peer establishes a connection, and then drives
 the connection such that ACK-only packets are forced from the OpenSSL implementation peer (i.e., by
 sending numerous PING frames), and then withholding any subsequent acks for ack-eliciting data, like
 legitimate data, said malicious peer can force inappropriate memory growth on the OpenSSL peer,
 potentially leading to a Denial of Service. The fix is to ensure that we account for the transmission of
 the ACK-only packet in the packet histories high and low watermark without actually storing the ACK-only
 packet metadata itself. FIPS impact: no The OpenSSL FIPS module is not affected as the QUIC code is
 outside the FIPS module boundary. (CVE-2026-63075)

Solution

Update the openssl-3.5.0 library and its related packages to version 3.5.0+e1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-63075

Plugin Details

Severity: High

ID: 478426

Version: Revision 1.1

Type: Local

Published: 11/5/2026

Updated: 11/5/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-63075

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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: 8/5/2026

Reference Information

CVE: CVE-2026-63075