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

medium Tenable Self-Hosted Container Security Plugin ID 478520

Description

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

 - Issue summary: A TLS 1.3 connection using certificate compression can be forced to allocate a large buffer
 before decompression without checking against the configured certificate size limit. Impact summary: An
 attacker can cause per-connection memory allocations of up to approximately 22 MiB and extra CPU work,
 potentially leading to service degradation or resource exhaustion (Denial of Service). In affected
 configurations, the peer-supplied uncompressed certificate length from a CompressedCertificate message is
 used to grow a heap buffer prior to decompression. This length is not bounded by the max_cert_list
 setting, which otherwise constrains certificate message sizes. An attacker can exploit this to cause large
 per-connection allocations followed by handshake failure. No memory corruption or information disclosure
 occurs. This issue only affects builds where TLS 1.3 certificate compression is compiled in (i.e., not
 OPENSSL_NO_COMP_ALG) and at least one compression algorithm (brotli, zlib, or zstd) is available, and
 where the compression extension is negotiated. Both clients receiving a server CompressedCertificate and
 servers in mutual TLS scenarios receiving a client CompressedCertificate are affected. Servers that do not
 request client certificates are not vulnerable to client-initiated attacks. Users can mitigate this issue
 by setting SSL_OP_NO_RX_CERTIFICATE_COMPRESSION to disable receiving compressed certificates. The FIPS
 modules in 3.6, 3.5, 3.4 and 3.3 are not affected by this issue, as the TLS implementation is outside the
 OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4 and 3.3 are vulnerable to this issue. OpenSSL 3.0,
 1.1.1 and 1.0.2 are not affected by this issue. (CVE-2025-66199)

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-2025-66199

Plugin Details

Severity: Medium

ID: 478520

Version: Revision 1.1

Type: Local

Published: 11/5/2026

Updated: 11/5/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.6

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

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

CVSS Score Source: CVE-2025-66199

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

Vector: CVSS:3.0/AV:N/AC:H/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: 1/27/2026

Reference Information

CVE: CVE-2025-66199