PT-2026-31035 · Openssl · Openssl Fips Module+1

Alex Gaynor + 2 · Published 2026-04-07 · Updated 2026-04-21 · CVE-2026-28386

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions OpenSSL FIPS Module version 3.6

Description Applications utilizing AES-CFB128 encryption or decryption on systems equipped with AVX-512 and VAES support may experience an out-of-bounds read of up to 15 bytes when handling partial cipher blocks. This can lead to a denial of service if the input buffer is at a memory page boundary and the subsequent page is unmapped. The issue occurs only when processing partial blocks and on x86-64 systems with AVX-512 and VAES instruction support.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-28386

RHSA-2026:7261

Affected Products

Openssl Fips Module

Openssl

References · 10

• https://github.com/openssl/openssl/commit/61f428a2fc6671ede184a19f71e6e495f0689621 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-28386 · Security Note
• https://openssl-library.org/news/secadv/20260407.txt · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-28386 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-28386 · Vendor Advisory
• https://twitter.com/syedaquib77/status/2041767979407327259 · Twitter Post
• https://twitter.com/CVEnew/status/2041711856444960807 · Twitter Post
• https://twitter.com/wazuh/status/2046560658808857041 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2041727087875182830 · Twitter Post
• https://twitter.com/ytroncal/status/2041621382967050497 · Twitter Post