CVE-2026-28386 — Out-of-bounds Read in Openssl
Severity
9.1CRITICALNVD
EPSS
0.1%
top 79.45%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedApr 7
Latest updateApr 8
Description
Issue summary: Applications using AES-CFB128 encryption or decryption on
systems with AVX-512 and VAES support can trigger an out-of-bounds read
of up to 15 bytes when processing partial cipher blocks.
Impact summary: This out-of-bounds read may trigger a crash which leads to
Denial of Service for an application if the input buffer ends at a memory
page boundary and the following page is unmapped. There is no information
disclosure as the over-read bytes are not written to output.
The vulnerab…
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HExploitability: 3.9 | Impact: 5.2
Affected Packages2 packages
🔴Vulnerability Details
2GHSA▶
GHSA-q457-vx59-3fqg: Issue summary: Applications using AES-CFB128 encryption or decryption on
systems with AVX-512 and VAES support can trigger an out-of-bounds read
of up↗2026-04-08
OSV▶
CVE-2026-28386: Issue summary: Applications using AES-CFB128 encryption or decryption on systems with AVX-512 and VAES support can trigger an out-of-bounds read of up↗2026-04-07
📋Vendor Advisories
2🕵️Threat Intelligence
1💬Community
1Bugzilla▶
CVE-2026-28386 openssl: openssl: Denial of Service due to out-of-bounds read in AES-CFB128↗2026-03-25