USN-8861-1

It was discovered that OpenSSL had an inefficient algorithm in its QUIC stream reassembly implementation. A remote attacker could possibly use this issue to cause OpenSSL to use excessive CPU resources, leading to a denial of service. (CVE-2026-42772)

It was discovered that OpenSSL did not properly limit memory allocated for QUIC packet buffers. A remote attacker could possibly use this issue to cause OpenSSL to use excessive memory resources, leading to a denial of service. (CVE-2026-54873)

References

Affected packages

Ubuntu:26.04:LTS / openssl

Package

Name: openssl
Purl: pkg:deb/ubuntu/openssl?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

3.5.5-1ubuntu3.7

Affected versions

3.*

3.5.3-1ubuntu2

3.5.5-1ubuntu1

3.5.5-1ubuntu3

3.5.5-1ubuntu3.2

3.5.5-1ubuntu3.3

3.5.5-1ubuntu3.4

3.5.5-1ubuntu3.5

3.5.5-1ubuntu3.6

Ecosystem specific

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libssl3t64",
            "binary_version":  "3.5.5-1ubuntu3.7"
        },
        {
            "binary_name":  "openssl",
            "binary_version":  "3.5.5-1ubuntu3.7"
        },
        {
            "binary_name":  "openssl-provider-legacy",
            "binary_version":  "3.5.5-1ubuntu3.7"
        }
    ]
}

Database specific

cves_map

{
    "cves":  [
        {
            "id":  "CVE-2026-42772",
            "severity":  [
                {
                    "score":  "low",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-54873",
            "severity":  [
                {
                    "score":  "low",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:26.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8861-1.json"