UBUNTU-CVE-2026-85534

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Source
https://ubuntu.com/security/CVE-2026-85534
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85534.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-85534
Upstream
  • CVE-2026-85534
Published
2026-09-04T11:17:00Z
Modified
2026-10-01T00:22:18Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.

References

Affected packages

Ubuntu:Pro:22.04:LTS / libsoup3

Package

Name
libsoup3
Purl
pkg:deb/ubuntu/libsoup3?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.4-2
3.0.4-3
3.0.5-1
3.0.7-0ubuntu1
3.0.7-0ubuntu1+esm1
3.0.7-0ubuntu1+esm2
3.0.7-0ubuntu1+esm3
3.0.7-0ubuntu1+esm4
3.0.7-0ubuntu1+esm5
3.0.7-0ubuntu1+esm6
3.0.7-0ubuntu1+esm7
3.0.7-0ubuntu1+esm8

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "gir1.2-soup-3.0",
            "binary_version":  "3.0.7-0ubuntu1+esm8"
        },
        {
            "binary_name":  "libsoup-3.0-0",
            "binary_version":  "3.0.7-0ubuntu1+esm8"
        },
        {
            "binary_name":  "libsoup-3.0-common",
            "binary_version":  "3.0.7-0ubuntu1+esm8"
        },
        {
            "binary_name":  "libsoup-3.0-tests",
            "binary_version":  "3.0.7-0ubuntu1+esm8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85534.json"

Ubuntu:24.04:LTS / libsoup3

Package

Name
libsoup3
Purl
pkg:deb/ubuntu/libsoup3?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.4.2-4
3.4.4-1
3.4.4-2
3.4.4-4
3.4.4-5
3.4.4-5build1
3.4.4-5build2
3.4.4-5ubuntu0.1
3.4.4-5ubuntu0.2
3.4.4-5ubuntu0.3
3.4.4-5ubuntu0.4
3.4.4-5ubuntu0.5
3.4.4-5ubuntu0.6
3.4.4-5ubuntu0.7
3.4.4-5ubuntu0.8

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "gir1.2-soup-3.0",
            "binary_version":  "3.4.4-5ubuntu0.8"
        },
        {
            "binary_name":  "libsoup-3.0-0",
            "binary_version":  "3.4.4-5ubuntu0.8"
        },
        {
            "binary_name":  "libsoup-3.0-common",
            "binary_version":  "3.4.4-5ubuntu0.8"
        },
        {
            "binary_name":  "libsoup-3.0-tests",
            "binary_version":  "3.4.4-5ubuntu0.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85534.json"

Ubuntu:26.04:LTS / libsoup3

Package

Name
libsoup3
Purl
pkg:deb/ubuntu/libsoup3?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.6.5-4
3.6.5-5
3.6.5-6
3.6.5-7
3.6.5-9
3.6.6-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "gir1.2-soup-3.0",
            "binary_version":  "3.6.6-1"
        },
        {
            "binary_name":  "libsoup-3.0-0",
            "binary_version":  "3.6.6-1"
        },
        {
            "binary_name":  "libsoup-3.0-common",
            "binary_version":  "3.6.6-1"
        },
        {
            "binary_name":  "libsoup-3.0-tests",
            "binary_version":  "3.6.6-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85534.json"