UBUNTU-CVE-2026-45372

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Source
https://ubuntu.com/security/CVE-2026-45372
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45372.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-45372
Upstream
Downstream
Related
Published
2026-05-29T20:16:00Z
Modified
2026-06-25T13:30:09Z
Severity
  • 9.9 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. The validity check (is_field_value) is run before decoding, so encoded %0D%0A passes the check and is then expanded to a literal \r\n byte pair inside the stored header value. This vulnerability is fixed in 0.44.0.

References

Affected packages

Ubuntu:Pro:22.04:LTS / cpp-httplib

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.10.3+ds-1ubuntu0.1~esm2

Affected versions

0.*
0.9.9+ds-1
0.9.10+ds-1
0.10.1+ds-1
0.10.2+ds-1
0.10.3+ds-1
0.10.3+ds-1ubuntu0.1~esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libcpp-httplib0",
            "binary_version": "0.10.3+ds-1ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45372.json"

Ubuntu:Pro:24.04:LTS / cpp-httplib

Package

Name
cpp-httplib
Purl
pkg:deb/ubuntu/cpp-httplib?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.14.3+ds-1.1ubuntu0.1~esm2

Affected versions

0.*
0.13.1+ds-1ubuntu1
0.14.3+ds-1
0.14.3+ds-1.1
0.14.3+ds-1.1build1
0.14.3+ds-1.1build2
0.14.3+ds-1.1ubuntu0.1~esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libcpp-httplib0.14t64",
            "binary_version": "0.14.3+ds-1.1ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45372.json"

Ubuntu:25.10 / cpp-httplib

Package

Name
cpp-httplib
Purl
pkg:deb/ubuntu/cpp-httplib?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.18.7-1ubuntu0.25.10.2

Affected versions

0.*
0.18.7-1
0.18.7-1ubuntu0.25.10.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libcpp-httplib0.18",
            "binary_version": "0.18.7-1ubuntu0.25.10.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45372.json"

Ubuntu:Pro:26.04:LTS / cpp-httplib

Package

Name
cpp-httplib
Purl
pkg:deb/ubuntu/cpp-httplib?arch=source&distro=esm-apps%2Fresolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.26.0+ds-2ubuntu3+esm1

Affected versions

0.*
0.18.7-1
0.26.0+ds-2ubuntu2
0.26.0+ds-2ubuntu3

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libcpp-httplib0.26",
            "binary_version": "0.26.0+ds-2ubuntu3+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45372.json"