USN-8943-1

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Source
https://ubuntu.com/security/notices/USN-8943-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8943-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8943-1
Upstream
Published
2026-10-20T14:49:32Z
Modified
2026-10-21T04:43:04Z
Summary
protobuf vulnerability
Details

It was discovered that Protocol Buffers did not properly handle negative varint lengths or enforce recursion limits when parsing input in the PHP library. An attacker could possibly use this issue to cause applications using Protocol Buffers to crash or consume resources, resulting in a denial of service.

References

Affected packages

Ubuntu:24.04:LTS / protobuf

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.21.12-8.2ubuntu0.4

Affected versions

3.*
3.21.12-7ubuntu1
3.21.12-8ubuntu1
3.21.12-8ubuntu5
3.21.12-8.2
3.21.12-8.2build1
3.21.12-8.2ubuntu0.1
3.21.12-8.2ubuntu0.2
3.21.12-8.2ubuntu0.3

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "elpa-protobuf-mode",
            "binary_version":  "3.21.12-8.2ubuntu0.4"
        },
        {
            "binary_name":  "libprotobuf-java",
            "binary_version":  "3.21.12-8.2ubuntu0.4"
        },
        {
            "binary_name":  "libprotobuf-lite32t64",
            "binary_version":  "3.21.12-8.2ubuntu0.4"
        },
        {
            "binary_name":  "libprotobuf32t64",
            "binary_version":  "3.21.12-8.2ubuntu0.4"
        },
        {
            "binary_name":  "libprotoc32t64",
            "binary_version":  "3.21.12-8.2ubuntu0.4"
        },
        {
            "binary_name":  "php-google-protobuf",
            "binary_version":  "3.21.12-8.2ubuntu0.4"
        },
        {
            "binary_name":  "protobuf-compiler",
            "binary_version":  "3.21.12-8.2ubuntu0.4"
        },
        {
            "binary_name":  "python3-protobuf",
            "binary_version":  "3.21.12-8.2ubuntu0.4"
        },
        {
            "binary_name":  "ruby-google-protobuf",
            "binary_version":  "3.21.12-8.2ubuntu0.4"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [],
    "ecosystem":  "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8943-1.json"

Ubuntu:26.04:LTS / protobuf

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.21.12-15ubuntu1.1

Affected versions

3.*
3.21.12-11ubuntu3
3.21.12-14
3.21.12-14build1
3.21.12-15
3.21.12-15ubuntu1

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "elpa-protobuf-mode",
            "binary_version":  "3.21.12-15ubuntu1.1"
        },
        {
            "binary_name":  "libprotobuf-java",
            "binary_version":  "3.21.12-15ubuntu1.1"
        },
        {
            "binary_name":  "libprotobuf-lite32t64",
            "binary_version":  "3.21.12-15ubuntu1.1"
        },
        {
            "binary_name":  "libprotobuf32t64",
            "binary_version":  "3.21.12-15ubuntu1.1"
        },
        {
            "binary_name":  "libprotoc32t64",
            "binary_version":  "3.21.12-15ubuntu1.1"
        },
        {
            "binary_name":  "php-google-protobuf",
            "binary_version":  "3.21.12-15ubuntu1.1"
        },
        {
            "binary_name":  "protobuf-compiler",
            "binary_version":  "3.21.12-15ubuntu1.1"
        },
        {
            "binary_name":  "python3-protobuf",
            "binary_version":  "3.21.12-15ubuntu1.1"
        },
        {
            "binary_name":  "ruby-google-protobuf",
            "binary_version":  "3.21.12-15ubuntu1.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [],
    "ecosystem":  "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8943-1.json"