UBUNTU-CVE-2026-65625

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Source
https://ubuntu.com/security/CVE-2026-65625
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65625.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-65625
Upstream
Published
2026-10-26T20:17:00Z
Modified
2026-10-28T20:17:34Z
Severity
  • 5.9 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • 5.9 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The pure-Erlang AES-GCM fallback in jose_jwa_aes derives the number of verified authentication tag bits from the attacker-supplied tag itself. In the {aes_gcm, Bits} clause of block_decrypt/4, the incoming tag is guarded only by is_binary/1, with no check on its length. Verification in gcm_block_decrypt/6 then computes TBits = bit_size(T) and compares only those bits of the real 128-bit tag. An attacker who controls a JWE token can truncate the authentication tag to as little as 8 bits, so only 8 bits are ever checked. This reduces forgery resistance from 2^-128 to 2^-8, and a forged ciphertext is reliably accepted as authentic within 256 attempts without knowledge of the key (an authentication tag forgery and integrity bypass). Supplying a tag longer than 128 bits instead causes a badmatch that crashes the decrypting process. The fallback is reached through the public JWE decryption path whenever AES-GCM is not provided by a native crypto NIF, for example on FIPS or stripped or older OTP builds. This issue affects jose: from 1.2.0 before 1.11.13.

References

Affected packages

Ubuntu:18.04:LTS
jose

Package

Name
jose
Purl
pkg:deb/ubuntu/jose?arch=source&distro=bionic

Affected ranges

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

Affected versions

Other
10-2
10-2build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "jose",
            "binary_version":  "10-2build1"
        },
        {
            "binary_name":  "libjose0",
            "binary_version":  "10-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65625.json"
Ubuntu:20.04:LTS
jose

Package

Name
jose
Purl
pkg:deb/ubuntu/jose?arch=source&distro=focal

Affected ranges

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

Affected versions

Other
10-2build2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "jose",
            "binary_version":  "10-2build2"
        },
        {
            "binary_name":  "libjose0",
            "binary_version":  "10-2build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65625.json"
Ubuntu:22.04:LTS
jose

Package

Name
jose
Purl
pkg:deb/ubuntu/jose?arch=source&distro=jammy

Affected ranges

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

Affected versions

Other
10-3
11-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "jose",
            "binary_version":  "11-2"
        },
        {
            "binary_name":  "libjose0",
            "binary_version":  "11-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65625.json"
Ubuntu:24.04:LTS
jose

Package

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

Affected ranges

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

Affected versions

Other
11-2
11-3
11-3build1
11-3build2
13-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "jose",
            "binary_version":  "13-1"
        },
        {
            "binary_name":  "libjose0",
            "binary_version":  "13-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65625.json"
Ubuntu:26.04:LTS
jose

Package

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

Affected ranges

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

Affected versions

Other
14-2build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "jose",
            "binary_version":  "14-2build1"
        },
        {
            "binary_name":  "libjose0",
            "binary_version":  "14-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65625.json"
Ubuntu:26.10
jose

Package

Name
jose
Purl
pkg:deb/ubuntu/jose?arch=source&distro=stonking

Affected ranges

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

Affected versions

Other
14-2build1
14-2build2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "jose",
            "binary_version":  "14-2build2"
        },
        {
            "binary_name":  "libjose0",
            "binary_version":  "14-2build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65625.json"