CVE-2026-33662

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-33662
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33662.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33662
Aliases
  • GHSA-4cf8-v5g3-73gr
Downstream
Published
2026-04-24T18:13:28.529Z
Modified
2026-07-08T08:11:18.089870553Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
OP-TEE: RSASSA EMSA- PKCS1-v1_5 underflow in emsa_pkcs1_v1_5_encode()
Details

OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. From 3.8.0 to 4.10, in the function emsapkcs1v15encode() in core/drivers/crypto/cryptoapi/acipher/rsassa.c, the amount of padding needed, "PS size", is calculated by subtracting the size of the digest and other fields required for the EMA-PKCS1-v15 encoding from the size of the modulus of the key. By selecting a small enough modulus, this subtraction can overflow. The padding is added as a string of 0xFF bytes with a call to memset(), and an underflowed integer will cause the memset() call to overwrite until OP-TEE crashes. This only affects platforms registering RSA acceleration.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33662.json",
    "cwe_ids": [
        "CWE-190"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/op-tee/optee_os

Affected ranges

Type
GIT
Repo
https://github.com/op-tee/optee_os
Events
Introduced
023e33656e2c9557ce50ad63a98b2e2c9b51c118
Last affected
753afbbee1682f5d16fd30e87b31058a4fd4f4b8
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "3.8.0"
        },
        {
            "last_affected": "4.10"
        }
    ]
}

Affected versions

3.*
3.10.0
3.10.0-rc1
3.11.0
3.11.0-rc1
3.12.0
3.12.0-rc1
3.13.0
3.13.0-rc1
3.14.0
3.14.0-rc1
3.15.0
3.15.0-rc1
3.16.0
3.17.0
3.17.0-rc1
3.18.0
3.18.0-rc1
3.19.0
3.19.0-rc1
3.20.0
3.20.0-rc1
3.21.0
3.21.0-rc1
3.22.0
3.22.0-rc1
3.8.0
3.9.0
3.9.0-rc1
4.*
4.0.0
4.0.0-rc1
4.1.0
4.1.0-rc1
4.10.0
4.10.0-rc1
4.2.0
4.2.0-rc1
4.3.0
4.3.0-rc1
4.4.0
4.4.0-rc1
4.5.0
4.5.0-rc1
4.6.0
4.6.0-rc1
4.7.0
4.7.0-rc1
4.8.0
4.8.0-rc1
4.9.0
4.9.0-rc1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33662.json"