PT-2026-35055 · Op Tee · Op-Tee

Published 2026-04-24 · Updated 2026-04-25 · CVE-2026-33662

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions OP-TEE versions 3.8.0 through 4.10

Description An integer underflow occurs in the emsa pkcs1 v1 5 encode() function within the core/drivers/crypto/crypto api/acipher/rsassa.c file. The issue arises when calculating the padding size (PS size) by subtracting the digest size and other required EMA-PKCS1-v1 5 encoding fields from the key modulus size. If a sufficiently small modulus is selected, the subtraction overflows, leading to a memset() call that overwrites memory until the system crashes. This issue specifically affects platforms that register RSA acceleration.

Recommendations Update OP-TEE to a version later than 4.10.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-33662

Affected Products

Op-Tee

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-33662 · Security Note
• https://github.com/OP-TEE/optee_os/security/advisories/GHSA-4cf8-v5g3-73gr · Note
• https://twitter.com/CVEnew/status/2047798583106343049 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2047907970462122348 · Twitter Post