Skip to content
Noroxi
CVE-2026-41516· NVD / CVE Program· CNA GitHub_M

OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle

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. Starting in version 4.5.0 and prior to version 4.11.0, the RSA PKCS#1 v1.5 decryption implementation in the Hisilicon HPRE crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Bleichenbacher-style padding oracle that allows an attacker to recover RSA PKCS#1 v1.5 plaintext. Version 4.11.0 contains a patch. As a workaround, disable Hisilicon HPRE RSA driver with `CFG_HISILICON_ACC_V3=n`.

LowCVSS 3.3 · v3.1—No exploit No fix recorded
Published
Jul 6, 2026
Updated
Jul 7, 2026
EPSS
0.1% · 3th percentile
Follow this CVE

Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.

Report tools

JSON

Action score

13

Monitor

Low priority for now.

CVSS
13 / 40 · 3.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
3.3
CNA · GitHub_M
2.5
0.8 point gap

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
trustedfirmwareop-tee

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • trustedfirmware op-tee4.5.0 and later · up to 4.10.0 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • OP-TEE optee_os

    • >= 4.5.0, < 4.11.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13optee-osall versions—

Same product

trustedfirmware: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-1010298Linaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Buffer Overflow.
    40Plan
  • CVE-2019-1010297Linaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Buffer Overflow.
    40Plan
  • CVE-2019-1010296Linaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Buffer Overflow.
    40Plan
  • CVE-2019-1010292Linaro/OP-TEE OP-TEE Prior to version v3.4.0 is affected by: Boundary checks.
    39Monitor
  • CVE-2019-1010295Linaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Buffer Overflow.
    39Monitor
  • CVE-2019-1010293Linaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Boundary crossing.
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-415140 days apartOP-TEE: RSA-OAEP padding oracle in Hisilicon HPRE driver enables plaintext recovery
    13Monitor
  • CVE-2026-415150 days apartOP-TEE: RSA-OAEP padding oracle in NXP CAAM driver enables plaintext recovery
    13Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-208 · Observable Timing Discrepancy

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

All records