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PatchSiren cyber security CVE debrief

CVE-2026-53763 OP-TEE CVE debrief

A low-severity vulnerability was found in OP-TEE core's AES-GCM implementation. 32-bit integer overflows cause the authentication tag to be computed with incorrect bit-length values after processing more than 512 megabytes of payload or Additional Authenticated Data (AAD). This issue affects users of OP-TEE versions 3.0.0 through 4.10.0. The vulnerability was fixed in version 4.11.0. No workarounds are available, but applying the patch is recommended to mitigate this low-severity vulnerability.

Vendor
OP-TEE
Product
optee_os
CVSS
LOW 3.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-06
Original CVE updated
2026-07-07
Advisory published
2026-07-06
Advisory updated
2026-07-07

Who should care

Users of OP-TEE versions 3.0.0 through 4.10.0 should apply patch version 4.11.0 to mitigate this vulnerability. This includes operators, platform administrators, vulnerability management teams, and security teams responsible for maintaining OP-TEE deployments.

Technical summary

The vulnerability exists in OP-TEE core's AES-GCM implementation, specifically in the way it handles 32-bit integer overflows. When more than 512 megabytes of payload or Additional Authenticated Data (AAD) is processed, the authentication tag is computed with incorrect bit-length values. This issue was fixed in version 4.11.0. Users should apply this patch to prevent potential exploitation. Affected users include operators, platform administrators, vulnerability management teams, and security teams responsible for maintaining OP-TEE deployments. They should review official advisories and apply patch version 4.11.0 to mitigate this low-severity vulnerability.

Defensive priority

Apply patch version 4.11.0 to mitigate this low-severity vulnerability.

Recommended defensive actions

  • Apply patch version 4.11.0
  • Inventory OP-TEE installations for versions 3.0.0 through 4.10.0
  • Monitor for unusual authentication tag computation errors
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-06T20:16:37.327Z and was last modified on 2026-07-07T18:53:34.977Z. The NVD entry is currently Analyzed. Evidence is limited to public sources and may not reflect the full scope of affected systems or potential impact. Defenders should verify the vulnerability's relevance to their environment and review official advisories for specific guidance.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-06T20:16:37.327Z and has not been modified since then. The NVD entry is currently Analyzed.