OP-TEE OS through 4.10.0, fixed in commit 7b8b494, contains a buffer underwrite vulnerability in the RSA NOPAD encrypt and decrypt operations within the mbedTLS software backend and SE050 hardware driver that allows a malicious Trusted Application to corrupt secure-world heap memory by supplying an input length exceeding the RSA modulus size. When src_len exceeds rsa_len, the subtraction expression wraps to a large unsigned value, causing a subsequent memcpy to write attacker-controlled data before the destination buffer in S-EL1 secure-world heap memory.
CVE-2026-71969
“—” beside the score: it is equal to the CVSS score beside it.
Score 6.7 from GitHub Security Advisory (severity: HIGH) published 2026-08-10. A secondary CVSS source baseline 6.7; sources differ by 0.0.
Also known asEUVD-2026-55699 (ENISA EUVD) · GHSA-hg7c-pmh6-576f (GitHub Security Advisories)Source: ENISA EUVD
- Lower severity and no public exploit yet
An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.
- CVSS v3
- 6.7
- EG Score
- 6.7MEDIUMmedium confidence
- EG Risk
- 30EG Risk 30/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity67% × 45%Impact severity (EG Severity): CVSS 6.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.2% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it. - EPSS PROB
- 0.2%
- EPSS %ILE
- 7th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (6.7): severity, escalated by confirmed exploitation. This CVE's 6.7 is its impact severity (EG Severity), not escalated.
- EG Severity
- 6.7 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
August 10, 2026
Last Modified
October 24, 2026
Advisory Details (4)
Auto-updated Aug 10, 2026OP-TEE OS 4.10.0 Buffer Underwrite via RSA NOPAD Encrypt/Decrypt Operations | Advisories | VulnCheck
https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operationscommit 7b8b494e0a32 (OP-TEE/optee_os)
Fix landed in OP-TEE/optee_os commit 7b8b494e0a32 — awaiting tagged release
https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3Se050 fix
Fix merged in OP-TEE/optee_os PR #7808 on 2026-08-03 — awaiting tagged release
https://github.com/OP-TEE/optee_os/pull/7808crypto: rsa: reject RSA NOPAD input longer than the modulus
Upstream fix in progress (PR #7898 · OP-TEE/optee_os, state=closed)
https://github.com/OP-TEE/optee_os/pull/7898Vendor Advisories for CVE-2026-71969(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| optee-os | 4.10.0-1 ... 4.9.0-1 (6 versions) |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 49× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 182 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 82 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-29 16:58 UTCEG score recompute
- 2026-10-29 16:58 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-25 14:07 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-24 15:29 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-10-23 19:33 UTCEG score recompute
- 2026-10-23 19:33 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-22 19:23 UTCEG score recompute
- 2026-10-22 19:23 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-18 03:16 UTCEG score recompute
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
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- 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-12 15:42 UTCEG score recompute
- 2026-10-11 19:28 UTCEG score recompute
- 2026-10-11 16:43 UTCEG score recompute
- 2026-10-11 14:03 UTCEG score recompute
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-06 18:21 UTCEG score recompute
- 2026-10-06 18:21 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-05 07:46 UTCEG score recompute
- 2026-10-05 07:46 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-04 04:25 UTCEG score recompute
- 2026-10-04 04:25 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-02 09:18 UTCEG score recompute
- 2026-10-02 09:18 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-09-30 22:35 UTCEG score recompute
- 2026-09-30 22:35 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-09-28 13:18 UTCEG score recompute
- 2026-09-28 13:18 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-09-27 12:42 UTCEG score recompute
- 2026-09-27 12:42 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-09-24 20:17 UTCEG score recompute
- 2026-09-24 20:17 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-23 23:36 UTCEG score recompute
- 2026-09-23 23:36 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-22 22:37 UTCEG score recompute
- 2026-09-22 22:37 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-21 22:01 UTCEG score recompute
- 2026-09-21 22:01 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-20 20:04 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-19 17:53 UTCEG score recompute
- 2026-09-19 17:53 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-18 17:17 UTCEG score recompute
- 2026-09-18 17:17 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-17 14:53 UTCEG score recompute
- 2026-09-17 14:53 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-16 10:59 UTCEG score recompute
- 2026-09-16 10:59 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-15 09:43 UTCEG score recompute
- 2026-09-15 09:43 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-14 09:07 UTCEG score recompute
- 2026-09-14 09:07 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-13 08:32 UTCEG score recompute
- 2026-09-13 08:32 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-12 07:56 UTCEG score recompute
- 2026-09-12 07:56 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-11 07:03 UTCEG score recompute
- 2026-09-11 07:03 UTCGHSA enrichmentGHSA-hg7c-pmh6-576f · GitHub severity HIGH · GitHub CVSS 6.7
- 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
- 2026-09-10 06:27 UTCEG score recompute
Related CVEs(same product + same CWE)
Same product
10 shownDebian:13:optee-os
Frequently asked(5)
What is CVE-2026-71969?
When was CVE-2026-71969 made public?
Is CVE-2026-71969 actively exploited?
What is the CVSS score of CVE-2026-71969?
How do I remediate CVE-2026-71969?
Dependency Blast Radius
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