CVE-2026-71967

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-08-10. the CNA's CVSS baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference vulnerability in the Widevine pseudo-TA open_session handler that allows Normal World clients to cause a denial of service when CFG_WIDEVINE_PTA is enabled. Attackers can open a session directly on the Widevine PTA to trigger an unconditional dereference of a NULL calling session pointer via is_user_ta_ctx(), faulting the TEE at S-EL1 and crashing the trusted execution environment.

CVSS v3
5.5
EG Score
5.5(high)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 14, 2026

Advisory Details (3)

Auto-updated Aug 10, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session | Advisories | VulnCheck

https://www.vulncheck.com/advisories/op-tee-os-null-pointer-dereference-dos-via-widevine-pta-open-session
github_commit

commit 0aadfc23407f (OP-TEE/optee_os)

Fix landed in OP-TEE/optee_os commit 0aadfc23407f — awaiting tagged release

https://github.com/OP-TEE/optee_os/commit/0aadfc23407f50e770eb5ddd871fc208f5626833
github_pr

core: pta: widevine: reject a NULL calling session in open_session

Fix merged in OP-TEE/optee_os PR #7899 on 2026-08-06 — awaiting tagged release

https://github.com/OP-TEE/optee_os/pull/7899

Vendor Advisories for CVE-2026-71967(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 35× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 14:17 UTCEG score recompute
  3. 2026-08-20 14:17 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 14:36 UTCGHSA enrichment
  6. 2026-08-18 15:17 UTCEG score recompute
  7. 2026-08-18 15:17 UTCGHSA enrichment
  8. 2026-08-18 13:49 UTCEPSS rescore
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-17 14:44 UTCEG score recompute
  11. 2026-08-17 14:44 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 15:33 UTCEG score recompute
  14. 2026-08-16 15:33 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 02:15 UTCEPSS rescore
  18. 2026-08-15 16:22 UTCEG score recompute
  19. 2026-08-15 16:22 UTCGHSA enrichment
  20. 2026-08-15 01:31 UTCEPSS rescore
  21. 2026-08-14 17:10 UTCEG score recompute
  22. 2026-08-14 17:10 UTCGHSA enrichment
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-13 19:07 UTCGHSA enrichment
  25. 2026-08-12 19:55 UTCEG score recompute
Show 10 more
  1. 2026-08-12 19:55 UTCGHSA enrichment
  2. 2026-08-12 13:51 UTCEPSS rescore
  3. 2026-08-11 20:43 UTCEG score recompute
  4. 2026-08-11 20:43 UTCGHSA enrichment
  5. 2026-08-10 21:32 UTCEG score recompute
  6. 2026-08-10 21:32 UTCGHSA enrichment
  7. 2026-08-10 21:15 UTCEG score recompute
  8. 2026-08-10 19:27 UTCEG score recompute
  9. 2026-08-10 18:35 UTCEG score recompute
  10. 2026-08-10 18:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-71967?
CVE-2026-71967 is a medium vulnerability published on August 10, 2026. OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference vulnerability in the Widevine pseudo-TA opensession handler that allows Normal World clients to cause a denial of service when CFGWIDEVINEPTA is enabled. Attackers can open a session directly on the Widevine PTA…
When was CVE-2026-71967 disclosed?
CVE-2026-71967 was first published in the National Vulnerability Database on August 10, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71967 actively exploited?
CVE-2026-71967 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.9% of all scored CVEs.
What is the CVSS score of CVE-2026-71967?
CVE-2026-71967 has a CVSS v4.0 base score of 5.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-71967?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71967, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-71967

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