CVE-2026-71967

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-08-10. A secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 10, 2026

Last Modified

September 16, 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.

Affected Packages

(1 across 1 ecosystem)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
optee-os4.10.0-1 ... 4.9.0-1 (6 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 68× 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.

Showing the most recent 100 of 137 total refreshes for this CVE.

  1. 2026-10-05 07:46 UTCEG score recompute
  2. 2026-10-05 07:46 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 04:25 UTCEG score recompute
  5. 2026-10-04 04:25 UTCGHSA enrichment
  6. 2026-10-03 14:26 UTCEPSS rescore
  7. 2026-10-02 09:18 UTCEG score recompute
  8. 2026-10-02 09:18 UTCGHSA enrichment
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-09-30 22:35 UTCEG score recompute
  11. 2026-09-30 22:35 UTCGHSA enrichment
  12. 2026-09-30 15:03 UTCEPSS rescore
  13. 2026-09-28 13:52 UTCEPSS rescore
  14. 2026-09-28 12:49 UTCEG score recompute
  15. 2026-09-28 12:49 UTCGHSA enrichment
  16. 2026-09-27 13:48 UTCEPSS rescore
  17. 2026-09-27 12:42 UTCEG score recompute
  18. 2026-09-27 12:42 UTCGHSA enrichment
  19. 2026-09-26 15:59 UTCEPSS rescore
  20. 2026-09-25 04:01 UTCEG score recompute
  21. 2026-09-25 04:01 UTCGHSA enrichment
  22. 2026-09-23 21:10 UTCEG score recompute
  23. 2026-09-23 21:10 UTCGHSA enrichment
  24. 2026-09-23 17:54 UTCEPSS rescore
  25. 2026-09-22 21:16 UTCEG score recompute
Show 75 more
  1. 2026-09-22 21:16 UTCGHSA enrichment
  2. 2026-09-21 22:02 UTCEG score recompute
  3. 2026-09-21 22:02 UTCGHSA enrichment
  4. 2026-09-21 21:09 UTCEPSS rescore
  5. 2026-09-20 22:43 UTCEG score recompute
  6. 2026-09-20 22:43 UTCGHSA enrichment
  7. 2026-09-20 20:16 UTCEPSS rescore
  8. 2026-09-19 23:13 UTCEG score recompute
  9. 2026-09-19 23:13 UTCGHSA enrichment
  10. 2026-09-19 00:00 UTCEG score recompute
  11. 2026-09-19 00:00 UTCGHSA enrichment
  12. 2026-09-18 19:28 UTCEPSS rescore
  13. 2026-09-18 00:49 UTCEG score recompute
  14. 2026-09-18 00:49 UTCGHSA enrichment
  15. 2026-09-16 21:10 UTCEG score recompute
  16. 2026-09-16 21:10 UTCGHSA enrichment
  17. 2026-09-16 14:08 UTCEPSS rescore
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-16 02:29 UTCEG score recompute
  20. 2026-09-16 02:29 UTCGHSA enrichment
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-15 01:20 UTCGHSA enrichment
  23. 2026-09-14 02:08 UTCEG score recompute
  24. 2026-09-14 02:08 UTCGHSA enrichment
  25. 2026-09-13 02:57 UTCEG score recompute
  26. 2026-09-13 02:57 UTCGHSA enrichment
  27. 2026-09-12 15:02 UTCEPSS rescore
  28. 2026-09-12 03:45 UTCEG score recompute
  29. 2026-09-12 03:45 UTCGHSA enrichment
  30. 2026-09-11 14:53 UTCEPSS rescore
  31. 2026-09-11 04:33 UTCEG score recompute
  32. 2026-09-11 04:33 UTCGHSA enrichment
  33. 2026-09-10 09:35 UTCEPSS rescore
  34. 2026-09-10 05:15 UTCEG score recompute
  35. 2026-09-10 05:15 UTCGHSA enrichment
  36. 2026-09-09 05:51 UTCEG score recompute
  37. 2026-09-09 05:51 UTCGHSA enrichment
  38. 2026-09-08 22:01 UTCEPSS rescore
  39. 2026-09-07 17:16 UTCEG score recompute
  40. 2026-09-07 17:16 UTCGHSA enrichment
  41. 2026-09-06 13:48 UTCEPSS rescore
  42. 2026-09-06 01:26 UTCEG score recompute
  43. 2026-09-06 01:26 UTCGHSA enrichment
  44. 2026-09-05 01:56 UTCEG score recompute
  45. 2026-09-05 01:56 UTCGHSA enrichment
  46. 2026-09-04 05:07 UTCEPSS rescore
  47. 2026-09-04 01:57 UTCGHSA enrichment
  48. 2026-09-03 02:30 UTCEG score recompute
  49. 2026-09-03 02:30 UTCGHSA enrichment
  50. 2026-09-02 14:12 UTCEPSS rescore
  51. 2026-09-01 13:54 UTCEPSS rescore
  52. 2026-09-01 13:36 UTCEG score recompute
  53. 2026-09-01 13:36 UTCGHSA enrichment
  54. 2026-09-01 04:40 UTCEPSS rescore
  55. 2026-08-31 09:57 UTCEG score recompute
  56. 2026-08-31 09:57 UTCGHSA enrichment
  57. 2026-08-30 19:17 UTCEPSS rescore
  58. 2026-08-30 10:23 UTCGHSA enrichment
  59. 2026-08-29 11:09 UTCEG score recompute
  60. 2026-08-29 11:08 UTCGHSA enrichment
  61. 2026-08-28 21:42 UTCEPSS rescore
  62. 2026-08-28 11:40 UTCEG score recompute
  63. 2026-08-28 11:40 UTCGHSA enrichment
  64. 2026-08-27 09:14 UTCEG score recompute
  65. 2026-08-27 09:14 UTCGHSA enrichment
  66. 2026-08-26 14:47 UTCEPSS rescore
  67. 2026-08-26 09:59 UTCGHSA enrichment
  68. 2026-08-25 10:24 UTCEG score recompute
  69. 2026-08-25 10:23 UTCGHSA enrichment
  70. 2026-08-24 11:10 UTCEG score recompute
  71. 2026-08-24 11:09 UTCGHSA enrichment
  72. 2026-08-23 11:57 UTCGHSA enrichment
  73. 2026-08-22 12:46 UTCEG score recompute
  74. 2026-08-22 12:46 UTCGHSA enrichment
  75. 2026-08-21 23:49 UTCEPSS rescore

Related CVEs(same product + 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 on August 10, 2026, with the most recent update on September 16, 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 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71967?
CVE-2026-71967 has a CVSS base score of 5.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71967?
An upstream fix for CVE-2026-71967 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-71967 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-71967

Explore →

Is Your Infrastructure Affected by CVE-2026-71967?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs