CVE-2026-102809

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-29. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.5Exploit: 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.

PX4 Autopilot through 1.17.0 contains an uncontrolled stack allocation vulnerability in the file2 test command that fails to validate the write chunk size parameter. Attackers with shell access can supply an excessively large value to the -c option to trigger stack overflow and crash the flight controller.

CVSS v3
6.5
EG Score
6.5MEDIUMhigh confidence
EG Risk
34
EG Risk 34/100CISA 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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
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 at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

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 at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

September 29, 2026

Last Modified

September 30, 2026

Advisory Details (5)

Auto-updated Sep 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

PX4 Autopilot through 1.17.0 Stack Exhaustion via tests file2 Command | Advisories | VulnCheck

https://www.vulncheck.com/advisories/px4-autopilot-through-1.17.0-stack-exhaustion-via-tests-file2-command
generic

GitHub - PX4/PX4-Autopilot: PX4 Autopilot Software · GitHub

https://github.com/PX4/PX4-Autopilot
generic

PX4-Autopilot/src/systemcmds/tests/test_file2.c at d6f12ad1c4f70ad3230afd7d86e971421e02fef4 · PX4/PX4-Autopilot · GitHub

https://github.com/PX4/PX4-Autopilot/blob/d6f12ad1c4f70ad3230afd7d86e971421e02fef4/src/systemcmds/tests/test_file2.c#L86-L130
github_commit

commit 46a77d8ad15e (PX4/PX4-Autopilot)

Fix landed in PX4/PX4-Autopilot commit 46a77d8ad15e — awaiting tagged release

https://github.com/PX4/PX4-Autopilot/commit/46a77d8ad15e7929ef261c41083dffd1bbfa9f85
github_pr

fix(tests): add size check when parse -c option to prevent system crash

Fix merged in PX4/PX4-Autopilot PR #28586 on 2026-09-28 — awaiting tagged release

https://github.com/PX4/PX4-Autopilot/pull/28586

Vendor Advisories for CVE-2026-102809(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 17× in last 7d / 17× 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. 2026-10-04 10:58 UTCEG score recompute
  2. 2026-10-04 10:58 UTCGHSA enrichment
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-03 12:36 UTCEG score recompute
  5. 2026-10-03 12:36 UTCGHSA enrichment
  6. 2026-10-02 14:13 UTCEG score recompute
  7. 2026-10-02 14:12 UTCGHSA enrichment
  8. 2026-10-01 19:49 UTCEPSS rescore
  9. 2026-10-01 15:49 UTCGHSA enrichment
  10. 2026-09-30 17:26 UTCEG score recompute
  11. 2026-09-30 17:26 UTCGHSA enrichment
  12. 2026-09-30 15:02 UTCEPSS rescore
  13. 2026-09-29 19:22 UTCEG score recompute
  14. 2026-09-29 19:22 UTCGHSA enrichment
  15. 2026-09-29 18:31 UTCEG score recompute
  16. 2026-09-29 17:29 UTCEG score recompute
  17. 2026-09-29 17:28 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-102809?
CVE-2026-102809 is a medium vulnerability published on September 29, 2026. PX4 Autopilot through 1.17.0 contains an uncontrolled stack allocation vulnerability in the file2 test command that fails to validate the write chunk size parameter. Attackers with shell access can supply an excessively large value to the -c option to trigger stack overflow and crash the flight…
When was CVE-2026-102809 disclosed?
CVE-2026-102809 was first published on September 29, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102809 actively exploited?
CVE-2026-102809 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102809?
CVE-2026-102809 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102809?
An upstream fix for CVE-2026-102809 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-2026-102809 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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