CVE-2026-49114

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory published 2026-08-21. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: Elevated riskExposed: 0

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

In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim serializes external data can deterministically pre-plant a symlink that is being followed, causing the victim's write to append to any file the victim can write, e.g. ~/.ssh/authorized_keys, cron files, or application configs. Fixed in 1.21.0.

CVSS v3
7.1
EG Score
7.1(high)
EG Risk
48(Track)
EG Risk 48/100SSVC: 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
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

August 21, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Aug 21, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic
https://www.cve.org/CVERecord?id=CVE-2026-49114
github Patch Available🟡 PoC Available

TOCTOU arbitrary file read/write in save_external_dat · Advisory · onnx/onnx · GitHub

https://github.com/onnx/onnx/security/advisories/GHSA-q56x-g2fj-4rj6

Vendor Advisories for CVE-2026-49114(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
onnx1.12.0-2 ... 1.20.0-6 (20 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
onnx1.17.0-3 ... 1.20.0-6 (8 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
onnx1.17.0-3 ... 1.20.0-6 (8 versions)——
PyPI(1)
PackageVulnerable rangeFixed inDependents
onnx0.1 ... 1.9.0 (47 versions)1.21.0—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 79× 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. 2026-09-19 04:44 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 03:48 UTCEG score recompute
  4. 2026-09-16 14:16 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-15 04:24 UTCEG score recompute
  7. 2026-09-14 04:00 UTCEG score recompute
  8. 2026-09-13 16:47 UTCEPSS rescore
  9. 2026-09-12 15:28 UTCEG score recompute
  10. 2026-09-11 15:03 UTCEG score recompute
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-10 14:41 UTCEG score recompute
  13. 2026-09-10 09:35 UTCEPSS rescore
  14. 2026-09-09 01:47 UTCEG score recompute
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-08 03:40 UTCEG score recompute
  17. 2026-09-08 03:40 UTCGHSA enrichment
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-07 15:29 UTCGHSA enrichment
  20. 2026-09-07 00:36 UTCEG score recompute
  21. 2026-09-07 00:36 UTCGHSA enrichment
  22. 2026-09-06 13:47 UTCEPSS rescore
  23. 2026-09-06 12:24 UTCGHSA enrichment
  24. 2026-09-06 00:14 UTCEG score recompute
  25. 2026-09-06 00:14 UTCGHSA enrichment
Show 54 more
  1. 2026-09-05 12:03 UTCGHSA enrichment
  2. 2026-09-04 23:49 UTCEG score recompute
  3. 2026-09-04 23:49 UTCGHSA enrichment
  4. 2026-09-04 10:26 UTCEG score recompute
  5. 2026-09-04 10:26 UTCGHSA enrichment
  6. 2026-09-04 05:06 UTCEPSS rescore
  7. 2026-09-03 22:15 UTCGHSA enrichment
  8. 2026-09-03 09:13 UTCGHSA enrichment
  9. 2026-09-02 21:02 UTCGHSA enrichment
  10. 2026-09-02 08:45 UTCGHSA enrichment
  11. 2026-09-01 20:31 UTCEG score recompute
  12. 2026-09-01 20:31 UTCGHSA enrichment
  13. 2026-09-01 13:54 UTCEPSS rescore
  14. 2026-09-01 08:21 UTCGHSA enrichment
  15. 2026-08-31 20:09 UTCGHSA enrichment
  16. 2026-08-31 07:56 UTCGHSA enrichment
  17. 2026-08-30 19:46 UTCEG score recompute
  18. 2026-08-30 19:46 UTCGHSA enrichment
  19. 2026-08-30 19:17 UTCEPSS rescore
  20. 2026-08-30 07:35 UTCEG score recompute
  21. 2026-08-30 07:35 UTCGHSA enrichment
  22. 2026-08-30 01:22 UTCEPSS rescore
  23. 2026-08-29 19:24 UTCGHSA enrichment
  24. 2026-08-29 07:06 UTCEG score recompute
  25. 2026-08-29 07:06 UTCGHSA enrichment
  26. 2026-08-28 21:41 UTCEPSS rescore
  27. 2026-08-28 18:52 UTCGHSA enrichment
  28. 2026-08-28 06:38 UTCGHSA enrichment
  29. 2026-08-27 18:18 UTCEG score recompute
  30. 2026-08-27 18:18 UTCGHSA enrichment
  31. 2026-08-27 14:25 UTCEPSS rescore
  32. 2026-08-27 05:12 UTCGHSA enrichment
  33. 2026-08-26 17:02 UTCEG score recompute
  34. 2026-08-26 17:02 UTCGHSA enrichment
  35. 2026-08-26 14:46 UTCEPSS rescore
  36. 2026-08-26 06:58 UTCGHSA enrichment
  37. 2026-08-25 18:47 UTCEG score recompute
  38. 2026-08-25 18:47 UTCGHSA enrichment
  39. 2026-08-25 13:49 UTCEPSS rescore
  40. 2026-08-25 06:36 UTCGHSA enrichment
  41. 2026-08-24 18:26 UTCEG score recompute
  42. 2026-08-24 18:26 UTCGHSA enrichment
  43. 2026-08-24 06:15 UTCGHSA enrichment
  44. 2026-08-23 18:04 UTCGHSA enrichment
  45. 2026-08-23 05:53 UTCEG score recompute
  46. 2026-08-23 05:53 UTCGHSA enrichment
  47. 2026-08-23 00:19 UTCEPSS rescore
  48. 2026-08-22 17:43 UTCGHSA enrichment
  49. 2026-08-22 05:32 UTCEG score recompute
  50. 2026-08-22 05:32 UTCGHSA enrichment
  51. 2026-08-21 17:21 UTCEG score recompute
  52. 2026-08-21 16:51 UTCEG score recompute
  53. 2026-08-21 16:20 UTCEG score recompute
  54. 2026-08-21 16:19 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-49114?
CVE-2026-49114 is a high vulnerability published on August 21, 2026. In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim…
When was CVE-2026-49114 disclosed?
CVE-2026-49114 was first published in the National Vulnerability Database on August 21, 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-2026-49114 actively exploited?
CVE-2026-49114 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 94.5% of all scored CVEs.
What is the CVSS score of CVE-2026-49114?
CVE-2026-49114 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-49114?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49114, 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

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