CVE-2026-49114

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM 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: 0.2%CVSS: 7.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
7.1HIGHmedium confidence
EG Risk
48
EG Risk 48/100CISA 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
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (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 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
githubMentions a patch (unverified)🟡 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(2)

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 rangeFix by version rangeDependents
onnx1.12.0-2 ... 1.21.0-1 (21 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
onnx1.17.0-3 ... 1.21.0-1 (9 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
onnx1.17.0-3 ... 1.21.0-1 (9 versions)
  • every version on: no fix on record
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
onnx0.1 ... 1.9.0 (47 versions)
  • every version up to 1.21.0: fixed in 1.21.0
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 46× 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 112 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-49114?
CVE-2026-49114 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-49114?
A fix for CVE-2026-49114 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-49114 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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