CVE-2026-9856

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-02. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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: None knownExposed: 0

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

A vulnerability in huggingface/transformers versions <=5.8.0.dev0 allows an attacker to perform arbitrary file writes via path traversal. The issue resides in the save_pretrained() methods of PreTrainedTokenizerBase and ProcessorMixin, where keys from the chat_template dictionary are used directly as filenames without proper validation. An attacker can exploit this by publishing a malicious Hugging Face Hub repository with a crafted tokenizer_config.json file. When a victim downloads and saves the tokenizer or processor, the attacker-controlled keys can escape the intended save directory, enabling arbitrary file writes with attacker-controlled content. This vulnerability affects multiple processors inheriting from ProcessorMixin, including Idefics, Florence, Gemma, Phi, and Qwen-VL.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

August 2, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Aug 2, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit eaaaf8494dd5 (huggingface/transformers)

Fix landed in huggingface/transformers commit eaaaf8494dd5 — awaiting tagged release

https://github.com/huggingface/transformers/commit/eaaaf8494dd5386634ae37d1d122212fdc315be5

Vendor Advisories for CVE-2026-9856(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)
PyPI(1)
PackageVulnerable rangeFixed inDependents
transformers0.1 ... 5.9.0 (226 versions)5.10.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 74× 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 150 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-9856?
CVE-2026-9856 is a high vulnerability published on August 2, 2026. A vulnerability in huggingface/transformers versions <=5.8.0.dev0 allows an attacker to perform arbitrary file writes via path traversal. The issue resides in the savepretrained() methods of PreTrainedTokenizerBase and ProcessorMixin, where keys from the chattemplate dictionary are used directly as…
When was CVE-2026-9856 disclosed?
CVE-2026-9856 was first published in the National Vulnerability Database on August 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9856 actively exploited?
CVE-2026-9856 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 77.6% of all scored CVEs.
What is the CVSS score of CVE-2026-9856?
CVE-2026-9856 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-9856?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9856, 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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