CVE-2026-90774

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-13. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

rustypaste before 0.18.1 validates the destination path before applying the optional custom filename HTTP header, allowing attackers to bypass directory-escape checks. Attackers can supply path traversal sequences in the filename header to write files outside the configured upload directory to arbitrary locations.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

September 13, 2026

Last Modified

September 24, 2026

Advisory Details (5)

Auto-updated Sep 13, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

rustypaste before 0.18.1 Path Traversal via filename header | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rustypaste-before-0.18.1-path-traversal-via-filename-header
github_commit

commit ac05d552596a (orhun/rustypaste)

Fix landed in orhun/rustypaste commit ac05d552596a — awaiting tagged release

https://github.com/orhun/rustypaste/commit/ac05d552596af4a8429d80f30d11f67117ce02c8
generic

rustypaste/src/paste.rs at v0.18.0 · orhun/rustypaste · GitHub

https://github.com/orhun/rustypaste/blob/v0.18.0/src/paste.rs
generic

GitHub - orhun/rustypaste: A minimal file upload/pastebin service. · GitHub

https://github.com/orhun/rustypaste
generic

Path traversal via the filename header bypasses the upload-directory sandbox · Issue #622 · orhun/rustypaste · GitHub

https://github.com/orhun/rustypaste/issues/622

Vendor Advisories for CVE-2026-90774(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 27× in last 7d / 52× 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. 2026-09-25 03:22 UTCGHSA enrichment
  2. 2026-09-24 14:53 UTCEG score recompute
  3. 2026-09-24 14:53 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 05:52 UTCEG score recompute
  6. 2026-09-24 05:52 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 17:22 UTCGHSA enrichment
  9. 2026-09-23 13:43 UTCGHSA enrichment
  10. 2026-09-23 01:14 UTCEG score recompute
  11. 2026-09-23 01:14 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 12:44 UTCGHSA enrichment
  14. 2026-09-22 00:15 UTCEG score recompute
  15. 2026-09-22 00:15 UTCGHSA enrichment
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-21 11:45 UTCGHSA enrichment
  18. 2026-09-20 23:15 UTCEG score recompute
  19. 2026-09-20 23:15 UTCGHSA enrichment
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 10:46 UTCGHSA enrichment
  22. 2026-09-19 22:16 UTCEG score recompute
  23. 2026-09-19 22:16 UTCGHSA enrichment
  24. 2026-09-19 09:46 UTCGHSA enrichment
  25. 2026-09-18 21:17 UTCEG score recompute
Show 27 more
  1. 2026-09-18 21:16 UTCGHSA enrichment
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 08:04 UTCGHSA enrichment
  4. 2026-09-17 19:35 UTCEG score recompute
  5. 2026-09-17 19:35 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-17 06:59 UTCGHSA enrichment
  8. 2026-09-16 18:29 UTCEG score recompute
  9. 2026-09-16 18:29 UTCGHSA enrichment
  10. 2026-09-16 14:09 UTCEPSS rescore
  11. 2026-09-16 05:59 UTCEG score recompute
  12. 2026-09-16 05:59 UTCGHSA enrichment
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 17:30 UTCGHSA enrichment
  15. 2026-09-15 05:01 UTCEG score recompute
  16. 2026-09-15 05:00 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 16:26 UTCEG score recompute
  19. 2026-09-14 16:26 UTCGHSA enrichment
  20. 2026-09-14 15:45 UTCEG score recompute
  21. 2026-09-14 15:45 UTCGHSA enrichment
  22. 2026-09-14 12:19 UTCGHSA enrichment
  23. 2026-09-13 23:50 UTCEG score recompute
  24. 2026-09-13 23:50 UTCGHSA enrichment
  25. 2026-09-13 11:21 UTCEG score recompute
  26. 2026-09-13 10:50 UTCEG score recompute
  27. 2026-09-13 10:49 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90774?
CVE-2026-90774 is a high vulnerability published on September 13, 2026. rustypaste before 0.18.1 validates the destination path before applying the optional custom filename HTTP header, allowing attackers to bypass directory-escape checks. Attackers can supply path traversal sequences in the filename header to write files outside the configured upload directory to…
When was CVE-2026-90774 disclosed?
CVE-2026-90774 was first published in the National Vulnerability Database on September 13, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90774 actively exploited?
CVE-2026-90774 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.9% of all scored CVEs.
What is the CVSS score of CVE-2026-90774?
CVE-2026-90774 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-90774?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90774, 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.

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