CVE-2026-49421

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.1% (2nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cisa-adp, epss
7.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.1Exploit: None knownExposed services: Not assessed

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

The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted.

A process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory. A caller relying on this flag for path containment may delete files outside the intended directory tree.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100CISA 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%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (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 19, 2026

Last Modified

September 1, 2026

Advisory Details (1)

Auto-updated Aug 26, 2026
No fix on record yet.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-08 08:53 UTCEG score recompute
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 21:24 UTCEG score recompute
  6. 2026-10-06 15:18 UTCEPSS rescore
  7. 2026-10-06 08:02 UTCEG score recompute
  8. 2026-10-05 17:43 UTCEPSS rescore
  9. 2026-10-03 17:00 UTCEG score recompute
  10. 2026-10-03 14:25 UTCEPSS rescore
  11. 2026-10-03 01:40 UTCEG score recompute
  12. 2026-10-01 22:50 UTCEG score recompute
  13. 2026-10-01 19:50 UTCEPSS rescore
  14. 2026-09-30 21:19 UTCEG score recompute
  15. 2026-09-30 15:03 UTCEPSS rescore
  16. 2026-09-30 08:53 UTCEG score recompute
  17. 2026-09-28 21:45 UTCEG score recompute
  18. 2026-09-28 13:51 UTCEPSS rescore
  19. 2026-09-27 20:15 UTCEG score recompute
  20. 2026-09-27 13:48 UTCEPSS rescore
  21. 2026-09-27 07:16 UTCEG score recompute
  22. 2026-09-26 15:59 UTCEPSS rescore
  23. 2026-09-26 00:27 UTCEPSS rescore
  24. 2026-09-25 00:57 UTCEG score recompute
  25. 2026-09-23 20:54 UTCEG score recompute
Show 43 more
  1. 2026-09-23 17:53 UTCEPSS rescore
  2. 2026-09-22 19:59 UTCEG score recompute
  3. 2026-09-18 00:11 UTCEG score recompute
  4. 2026-09-16 22:48 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 09:53 UTCEG score recompute
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-15 08:46 UTCEG score recompute
  9. 2026-09-13 19:22 UTCEG score recompute
  10. 2026-09-13 16:47 UTCEPSS rescore
  11. 2026-09-12 18:28 UTCEG score recompute
  12. 2026-09-11 17:34 UTCEG score recompute
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-10 16:38 UTCEG score recompute
  15. 2026-09-10 09:35 UTCEPSS rescore
  16. 2026-09-09 02:44 UTCEG score recompute
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-07 03:05 UTCEG score recompute
  19. 2026-09-06 13:47 UTCEPSS rescore
  20. 2026-09-06 01:03 UTCEG score recompute
  21. 2026-09-04 23:57 UTCEG score recompute
  22. 2026-09-04 11:05 UTCEG score recompute
  23. 2026-09-04 05:06 UTCEPSS rescore
  24. 2026-09-02 21:22 UTCEG score recompute
  25. 2026-09-02 14:12 UTCEPSS rescore
  26. 2026-08-30 03:33 UTCEG score recompute
  27. 2026-08-30 01:22 UTCEPSS rescore
  28. 2026-08-29 02:39 UTCEG score recompute
  29. 2026-08-28 21:41 UTCEPSS rescore
  30. 2026-08-27 19:24 UTCEG score recompute
  31. 2026-08-27 14:25 UTCEPSS rescore
  32. 2026-08-26 18:02 UTCEG score recompute▲ 7.10
  33. 2026-08-26 18:01 UTCMITRE cvelistV5CVSS v3 → 7.1 · severity → HIGH
  34. 2026-08-26 14:46 UTCEPSS rescore
  35. 2026-08-25 13:49 UTCEPSS rescore
  36. 2026-08-23 00:19 UTCEPSS rescore
  37. 2026-08-22 03:04 UTCEG score recompute
  38. 2026-08-21 23:49 UTCEPSS rescore
  39. 2026-08-20 22:55 UTCEPSS rescore
  40. 2026-08-19 17:04 UTCEPSS rescore
  41. 2026-08-19 06:21 UTCNVD update
  42. 2026-08-19 05:39 UTCEG score recompute
  43. 2026-08-19 05:37 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-49421?
CVE-2026-49421 is a high vulnerability published on August 19, 2026. The kernel function that implements unlinkat(2) and funlinkat(2) validated the ATRESOLVEBENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted. A process that uses ATRESOLVEBENEATH with unlinkat(2) or…
When was CVE-2026-49421 disclosed?
CVE-2026-49421 was first published on August 19, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49421 actively exploited?
CVE-2026-49421 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-49421?
CVE-2026-49421 has a CVSS v3.1 base score of 7.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-49421?
No fix for CVE-2026-49421 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-49421

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