CVE-2026-81560

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 5.3 from GitHub Security Advisory published 2026-08-27. A secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 5.3Exploit: No code on recordExposed services: Not assessed

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

The CVE record's description, written by its CNA (VulDB), states the affected versions: "A vulnerability was identified in blackms aistack up to 1.6.1." No release containing a fix is confirmed on record.

A vulnerability was identified in blackms aistack up to 1.6.1. Affected by this issue is some unknown functionality of the file src/web/server.ts of the component Static File Handler. Such manipulation of the argument req.url leads to path traversal. The attack can be executed remotely. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
55
EG Risk 55/100

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 (value × EchelonGraph’s weight)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 27, 2026

Last Modified

August 29, 2026

Advisory Details (2)

Auto-updated Aug 27, 2026
No fix on record yet.
Web page

GitHub - blackms/aistack: Production-grade agent orchestration for Claude Code - 11 agents, 46 MCP tools, SQLite+FTS5, drift detection, consensus checkpoints · GitHub

https://github.com/blackms/aistack/
Web page

Path Traversal File Read Vulnerability in @blackms/aistack · Issue #57 · blackms/aistack · GitHub

https://github.com/blackms/aistack/issues/57

Vendor Advisories for CVE-2026-81560(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 17× in last 7d / 77× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 132 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 34 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  2. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  3. 2026-10-12 14:56 UTCEG score recompute
  4. 2026-10-11 19:20 UTCEG score recompute
  5. 2026-10-11 16:37 UTCEG score recompute
  6. 2026-10-11 13:55 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  9. 2026-10-10 09:48 UTCEG score recompute
  10. 2026-10-10 09:48 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  12. 2026-10-09 07:17 UTCEG score recompute
  13. 2026-10-09 07:17 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  14. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  15. 2026-10-08 07:17 UTCEG score recompute
  16. 2026-10-08 07:17 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-10-07 07:25 UTCEG score recompute
  19. 2026-10-07 07:25 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  20. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  21. 2026-10-06 07:33 UTCEG score recompute
  22. 2026-10-06 07:33 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-10-05 05:55 UTCEG score recompute
  25. 2026-10-05 05:55 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
Show 73 more
  1. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  2. 2026-10-04 06:02 UTCEG score recompute
  3. 2026-10-04 06:02 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  4. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  5. 2026-10-03 06:11 UTCEG score recompute
  6. 2026-10-03 06:11 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  7. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  8. 2026-10-02 06:19 UTCEG score recompute
  9. 2026-10-02 06:19 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  11. 2026-10-01 05:31 UTCEG score recompute
  12. 2026-10-01 05:31 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  13. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  14. 2026-09-30 05:05 UTCEG score recompute
  15. 2026-09-30 05:05 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  16. 2026-09-28 21:17 UTCEG score recompute
  17. 2026-09-28 21:17 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  18. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  19. 2026-09-27 18:42 UTCEG score recompute
  20. 2026-09-27 18:42 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  22. 2026-09-26 18:50 UTCEG score recompute
  23. 2026-09-26 18:50 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  25. 2026-09-25 00:13 UTCEG score recompute
  26. 2026-09-25 00:13 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  27. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  28. 2026-09-24 00:08 UTCEG score recompute
  29. 2026-09-24 00:07 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  30. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  31. 2026-09-23 00:16 UTCEG score recompute
  32. 2026-09-23 00:16 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  33. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  34. 2026-09-22 00:24 UTCEG score recompute
  35. 2026-09-22 00:24 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  36. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  37. 2026-09-21 00:33 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  38. 2026-09-20 00:41 UTCEG score recompute
  39. 2026-09-20 00:41 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  40. 2026-09-19 00:48 UTCEG score recompute
  41. 2026-09-19 00:48 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  42. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  43. 2026-09-18 00:57 UTCEG score recompute
  44. 2026-09-18 00:57 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  45. 2026-09-17 01:06 UTCEG score recompute
  46. 2026-09-17 01:06 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  47. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  48. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  49. 2026-09-16 01:14 UTCEG score recompute
  50. 2026-09-16 01:14 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  51. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  52. 2026-09-15 01:21 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  53. 2026-09-14 01:29 UTCEG score recompute
  54. 2026-09-14 01:29 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  55. 2026-09-13 01:37 UTCEG score recompute
  56. 2026-09-13 01:37 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  57. 2026-09-12 01:45 UTCEG score recompute
  58. 2026-09-12 01:45 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  59. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  60. 2026-09-11 01:53 UTCEG score recompute
  61. 2026-09-11 01:53 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  62. 2026-09-10 02:01 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  63. 2026-09-09 02:09 UTCEG score recompute
  64. 2026-09-09 02:09 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  65. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  66. 2026-09-08 02:18 UTCEG score recompute
  67. 2026-09-08 02:18 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  68. 2026-09-07 02:26 UTCEG score recompute
  69. 2026-09-07 02:26 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  70. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  71. 2026-09-06 02:29 UTCEG score recompute
  72. 2026-09-06 02:29 UTCGHSA enrichmentGHSA-rxcf-vrwm-22vh · GitHub CVSS 5.3
  73. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile

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Frequently asked(5)

What is CVE-2026-81560?
CVE-2026-81560 is a medium-severity vulnerability; its CVE record was published on August 27, 2026. A vulnerability was identified in blackms aistack up to 1.6.1. Affected by this issue is some unknown functionality of the file src/web/server.ts of the component Static File Handler. Such manipulation of the argument req.url leads to path traversal. The attack can be executed remotely. The exploit…
When was the CVE record for CVE-2026-81560 published?
The CVE record for CVE-2026-81560 was published on August 27, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 29, 2026; the record at its source may have been updated since.
Is CVE-2026-81560 actively exploited?
CVE-2026-81560 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-81560?
CVE-2026-81560 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-81560?
No fix for CVE-2026-81560 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. The CVE record's description, written by its CNA (VulDB), states the affected versions: "A vulnerability was identified in blackms aistack up to 1.6.1." No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-81560 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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