CVE-2026-71271

HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

Score 8.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. A secondary CVSS source baseline 8.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.5Exploit: None knownExposed services: Not assessed

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

Memos' webhook URL validation, isReservedIP (internal/webhook/validate.go), checks a candidate IP against a reservedCIDRs list that omits 0.0.0.0/8 and never calls ip.IsUnspecified — unlike the correctly implemented sibling function isInternalIP in internal/httpgetter/html_meta.go, which does.

CVSS v3
8.5
EG Score
8.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA 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
Severity85% × 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
0.3%
EPSS %ILE
23rd
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 5, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

memos/internal/webhook/validate.go at main · usememos/memos · GitHub

https://github.com/usememos/memos/blob/main/internal/webhook/validate.go
generic

GitHub - usememos/memos: Open-source, self-hosted note-taking tool built for quick capture. Markdown-native, lightweight, and fully yours. · GitHub

https://github.com/usememos/memos

Vendor Advisories for CVE-2026-71271(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 18× in last 7d / 86× 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 205 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-71271?
CVE-2026-71271 is a high vulnerability published on August 5, 2026. Memos' webhook URL validation, isReservedIP (internal/webhook/validate.go), checks a candidate IP against a reservedCIDRs list that omits 0.0.0.0/8 and never calls ip.IsUnspecified — unlike the correctly implemented sibling function isInternalIP in internal/httpgetter/html_meta.go, which does.
When was CVE-2026-71271 disclosed?
CVE-2026-71271 was first published on August 5, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71271 actively exploited?
CVE-2026-71271 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71271?
CVE-2026-71271 has a CVSS base score of 8.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71271?
No fix for CVE-2026-71271 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 vendor advisories EchelonGraph has for CVE-2026-71271 are linked in the Vendor Advisories panel on this page.

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