CVE-2026-19671

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-18. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Malcolm's upload-processing pipeline (scripts/safe-extract.py) enforces entry-count, nesting-depth, and total-uncompressed-byte limits when extracting container archives (zip/tar/rar/7z via libarchive), but those limits are not applied when the uploaded file is a single-stream compressed format (.gz, .bz2, .xz, .lzma, .lz) that isn't a .tar.*-style archive. Any authenticated user permitted to upload PCAP/log files can upload a small, highly compressible file (e.g. a gzip bomb) that decompresses to an effectively unbounded size on disk, exhausting the shared Docker volume used by OpenSearch, Logstash, Arkime, and Zeek, and disrupting the platform for all users.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100CISA 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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (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 18, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github, cisa.
github Patch Available🟡 PoC Available

Raw-stream and Lzip Uploads Bypass Malcolm's Archive-Bomb Protections · Advisory · cisagov/Malcolm · GitHub

https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6
cisa Patch Available🔴 Active Exploitation

CISA Malcolm | CISA

CISA Malcolm | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01

Vendor Advisories for CVE-2026-19671(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 / 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 125 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-19671?
CVE-2026-19671 is a medium vulnerability published on August 18, 2026. Malcolm's upload-processing pipeline (scripts/safe-extract.py) enforces entry-count, nesting-depth, and total-uncompressed-byte limits when extracting container archives (zip/tar/rar/7z via libarchive), but those limits are not applied when the uploaded file is a single-stream compressed format…
When was CVE-2026-19671 disclosed?
CVE-2026-19671 was first published on August 18, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19671 actively exploited?
CVE-2026-19671 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19671?
CVE-2026-19671 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19671?
A fix for CVE-2026-19671 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-19671 are linked in the Vendor Advisories panel on this page.

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