CVE-2026-18929

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (41st 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: epss, secondary
Trending — 3 sources updated this week
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Carbone is vulnerable to Denial of Service due to lack of protection against zip bombs when processing .docx files. The library uses yazl for zip decompression without validating entry sizes, allowing an attacker to supply a malicious .docx file containing a zip bomb that decompresses to a significantly larger size, causing excessive memory consumption and crashing the application server.

The issue was fixed in versions: 3.8.2, 4.26.3 and 5.4.4.  The fix is available across all distribution types.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100CISA 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
Severity69% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
41st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

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 18, 2026

Last Modified

August 28, 2026

Advisory Details (3)

Auto-updated Aug 18, 2026
Patch available. Sources: github_commit.
github_commit

commit eb9b4cff992c (carboneio/carbone)

Fix landed in carboneio/carbone commit eb9b4cff992c — awaiting tagged release

https://github.com/carboneio/carbone/commit/eb9b4cff992cc1cb1a319d7fc0cbd09160dc214e
generic

Carbone - Open Source Report and Document Generator

https://carbone.io/
generic Patch Available

Vulnerability in Carbone software | CERT Polska

https://cert.pl/en/posts/2026/08/CVE-2026-18929

Vendor Advisories for CVE-2026-18929(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 13× in last 7d / 64× 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 116 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-18929?
CVE-2026-18929 is a medium vulnerability published on August 18, 2026. Carbone is vulnerable to Denial of Service due to lack of protection against zip bombs when processing .docx files. The library uses yazl for zip decompression without validating entry sizes, allowing an attacker to supply a malicious .docx file containing a zip bomb that decompresses to a…
When was CVE-2026-18929 disclosed?
CVE-2026-18929 was first published on August 18, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18929 actively exploited?
CVE-2026-18929 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18929?
CVE-2026-18929 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18929?
A fix for CVE-2026-18929 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18929 are linked in the Vendor Advisories panel on this page.

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