CVE-2026-18929

6.9 mediumEPSS 0.5%

Medium (6.9). EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

6.9 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-31)
CWE: CWE-409
Published: 2026-08-18
Modified: 2026-08-28
Record from: the NVD, synced 2026-10-19

References

https://carbone.io/
https://cert.pl/en/posts/2026/08/CVE-2026-18929
https://github.com/carboneio/carbone/commit/eb9b4cff992cc1cb1a319d7fc0cbd09160dc214e

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