What is CVE-2026-56755?

CVE-2026-56755 is a medium-severity vulnerability in Gitea Open Source Git Server, classified under Improper Access Control. CVSS score: 6.2/10. Published 2026-08-13.

How severe is CVE-2026-56755?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Vulnerability in Gitea Open Source Git Server

CVE-2026-56755

Denial of Service (CPU & Memory Exhaustion) via O(N^2) String Concatenation in Debian Package Upload

Published 2026-08-13 · last modified 2026-08-26.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (6.1th percentile), scored 2026-09-27.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000

Affected products

Gitea Open Source Git Server — versions 0

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

88ee5874-cf24-4952-aea0-31affedb7ff2 (vendor-advisory)
88ee5874-cf24-4952-aea0-31affedb7ff2 (release-notes)
88ee5874-cf24-4952-aea0-31affedb7ff2 (release-notes)

Frequently asked questions

What is CVE-2026-56755?: CVE-2026-56755 is a medium-severity vulnerability in Gitea Open Source Git Server, classified under Improper Access Control. CVSS score: 6.2/10. Published 2026-08-13.
How severe is CVE-2026-56755?: Medium severity. CVSS v3 base score is 6.2 out of 10.