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Fencer Vulns
medium 6.2

CVE-2026-56755 json

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

published 2026-07-21 3 mo ago modified 2026-08-26 2 mo ago also GHSA-6hm7-3pwj-22rm , GO-2026-6037 , EUVD-2026-58146

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits
0
none known

Summary

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

Patch / fix

  • go code.gitea.io/gitea 1.27.0
  • go gitea.dev 1.27.0
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go code.gitea.io/gitea
<1.27.0
1.27.0
go gitea.dev
<1.27.0
1.27.0

Affected products

  • Gitea Gitea Open Source Git Server

Classification

Weakness
  • CWE-284 Improper Access Control
  • CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.