CVE-2026-56755Public exploitNetwork attack vector

Authenticated service interruption via unbounded Debian package parsing

Published Aug 13, 2026 · Updated Aug 13, 2026

Denial of service in Gitea before 1.27.0 allows remote authenticated users to interrupt the service via a crafted Debian upload. ParseControlFile copies an unlimited decompressed control.tar.gz stream into a strings.Builder, while Description continuation lines trigger quadratic string copying. Package-registry write access is required; one upload can exhaust memory, saturate a CPU core, and stop the Gitea service.

CVSS severity7.1
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Denial of service in Gitea before 1.27.0 allows remote authenticated users to interrupt the service via a crafted Debian upload. ParseControlFile copies an unlimited decompressed control.tar.gz stream into a strings.Builder, while Description continuation lines trigger quadratic string copying. Package-registry write access is required; one upload can exhaust memory, saturate a CPU core, and stop the Gitea service.

The record

CVE
CVE-2026-56755
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Gitea
Product
Gitea
Classifications
CWE-409, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.26.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gitea · Giteaversion=0 <=1.26.4

Published CVSS scores

7.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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