Vulnerability in code.gitea.io/gitea (CVE-2026-56755)
Summary
Vulnerability in code.gitea.io/gitea (CVE-2026-56755). Risk of unauthorized operations or information disclosure. Exploitable via control.tar.gz. Mitigation: upgrade to 1.27.0 or later.
Original description
The description as published by the source.
Denial of Service (CPU & Memory Exhaustion) via O(N^2) String Concatenation in Debian Package Upload
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-56755 has been found in code.gitea.io/gitea.
Attackers can target a specific entry point like control.tar.gz over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.2/10.
What to do: upgrade code.gitea.io/gitea to 1.27.0 or later.
If unsure, ask your IT team or search "code.gitea.io/gitea CVE-2026-56755" on the vendor's site.
CVE-2026-56755 (code.gitea.io/gitea) — CWE-409 / CVSS v3 6.2
Attack vector: local / unauthenticated / no user interaction
Attack surface: control.tar.gz / strings.Builder / TeeReader / DEFLATE
Patched: 1.27.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-409) exists in code.gitea.io/gitea. Attackers reach the vulnerable code path via control.tar.gz without authentication.
Check the vendor advisory for the affected versions of code.gitea.io/gitea. Attack surface: control.tar.gz / strings.Builder / TeeReader / DEFLATE.
Severity: Medium (CVSS 6.2/10). Risk of unauthorized operations or information disclosure.
Update to 1.27.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'code.gitea.io/gitea' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'code.gitea.io/gitea' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
code.gitea.io/giteaを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade code.gitea.io/gitea to 1.27.0ステージング環境で 1.27.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory github.com
- advisory blog.gitea.com
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com