CVE-2026-58436: gitea gitea open source git server Inefficient Algorithmic Complexity
CVSS: 7.5v3.1HighDeferred
AliasesGHSA-fw57-jgch-pgf3GO-2026-6055
Published 13-08-2026Last modified 14-08-2026
Vulnerability summary
CVE-2026-58436 is a high (CVSS 7.5) Inefficient Algorithmic Complexity vulnerability in gitea gitea open source git server. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.1% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.61%
0%100%
Low · +0.27 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 13-08-2026PublishedVulnerability first disclosed.
- 14-08-2026Last modifiedVulnerability information updated.
Description
ParseAcceptLanguage quadratic-time DoS via Locale middleware on unauthenticated requests
CVSS metrics
3 scores · 3 sources · 2 versionsHigh 8.7Preferred score · OSV · Go (Ecosystem advisory) · calculated from vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NSourcesSingle source
High 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 2 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.61%
Chance of exploitation in the next 30 days
Percentile
48%
Versus all other CVEs
30-day change
+0.27 pp
From 0.34% on 19-09-2026
19-09-202619-10-2026
EPSS score0.61%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-407Inefficient Algorithmic ComplexityAn algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
- CWE-1333Inefficient Regular Expression ComplexityThe product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.
Affected systems
Code.gitea.io1 product
- gitea< 1.27.0
Gitea1 product
- gitea open source git server≤ 1.26.4
Go1 product
- gitea.dev< 1.27.0
3 vendors · 3 products
References
6 links- github.com/go-gitea/gitea/releases/tag/v1.27.0Release Notes
- blog.gitea.com/gitea-1.27.0-is-released/Release Notes
- github.com/go-gitea/giteaPACKAGE