CVE-2026-34830

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Source
https://cve.org/CVERecord?id=CVE-2026-34830
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34830.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-34830
Aliases
Downstream
Related
Published
2026-04-02T16:47:40.490Z
Modified
2026-07-15T01:49:12.921675584Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
Rack: Rack::Sendfile regex injection via HTTP_X_ACCEL_MAPPING header allows arbitrary file reads through nginx
Details

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Sendfile#mapaccelpath interpolates the value of the X-Accel-Mapping request header directly into a regular expression when rewriting file paths for X-Accel-Redirect. Because the header value is not escaped, an attacker who can supply X-Accel-Mapping to the backend can inject regex metacharacters and control the generated X-Accel-Redirect response header. In deployments using Rack::Sendfile with x-accel-redirect, this can allow an attacker to cause nginx to serve unintended files from configured internal locations. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

Database specific 
{
    "cwe_ids": [
        "CWE-625"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34830.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/rack/rack

Affected ranges

Type
GIT
Repo
https://github.com/rack/rack
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
f2af0c8f869193fa7bb7d20b619b3003418e1055
Introduced
52901caf09ebcda879512a8605059963a49df55d
Fixed
ae8431120e66e92d1885ab8ec0a553d9cad5ec13
Introduced
b68251c03788ff39d4a4b25424df7360426e4afd
Fixed
e1f22fdbe99afd2126b6fbf05bb12399359574b7
Database specific 
{
    "cpe": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.2.23"
        },
        {
            "introduced": "3.0.0"
        },
        {
            "fixed": "3.1.21"
        },
        {
            "introduced": "3.2.0"
        },
        {
            "fixed": "3.2.6"
        }
    ],
    "source": "CPE_RANGE"
}

Affected versions

0.*
0.1
0.2
0.3
1.*
1.0
1.3.0
1.3.0.beta
1.3.0.beta2
1.4.0
1.4.1
1.5.0
1.5.1
1.6.0.beta
2.*
2.0.0
2.0.0.alpha
2.0.0.rc1
2.0.1
2.1.0
2.2.0
2.2.3
2.2.4
3.*
3.0.0
v2.*
v2.2.1
v2.2.10
v2.2.11
v2.2.12
v2.2.13
v2.2.14
v2.2.15
v2.2.16
v2.2.17
v2.2.18
v2.2.19
v2.2.2
v2.2.20
v2.2.21
v2.2.22
v2.2.5
v2.2.6
v2.2.6.1
v2.2.6.2
v2.2.7
v2.2.8
v2.2.9
v3.*
v3.1.0
v3.1.10
v3.1.11
v3.1.12
v3.1.13
v3.1.14
v3.1.15
v3.1.16
v3.1.17
v3.1.18
v3.1.19
v3.1.2
v3.1.20
v3.1.3
v3.1.4
v3.1.5
v3.1.6
v3.1.7
v3.1.8
v3.1.9
v3.2.0
v3.2.1
v3.2.2
v3.2.3
v3.2.4
v3.2.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34830.json"