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Vulnerability details: VCID-metf-cghw-p3b5
Vulnerability ID VCID-metf-cghw-p3b5
Aliases CVE-2026-34826
GHSA-x8cg-fq8g-mxfx
Summary Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Utils.get_byte_ranges parses the HTTP Range header without limiting the number of individual byte ranges. Although the existing fix for CVE-2024-26141 rejects ranges whose total byte coverage exceeds the file size, it does not restrict the count of ranges. An attacker can supply many small overlapping ranges such as 0-0,0-0,0-0,... to trigger disproportionate CPU, memory, I/O, and bandwidth consumption per request. This results in a denial of service condition in Rack file-serving paths that process multipart byte range responses. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-400 Uncontrolled Resource Consumption
CWE-770 Allocation of Resources Without Limits or Throttling
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-34826.json
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2026-34826
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2026-34826
epss 0.00051 https://api.first.org/data/v1/epss?cve=CVE-2026-34826
epss 0.00051 https://api.first.org/data/v1/epss?cve=CVE-2026-34826
epss 0.00051 https://api.first.org/data/v1/epss?cve=CVE-2026-34826
epss 0.00051 https://api.first.org/data/v1/epss?cve=CVE-2026-34826
epss 0.00051 https://api.first.org/data/v1/epss?cve=CVE-2026-34826
cvssv3.1 5.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-x8cg-fq8g-mxfx
cvssv3.1 5.3 https://github.com/rack/rack
generic_textual MODERATE https://github.com/rack/rack
cvssv3.1 5.3 https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx
cvssv3.1_qr MODERATE https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx
generic_textual MODERATE https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx
ssvc Track https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx
cvssv3.1 5.3 https://nvd.nist.gov/vuln/detail/CVE-2026-34826
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-34826
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-34826.json
https://api.first.org/data/v1/epss?cve=CVE-2026-34826
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-34826
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/rack/rack
https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx
https://nvd.nist.gov/vuln/detail/CVE-2026-34826
2454508 https://bugzilla.redhat.com/show_bug.cgi?id=2454508
GHSA-x8cg-fq8g-mxfx https://github.com/advisories/GHSA-x8cg-fq8g-mxfx
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-34826.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/rack/rack
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-02T18:42:34Z/ Found at https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2026-34826
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.11785
EPSS Score 0.00039
Published At April 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-03T07:52:21.353770+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.1.0