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NVD / CVE Program· CNA GitHub_M

CVE-2024-26146: Possible Denial of Service Vulnerability in Rack Header Parsing

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.9% (FIRST EPSS); higher than 80.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: rack rack 2.0.9.4.
  • Severity is disputed: the assigning authority (CNA) scores it 5.3, NVD 7.5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to rack rack 2.0.9.4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Rack is a modular Ruby web server interface. Carefully crafted headers can cause header parsing in Rack to take longer than expected resulting in a possible denial of service issue. Accept and Forwarded headers are impacted. Ruby 3.2 has mitigations for this problem, so Rack applications using Ruby 3.2 or newer are unaffected. This vulnerability is fixed in 2.0.9.4, 2.1.4.4, 2.2.8.1, and 3.0.9.1.

Published
Feb 28, 2024
Updated
Jun 17, 2026
EPSS
1.9% · 80th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.9%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · GitHub_M
5.3
2.2 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-26146

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
rackrack
debiandebian linux

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • rack rack

    • >= 3.0.0, < 3.0.9.1, >= 2.2.0, < 2.2.8.1, >= 2.1.0, < 2.1.4.4, < 2.0.9.4affected
Affected versions · NVD (4)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • rack rack0.4 and later · before 2.0.9.4
  • rack rack2.1.0 and later · before 2.1.4.4
  • rack rack2.2.0 and later · before 2.2.8.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8pcsbefore 0.10.18-2.el8_100.10.18-2.el8_10
AlmaLinux:8pcs-snmpbefore 0.10.18-2.el8_100.10.18-2.el8_10
AlmaLinux:9pcsbefore 0.11.7-2.el9_40.11.7-2.el9_4
AlmaLinux:9pcs-snmpbefore 0.11.7-2.el9_40.11.7-2.el9_4
Debian:10ruby-rackbefore 2.0.6-3+deb10u42.0.6-3+deb10u4
Debian:11ruby-rackbefore 2.1.4-3+deb11u22.1.4-3+deb11u2
Debian:12ruby-rackbefore 2.2.6.4-1+deb12u12.2.6.4-1+deb12u1
Debian:13ruby-rackbefore 2.2.7-1.12.2.7-1.1
openSUSE:Leap 15.5rubygem-rackbefore 2.0.8-150000.3.21.22.0.8-150000.3.21.2
openSUSE:Tumbleweedrubygem-rackbefore 3.1.18-1.33.1.18-1.3
openSUSE:Tumbleweedrubygem-rackbefore 3.1.12-1.13.1.12-1.1
openSUSE:Tumbleweedrubygem-rackbefore 3.0.9.1-1.13.0.9.1-1.1
openSUSE:Tumbleweedrubygem-rack-2.2before 2.2.22-1.12.2.22-1.1
openSUSE:Tumbleweedrubygem-rack-2.2before 2.2.11-1.12.2.11-1.1
openSUSE:Tumbleweedrubygem-rack-2.2before 2.2.8.1-1.12.2.8.1-1.1
Red Hat:enterprise_linux:8::highavailabilitypcsbefore 0:0.10.18-2.el8_100:0.10.18-2.el8_10
Red Hat:enterprise_linux:8::highavailabilitypcs-snmpbefore 0:0.10.18-2.el8_100:0.10.18-2.el8_10
Red Hat:enterprise_linux:9::highavailabilitypcsbefore 0:0.11.7-2.el9_40:0.11.7-2.el9_4
Red Hat:enterprise_linux:9::highavailabilitypcs-snmpbefore 0:0.11.7-2.el9_40:0.11.7-2.el9_4
Red Hat:rhel_aus:8.4::highavailabilitypcsbefore 0:0.10.8-1.el8_4.50:0.10.8-1.el8_4.5
Red Hat:rhel_aus:8.4::highavailabilitypcs-snmpbefore 0:0.10.8-1.el8_4.50:0.10.8-1.el8_4.5
Red Hat:rhel_e4s:8.2::highavailabilitypcsbefore 0:0.10.4-6.el8_2.50:0.10.4-6.el8_2.5
Red Hat:rhel_e4s:8.2::highavailabilitypcs-snmpbefore 0:0.10.4-6.el8_2.50:0.10.4-6.el8_2.5
Red Hat:rhel_eus:8.6::highavailabilitypcsbefore 0:0.10.12-6.el8_6.50:0.10.12-6.el8_6.5

+19

Same product

rack: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-25126Rack ReDos in content type parsing (2nd degree polynomial)
    41Plan
  • CVE-2023-27530A DoS vulnerability exists in Rack <v3.0.4.2, <v2.2.6.3, <v2.1.4.3 and <v2.0.9.3 within in the Multipart MIME parsing code in which could…
    31Monitor
  • CVE-2026-125111Rack: Multipart parsing allows DoS via unbounded scan buffer growth
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2022-44572Feb 9, 2023 · A denial of service vulnerability in the multipart parsing component of Rack fixed in 2.0.9.2, 2.1.4.2, 2.2.4.1 and 3.0.0.1 could allow an…
    30Monitor
  • ← EarlierCVE-2024-26141Feb 28, 2024 · Possible DoS Vulnerability with Range Header in Rack
    30Monitor
  • Later →CVE-2024-39316Jul 2, 2024 · Rack ReDoS Vulnerability in HTTP Accept Headers Parsing
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
rack rack2.0.9.4 · descriptionVendor (CNA)
almalinux:pcs0.11.7-2.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:pcs-snmp0.11.7-2.el9_4 · AlmaLinux:9Package registry (OSV)
debian:ruby-rack2.2.6.4-1+deb12u1 · Debian:12Package registry (OSV)
opensuse:rubygem-rack2.0.8-150000.3.21.2 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:rubygem-rack-2.22.2.8.1-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:pcs0:0.11.1-10.el9_0.5 · Red Hat:rhel_eus:9.0::highavailabilityPackage registry (OSV)
red hat:pcs-snmp0:0.11.1-10.el9_0.5 · Red Hat:rhel_eus:9.0::highavailabilityPackage registry (OSV)
red hat:python-pulp-container0:2.16.9-2.el8pc · Red Hat:satellite_capsule:6.15::el8Package registry (OSV)
red hat:python3.11-pulp-container0:2.16.9-2.el8pc · Red Hat:satellite_capsule:6.15::el8Package registry (OSV)
red hat:rubygem-activestorage0:6.1.7.7-1.el8sat · Red Hat:satellite:6.15::el8Package registry (OSV)
red hat:rubygem-rack0:2.2.8.1-1.el8sat · Red Hat:satellite_capsule:6.15::el8Package registry (OSV)
rocky linux:pcs0:0.10.18-2.el8_10 · Rocky Linux:8Package registry (OSV)
RubyGems:rack2.0.9.4Package registry (OSV)
RubyGems:rack2.1.4.4Package registry (OSV)
RubyGems:rack2.2.8.1Package registry (OSV)
RubyGems:rack3.0.9.1Package registry (OSV)
suse:rubygem-rack2.0.8-150000.3.21.2 · SUSE:Linux Enterprise High Availability Extension 15 SP2Package registry (OSV)
suse:rubygem-rack-1_41.4.5-9.3.1 · SUSE:Linux Enterprise Module for Containers 12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-251260 days apartRack ReDos in content type parsing (2nd degree polynomial)
    41Plan
  • CVE-2024-39316125 days apartRack ReDoS Vulnerability in HTTP Accept Headers Parsing
    26Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-1333 · Inefficient Regular Expression Complexity

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records