7.5

CVE-2025-61770: rack Uncontrolled Resource Consumption

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2025-61770DEBIAN-CVE-2025-61770CGA-44rr-8gmm-xf22
Published 07-10-2025Last modified 07-10-2025
Open JSON

Vulnerability summary

CVE-2025-61770 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in rack. EPSS estimates a 0.93% chance of exploitation in the next 30 days, higher than 59.9% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.93%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 17 · Related 6
DLA-4357-1DSA-6048-1MGASA-2025-0334OPENSUSE-SU-2025:15621-1OPENSUSE-SU-2026:10286-1RHSA-2025:19512

Timeline

  1. 07-10-2025
    PublishedVulnerability first disclosed.
  2. 07-10-2025
    Last modifiedVulnerability information updated.

Description

Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing significant memory use and potential process termination due to out-of-memory (OOM) conditions. Remote attackers can trigger large transient memory spikes by including a long preamble in multipart/form-data requests. The impact scales with allowed request sizes and concurrency, potentially causing worker crashes or severe slowdown due to garbage collection. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a preamble size limit (e.g., 16 KiB) or discard preamble data entirely. Workarounds include limiting total request body size at the proxy or web server level and monitoring memory and set per-process limits to prevent OOM conditions.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.93%

Chance of exploitation in the next 30 days

Percentile

60%

Versus all other CVEs

30-day change

0.00 pp

From 0.93% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.93%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard50 products
  • gitlab-cng-18.2< 18.2.8-r0
  • gitlab-logger-18.2< 18.2.8-r0
  • gitlab-logger-18.3< 18.3.4-r0
  • gitlab-logger-18.4< 18.4.2-r0
  • gitlab-rails-ce-18.1< 18.1.6-r13
Wolfi5 products
  • gitlab-cng-18.2< 18.2.8-r0
  • ruby3.2-rack-2.2< 2.2.22-r0
  • ruby3.3-rack-2.2< 2.2.22-r0
  • ruby3.4-rack-2.2< 2.2.22-r0
  • ruby4.0-rack-2.2< 2.2.22-r0
Debian1 product
  • ruby-rack< 2.2.20-0+deb12u1 | < 3.1.18-1~deb13u1 | < 3.1.18-1
Rack1 product
  • rack≥ 3.1, < 3.1.17 | ≥ 3.2, < 3.2.2 | < 2.2.19 | ≥ 3.1.0, < 3.1.17 | ≥ 3.2.0, < 3.2.2
RubyGems1 product
  • rack< 2.2.19 | ≥ 3.1, < 3.1.17 | ≥ 3.2, < 3.2.2
Ubuntu1 product
  • ruby-rackAll versions (No fix recorded) | < 2.1.4-5ubuntu1.2 | < 2.2.7-1ubuntu0.5 | < 3.1.16-0.1ubuntu0.1

6 vendors · 59 products

References

12 links
Show all 12 references