7.5

CVE-2026-47736: puma Uncontrolled Resource Consumption

CVSS: 7.5v3.1HighDeferred
AliasesUBUNTU-CVE-2026-47736DEBIAN-CVE-2026-47736CGA-5m8f-7425-9qfh
Published 14-07-2026Last modified 15-07-2026
Open JSON

Vulnerability summary

CVE-2026-47736 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in puma. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 26.7% 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
0.35%
0%100%
Low · -0.28 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-PHC7-6966-MF2P

Timeline

  1. 14-07-2026
    PublishedVulnerability first disclosed.
  2. 15-07-2026
    Last modifiedVulnerability information updated.

Description

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, when PROXY protocol v1 support is enabled, Puma reads incoming bytes into an internal buffer while waiting for CRLF to determine whether a PROXY v1 line is present, allowing an attacker that continuously sends bytes without CRLF to cause unbounded in-process memory growth and additional CPU cost from repeatedly scanning the growing buffer. This issue is fixed in versions 7.2.1 and 8.0.2.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

-0.28 pp

From 0.63% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.35%

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

Chainguard40 products
  • gitlab-exporter-18.10< 18.10.8-r1
  • gitlab-exporter-18.11< 18.11.6-r2
  • gitlab-exporter-19.0< 19.0.0-r2
  • gitlab-exporter-19.1< 19.1.1-r1
  • gitlab-rails-ce-18.1All versions (No fix recorded)
Wolfi4 products
  • logstash-9.3< 9.3.7-r0
  • logstash-9.3-iamguarded-compat< 9.3.7-r0
  • logstash-9.4< 9.4.4-r0
  • logstash-9.4-iamguarded-compat< 9.4.4-r0
Debian1 product
  • puma< 5.6.5-3+deb12u2 | All versions (No fix recorded) | < 8.0.2-1
Puma1 product
  • puma≥ 5.5.0, < 7.2.1 | ≥ 8.0.0, < 8.0.2
RubyGems1 product
  • puma≥ 8.0.0, < 8.0.2 | ≥ 5.5.0, < 7.2.1
Ubuntu1 product
  • pumaAll versions (No fix recorded)

6 vendors · 48 products

References

12 links
Show all 12 references