7.5

CVE-2024-1135: HTTP Request Smuggling in benoitc/gunicorn

Deferred
AliasesMGASA-2024-0236SUSE-SU-2024:1440-1SUSE-SU-2024:2881-1
Published 16-04-2024Last modified 13-02-2025

Vulnerability summary

CVE-2024-1135 is a high (CVSS 7.5) vulnerability in benoitc benoitc/gunicorn. EPSS estimates a 3.00% chance of exploitation in the next 30 days, higher than 87.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 3% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.0 (CVE.org)
EPSS score
3.00%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
RHSA-2024:3781RHSA-2024:7987RHSA-2025:1335CGA-3R6V-5HCR-7H4MCGA-47Q9-2W9J-Q9GQCGA-F67W-874Q-WH5V

Timeline

  1. 16-04-2024
    PublishedVulnerability first disclosed.
  2. 13-02-2025
    Last modifiedVulnerability information updated.

Description

Gunicorn fails to properly validate Transfer-Encoding headers, leading to HTTP Request Smuggling (HRS) vulnerabilities. By crafting requests with conflicting Transfer-Encoding headers, attackers can bypass security restrictions and access restricted endpoints. This issue is due to Gunicorn's handling of Transfer-Encoding headers, where it incorrectly processes requests with multiple, conflicting Transfer-Encoding headers, treating them as chunked regardless of the final encoding specified. This vulnerability allows for a range of attacks including cache poisoning, session manipulation, and data exposure.

CVSS metrics

8 scores · 8 sources · 2 versions

EPSS trend

Probability

3.00%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

No change 0.00 pp

From 3.00% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard11 products
  • py3-gunicorn< 22.0.0-r0
  • py3-supported-gunicorn< 22.0.0-r0
  • py3.10-gunicorn< 22.0.0-r0
  • py3.10-gunicorn-bin< 22.0.0-r0
  • py3.11-gunicorn< 22.0.0-r0
Wolfi11 products
  • py3-gunicorn< 22.0.0-r0
  • py3-supported-gunicorn< 22.0.0-r0
  • py3.10-gunicorn< 22.0.0-r0
  • py3.10-gunicorn-bin< 22.0.0-r0
  • py3.11-gunicorn< 22.0.0-r0
Suse10 products
  • python-gunicorn&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS< 20.1.0-150400.12.6.1
  • python-gunicorn&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS< 20.1.0-150400.12.6.1
  • python-gunicorn&distro=SUSE Linux Enterprise Module for Public Cloud 15 SP2< 19.7.1-150000.3.7.1
  • python-gunicorn&distro=SUSE Linux Enterprise Module for Public Cloud 15 SP3< 19.7.1-150000.3.7.1
  • python-gunicorn&distro=SUSE Linux Enterprise Module for Public Cloud 15 SP4< 19.7.1-150000.3.7.1
Redhat2 products
  • python-gunicorn< 0:20.0.4-7.el9ost | < 0:19.9.0-11.el8ost
  • python3-gunicorn< 0:20.0.4-7.el9ost | < 0:19.9.0-11.el8ost
Benoitc1 product
Debian1 product
  • gunicorn< 19.9.0-1+deb10u1 | < 20.1.0-1+deb11u1 | < 20.1.0-6+deb12u1 | < 22.0.0-1
Mageia1 product
  • python-gunicorn< 22.0.0-1.mga9
Opensuse1 product
  • python-gunicorn&distro=openSUSE Leap 15.5< 19.7.1-150000.3.7.1 | < 20.1.0-150400.12.6.1
PyPI1 product
  • gunicorn< 22.0.0
Ubuntu1 product
  • gunicornAll versions (No fix recorded)

10 vendors · 40 products

References

28 links
Show all 28 references