7.5

CVE-2024-3651: Denial of Service via Quadratic Complexity in kjd/idna

Modified
AliasesALPINE-CVE-2024-3651MGASA-2024-0245SUSE-SU-2024:1428-1
Published 07-07-2024Last modified 04-11-2025

Vulnerability summary

CVE-2024-3651 is a high (CVSS 7.5) vulnerability in kjd internationalized_domain_names_in_applications. EPSS estimates a 1.39% chance of exploitation in the next 30 days, higher than 72.2% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 6.2, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.39%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 7 · Related 28
RHSA-2024:3466RHSA-2024:3781SUSE-EL-9-CLIENT-TOOLS-2024-4029SUSE-SU-2024:4020-1SUSE-SU-2024:4021-1SUSE-SU-2024:4029-1

Timeline

  1. 07-07-2024
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

Description

A vulnerability was identified in the kjd/idna library, specifically within the `idna.encode()` function, affecting version 3.6. The issue arises from the function's handling of crafted input strings, which can lead to quadratic complexity and consequently, a denial of service condition. This vulnerability is triggered by a crafted input that causes the `idna.encode()` function to process the input with considerable computational load, significantly increasing the processing time in a quadratic manner relative to the input size.

CVSS metrics

11 scores · 9 sources · 2 versions

EPSS trend

Probability

1.39%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.39% 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

1 found
  • referenceUnverified

    Exploit Reference (huntr.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard71 products
  • az< 2.60.0-r0
  • az-iamguarded-compat< 2.60.0-r0
  • checkov< 3.0.34-r1
  • confluent-docker-utils< 0.0.76-r0
  • dask-gateway< 2024.1.0-r4
Wolfi65 products
  • az< 2.60.0-r0
  • az-iamguarded-compat< 2.60.0-r0
  • checkov< 3.0.34-r1
  • confluent-docker-utils< 0.0.76-r0
  • dask-gateway< 2024.1.0-r4
Suse12 products
  • python-idna&distro=SUSE Linux Enterprise Micro 5.1< 2.6-150000.3.3.1
  • python-idna&distro=SUSE Linux Enterprise Micro 5.2< 2.6-150000.3.3.1
  • python-idna&distro=SUSE Linux Enterprise Micro 5.3< 2.6-150000.3.3.1
  • python-idna&distro=SUSE Linux Enterprise Micro 5.4< 2.6-150000.3.3.1
  • python-idna&distro=SUSE Linux Enterprise Micro 5.5< 2.6-150000.3.3.1
Opensuse5 products
  • python-idna&distro=openSUSE Leap 15.5< 3.4-150400.11.10.1 | < 2.6-150000.3.3.1
  • python-idna&distro=openSUSE Leap 15.6< 3.4-150400.11.10.1
  • python-idna&distro=openSUSE Leap Micro 5.3< 2.6-150000.3.3.1
  • python-idna&distro=openSUSE Leap Micro 5.4< 2.6-150000.3.3.1
  • python-idna&distro=openSUSE Tumbleweed< 3.7-1.1 | < 3.19-1.1
Kjd2 products
Redhat2 products
  • python-idna< 0:2.5-5.el8_8.1 | < 0:2.5-5.el8_6.1 | < 0:2.10-7.el9_4.1 | < 0:2.5-7.el8_10 | < 0:2.4-2.el7_9
  • python3-idna< 0:2.5-5.el8_8.1 | < 0:2.5-5.el8_6.1 | < 0:2.10-7.el9_4.1 | < 0:2.5-7.el8_10
Ubuntu2 products
  • python-idna< 2.0-3ubuntu0.1~esm1 | < 2.6-1ubuntu0.1~esm1 | < 2.8-1ubuntu0.1 | < 3.3-1ubuntu0.1 | < 3.6-2ubuntu0.1
  • python-pip< 8.1.1-2ubuntu0.6+esm8 | < 9.0.1-2.3~ubuntu1.18.04.8+esm4 | < 20.0.2-5ubuntu1.10+esm2 | < 22.0.2+dfsg-1ubuntu0.7 | < 24.0+dfsg-1ubuntu1.3
Alpine1 product
  • py3-idna< 3.7-r0
Debian1 product
  • python-idna< 2.6-1+deb10u1 | < 3.3-1+deb12u1 | < 3.6-2.1
Mageia1 product
  • python-idna< 3.7-1.mga9
PyPI1 product
  • idna< 3.7 | < 1d365e17e10d72d0b7876316fc7b9ca0eebdd38d | ≥ 0.1, < 3.7

11 vendors · 163 products

References

45 links
Show all 45 references