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Fencer Intel
high 7.5

CVE-2026-49476 json

Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve

published 5mo ago modified 18d ago also EUVD-2026-44539 , GHSA-2wc2-fm75-p42x , PYSEC-2026-3071

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup .select() / .select_one() to allocate hundreds of megabytes of heap memory from a relatively small input and cause denial of service. This issue is fixed in version 2.8.4.

Patch / fix

  • pypi soupsieve 2.8.4
  • facelessuser soup_sieve 2.8.4
  • soupsieve Debian 14 2.8.4-1

debian advisories DEBIAN-CVE-2026-49476

  • python-rpds-py hummingbird 1 2026.6.3-1.hum1
  • python3-rpds-py hummingbird 1 2026.6.3-1.hum1

red hat advisories RHSA-2026:34119

  • python-soupsieve SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Python 3 15 SP7 2.5-150600.3.3.1
  • python-soupsieve SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.9.5-150200.3.3.1
  • python-soupsieve SLES for SAP applications 16.0, SLES 16.0 2.6-160000.4.1

suse advisories SUSE-SU-2026:3240-1SUSE-SU-2026:3239-1SUSE-SU-2026:22660-1

  • python-soupsieve openSUSE Leap 16.0 2.6-160000.4.1

opensuse advisories openSUSE-SU-2026:21342-1

Is CVE-2026-49476 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-49476 updated cvss 5.9

python-soupsieve: Soupsieve: Denial of Service via crafted CSS selector string

  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9, lightspeed-core/rag-tool-cuda-12.9-rhel9 Red Hat Migration Toolkit for Applications 8 mta/mta-solution-server-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9 Red Hat Ansible Automation Platform 2 ansible-automation-platform-25/lightspeed-chatbot-rhel8
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 openshift4/ose-olm-catalogd-rhel9, python-soupsieve 2.1.0-3.el9ocp.2 Red Hat OpenShift Virtualization 4 container-native-virtualization/ocp-virt-validation-checkup-rhel9 Red Hat OpenStack Platform 17.1 python3-soupsieve Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9 Red Hat Satellite 6 python-soupsieve 2.1.0-3.el9ocp.2
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images python-rpds-py 2026.6.3-1.hum1, python3-rpds-py 2026.6.3-1.hum1
    fixed: vendor fix RHSA-2026:34119
  • Red Hat OpenShift AI 3.4 rhoai/odh-th06-cpu-torch210-py312-rhel9 1787076778, rhoai/odh-th06-rocm64-torch291-py312-rhel9 1787076481, rhoai/odh-th06-cuda130-torch210-py312-rhel9 1787077779, rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9 1787073936, rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9 1787073873, rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9 1787073611, +13 more
    fixed: vendor fix RHSA-2026:60520
  • Red Hat Hardened Images python-attrs 26.1.0-3.hum1, python-urllib3 2.7.0-3.hum1
    not affected: component not present
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-automl-rhel9, rhoai/odh-autorag-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-cuda130-torch291-py312-rhel9, rhoai/odh-trustyai-nemo-guardrails-server-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1787330837, rhoai/rhai-cli-rhel9 1787330837, rhoai/odh-automl-rhel9 1786612415, rhoai/odh-mlflow-rhel9 1787226790, rhoai/odh-autorag-rhel9 1786612637, rhoai/odh-trainer-rhel9 1787089049, +81 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.64% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi soupsieve
<2.8.4
2.8.4

Affected products

  • facelessuser soupsieve

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of facelessuser/soupsieve published their own advisory on GitHub. Reviewed sources take precedence over it.