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No exploitation reportedFix available

CVE-2026-44432

No exploitation reported by the sources we read.

  • Published2026-05-13
  • Fixed in2.7.0
  • WeaknessCWE-409

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.

Timeline

dates in UTC
  1. 2026-05-1316:16CVE publishedNVD

Versions per branch

NVD · OSV
Python urllib3
BranchAffectedFixed in
2.x≥ 2.6.0, < 2.7.02.7.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • urllib3
    Affected
    • = >= 2.6.0, < 2.7.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-05-13

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • airflow-2MinimOSall versions · no fixed version listedand 4 other packages
  • airflow-2CleanStartall versions · fixed in 2.11.2-r1
  • airflow-2Chainguardall versions · fixed in 2.11.2-r26
  • airflow-3Wolfiall versions · fixed in 3.2.1-r4
  • airflow-3MinimOSall versions · fixed in 3.2.2-r0
  • airflow-3CleanStartall versions · fixed in 3.1.8-r3
  • airflow-3CleanStartall versions · fixed in 3.2.0-r0
  • airflow-3Chainguardall versions · fixed in 3.2.1-r4

307 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-44432 Red Hat Product Security578 products fixed · 24 known affected

    urllib3: urllib3: Denial of Service due to excessive HTTP response decompression

    openshift-lightspeed/lightspeed-service-api-rhel9 as a component of OpenShift Lightspeed · openshift-lightspeed/lightspeed-to-dataverse-exporter-rhel9 as a component of OpenShift Lightspeed · pen-drive/pen-drive-scanner-rhel9 as a component of Pen Drive Powered by Red Hat Lightspeed · +21 more

  • RHSA-2026:92281 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.19.54 security and extras update

  • RHSA-2026:92284 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.20.45 security and extras update

  • RHSA-2026:92452 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.5.2 enhancement update

  • RHSA-2026:92449 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.5.2 enhancement update

  • RHSA-2026:87410 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI

84 more advisories

Full record on NVD

Fix

  1. Update Python urllib3 to 2.7.0
  2. Vendor fix Red Hat Product Security RHSA-2026:92281 · 4 productsSee the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/ Details on how…
  3. Vendor fix Red Hat Product Security RHSA-2026:92284 · 4 productsSee the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/release_notes/ Details on how…
  4. Vendor fix Red Hat Product Security RHSA-2026:92452 · 7 productsThe container images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command. For details on deploying and configuring RHEL AI, see the Red Hat Enterprise Linux AI documentation at https://docs.redhat.com/en/documentation/…
  5. Vendor fix Red Hat Product Security RHSA-2026:92449 · 1 productThe container disk images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command, for use with OpenShift Virtualization. For details on deploying and configuring RHEL AI, see the Red Hat Enterprise Linux AI documentation …
  6. Vendor fix Red Hat Product Security RHSA-2026:87410 · 16 productsFor Red Hat OpenShift AI 2.25.12 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  7. Vendor fix Red Hat Product Security RHSA-2026:83703 · 4 productsSee the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/ Details on how…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-05-15
  • CNACVSS 4.08.9known since 2026-10-23
  • CNACVSS 3.17.5known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-409known since 2026-10-23
  • FIRST EPSSEPSS score0.7 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-05-11

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-05-13
Last Modified
2026-09-10
NVD status
Modified
GitHub Advisory
GHSA-mf9v-mfxr-j63j

Frequently asked questions

What is CVE-2026-44432?

urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.

Is CVE-2026-44432 actively exploited?

Active exploitation of CVE-2026-44432 has not been confirmed. Its EPSS score was 0.7% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-44432?

CVE-2026-44432 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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