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Fencer Vulns
high 7.5

CVE-2026-3805 json

use after free in SMB connection reuse

published 2026-03-11 7 mo ago modified 2026-09-15 55 d ago also EUVD-2026-11141 , GHSA-2289-hhfc-p684 , JLSEC-2026-439

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into already freed memory.

Patch / fix

  • julia CURL_jll 8.20.0+0
  • julia LibCURL_jll 8.19.0+0
  • curl curl 8.14.2, 8.16.1, 8.19.0
  • curl Debian 13 8.14.1-2+deb13u4
  • curl Debian 14 8.19.0-1

debian advisories DEBIAN-CVE-2026-3805

  • curl Ubuntu 25.10 8.14.1-2ubuntu1.2

ubuntu advisories UBUNTU-CVE-2026-3805

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • curl hummingbird 1 8.19.0-3.hum1
  • libcurl hummingbird 1 8.19.0-3.hum1
  • libcurl-minimal hummingbird 1 8.19.0-3.hum1

red hat advisories RHSA-2026:6893

  • curl SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 8.14.1-160000.5.1
  • curl-mini SLES for SAP applications 16.0, SLES 16.0 8.14.1-160000.5.1
  • curl SLES 15 SP5-LTSS, SLES 15 SP4-LTSS, SLE Micro 5.5 +8 more 8.14.1-150400.5.80.1
  • curl SLE Module for Basesystem 15 SP7 8.14.1-150700.7.14.1
  • curl SLES for SAP 15 SP6, SLES 15 SP6-LTSS, openSUSE Leap 15.6 8.14.1-150600.4.40.1
  • curl SLE Micro 5.2 8.14.1-150200.4.103.1
  • curl Linux Micro 6.1 8.14.1-slfo.1.1_6.1
  • curl Linux Micro 6.0 8.14.1-5.1

suse advisories SUSE-SU-2026:20760-1SUSE-SU-2026:20918-1SUSE-SU-2026:0911-1SUSE-SU-2026:0903-1SUSE-SU-2026:0885-1SUSE-SU-2026:0879-1

  • curl openSUSE Leap 16.0 8.14.1-160000.5.1
  • curl openSUSE Tumbleweed 8.19.0-1.1

opensuse advisories openSUSE-SU-2026:20404-1openSUSE-SU-2026:10371-1

  • curl Alpine 3.21 8.14.1-r3
  • curl Alpine 3.22 8.14.1-r4
  • curl Alpine 3.24, Alpine 3.23 8.19.0-r0

alpine advisories ALPINE-CVE-2026-3805

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-3805 updated cvss 6.3

curl: curl: Arbitrary code execution or Denial of Service via use-after-free in SMB request handling

  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9, openshift-sandboxed-containers/osc-rhel9-operator, openshift-sandboxed-containers/osc-operator-bundle, openshift-sandboxed-containers/osc-podvm-builder-rhel9, openshift-sandboxed-containers/osc-podvm-payload-rhel9, confidential-compute-attestation-tech-preview/trustee-rhel9 Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/vector-rhel9, openshift-logging/fluentd-rhel9, openshift-logging/eventrouter-rhel9, openshift-logging/logging-view-plugin-rhel9, openshift-logging/cluster-logging-rhel9-operator, openshift-logging/log-file-metric-exporter-rhel9, +1 more Red Hat Enterprise Linux 9 rust, cargo, clippy, rustfmt, snphost, rust-gdb, +10 more Red Hat Enterprise Linux 10 rust, snphost, trustee, s390utils, trustee-guest-components Red Hat Enterprise Linux AI (RHEL AI) 3 rust Red Hat JBoss Core Services curl
    +3 more products
    Red Hat OpenShift Container Platform 4 openshift4/recert-rhel9, openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Dev Spaces devspaces/code-rhel9 Red Hat Trusted Profile Analyzer rhtpa/rhtpa-trustification-service-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images curl 8.19.0-3.hum1, libcurl 8.19.0-3.hum1, libcurl-minimal 8.19.0-3.hum1
    fixed: vendor fix RHSA-2026:6893
  • Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl Red Hat Enterprise Linux 8 curl, libcurl, libcurl-minimal Red Hat Enterprise Linux 9 curl, libcurl, curl-minimal, libcurl-minimal Red Hat Enterprise Linux 10 curl
    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
7 mo ago

Exploit prediction

0.90% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/3591944 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 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
julia CURL_jll
>=8.13.0+0, <8.20.0+0
8.20.0+0
julia LibCURL_jll
>=8.13.0+0, <8.19.0+0
8.19.0+0

Affected products

  • curl curl

Classification

Weakness

References

Sources

Fencer Vulns 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.