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Linux Distros Unpatched Vulnerability : CVE-2026-49265

🗓️ 21 Oct 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 1 Views

Timing information leak in OAuthLib PKCE checks allows code_verifier recovery.

Related
Refs
Code
ReporterTitlePublishedViews
Family
cgr
Chainguard
CVE-2026-49265 vulnerabilities
30 Sep 202620:54
–cgr
circl
Circl
CVE-2026-49265
28 Sep 202609:17
–circl
cnnvd
CNNVD
oauthlib side-channel information leakage vulnerability
12 Oct 202616:00
–cnnvd
cve
CVE
CVE-2026-49265
13 Oct 202615:47
–cve
cvelist
Cvelist
CVE-2026-49265 OAuthLib: Timing Attack Vulnerability in PKCE code_verifier Comparison
13 Oct 202615:47
–cvelist
debiancve
Debian CVE
CVE-2026-49265
13 Oct 202615:47
–debiancve
euvd
EUVD
EUVD-2026-98833
13 Oct 202615:47
–euvd
github
Github Security Blog
Oauthlib: Timing Attack Vulnerability in PKCE code_verifier Comparison (CWE-208)
29 Sep 202617:56
–github
mend
Mend
CVE-2026-49265
29 Sep 202619:44
–mend
mscve
Microsoft CVE
OAuthLib: Timing Attack Vulnerability in PKCE code_verifier Comparison
15 Oct 202608:10
–mscve
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
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  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 3.0.0 until 4.0.0,
    OAuthLib's PKCE checks in oauthlib/oauth2/rfc6749/grant_types/authorization_code.py compare attacker-
    supplied code_verifier values with stored challenges using ordinary string equality in
    code_challenge_method_plain and code_challenge_method_s256. Because the comparison can return after a
    length difference or the first mismatching character, repeated token endpoint measurements can reveal
    common-prefix timing information that could potentially allow recovery of the code_verifier, unauthorized
    access-token acquisition, and account takeover. Practical exploitation requires an intercepted, single-use
    authorization code and enough measurements to overcome real-world network noise; the local timing
    benchmark does not establish practical remote account takeover, so the weakness remains a defense-in-depth
    concern. This issue is fixed in version 4.0.0. (CVE-2026-49265)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-gce");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-heuristics-ping");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-ilo-ssh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-ilo2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-intelmodular");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-lpar");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-rhevm");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-rsb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-sbd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-scsi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-virsh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-vmware-rest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-vmware-soap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-wti");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-zvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd-cpg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd-libvirt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd-multicast");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd-serial");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd-tcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ha-cloud-support");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-oauthlib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-oauthlib");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:fence-agents-gce");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:fence-agents-heuristics-ping");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:fence-agents-hpblade");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:fence-agents-ibm-powervs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:fence-agents-ibm-vpc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:fence-agents-ibmblade");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:fence-agents-ifmib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:fence-agents-ilo-moonshot");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python3-oauthlib");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/CentOS Linux-8", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-26.04");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "python-oauthlib"},
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "python-oauthlib"},
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "fence-agents"},
          {"reference": "fence-agents-aliyun"},
          {"reference": "fence-agents-all"},
          {"reference": "fence-agents-amt-ws"},
          {"reference": "fence-agents-apc"},
          {"reference": "fence-agents-apc-snmp"},
          {"reference": "fence-agents-aws"},
          {"reference": "fence-agents-azure-arm"},
          {"reference": "fence-agents-bladecenter"},
          {"reference": "fence-agents-brocade"},
          {"reference": "fence-agents-cisco-mds"},
          {"reference": "fence-agents-cisco-ucs"},
          {"reference": "fence-agents-common"},
          {"reference": "fence-agents-compute"},
          {"reference": "fence-agents-drac5"},
          {"reference": "fence-agents-eaton-snmp"},
          {"reference": "fence-agents-emerson"},
          {"reference": "fence-agents-eps"},
          {"reference": "fence-agents-gce"},
          {"reference": "fence-agents-heuristics-ping"},
          {"reference": "fence-agents-hpblade"},
          {"reference": "fence-agents-ibm-powervs"},
          {"reference": "fence-agents-ibm-vpc"},
          {"reference": "fence-agents-ibmblade"},
          {"reference": "fence-agents-ifmib"},
          {"reference": "fence-agents-ilo-moonshot"},
          {"reference": "fence-agents-ilo-mp"},
          {"reference": "fence-agents-ilo-ssh"},
          {"reference": "fence-agents-ilo2"},
          {"reference": "fence-agents-intelmodular"},
          {"reference": "fence-agents-ipdu"},
          {"reference": "fence-agents-ipmilan"},
          {"reference": "fence-agents-kdump"},
          {"reference": "fence-agents-kubevirt"},
          {"reference": "fence-agents-lpar"},
          {"reference": "fence-agents-mpath"},
          {"reference": "fence-agents-nutanix-ahv"},
          {"reference": "fence-agents-openstack"},
          {"reference": "fence-agents-redfish"},
          {"reference": "fence-agents-rhevm"},
          {"reference": "fence-agents-rsa"},
          {"reference": "fence-agents-rsb"},
          {"reference": "fence-agents-sbd"},
          {"reference": "fence-agents-scsi"},
          {"reference": "fence-agents-virsh"},
          {"reference": "fence-agents-vmware-rest"},
          {"reference": "fence-agents-vmware-soap"},
          {"reference": "fence-agents-wti"},
          {"reference": "fence-agents-zvm"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "fence-agents"},
          {"reference": "fence-agents-aliyun"},
          {"reference": "fence-agents-all"},
          {"reference": "fence-agents-amt-ws"},
          {"reference": "fence-agents-apc"},
          {"reference": "fence-agents-apc-snmp"},
          {"reference": "fence-agents-aws"},
          {"reference": "fence-agents-azure-arm"},
          {"reference": "fence-agents-bladecenter"},
          {"reference": "fence-agents-brocade"},
          {"reference": "fence-agents-cisco-mds"},
          {"reference": "fence-agents-cisco-ucs"},
          {"reference": "fence-agents-common"},
          {"reference": "fence-agents-compute"},
          {"reference": "fence-agents-drac5"},
          {"reference": "fence-agents-eaton-snmp"},
          {"reference": "fence-agents-emerson"},
          {"reference": "fence-agents-eps"},
          {"reference": "fence-agents-gce"},
          {"reference": "fence-agents-heuristics-ping"},
          {"reference": "fence-agents-hpblade"},
          {"reference": "fence-agents-ibm-powervs"},
          {"reference": "fence-agents-ibm-vpc"},
          {"reference": "fence-agents-ibmblade"},
          {"reference": "fence-agents-ifmib"},
          {"reference": "fence-agents-ilo-moonshot"},
          {"reference": "fence-agents-ilo-mp"},
          {"reference": "fence-agents-ilo-ssh"},
          {"reference": "fence-agents-ilo2"},
          {"reference": "fence-agents-intelmodular"},
          {"reference": "fence-agents-ipdu"},
          {"reference": "fence-agents-ipmilan"},
          {"reference": "fence-agents-kdump"},
          {"reference": "fence-agents-kubevirt"},
          {"reference": "fence-agents-lpar"},
          {"reference": "fence-agents-mpath"},
          {"reference": "fence-agents-nutanix-ahv"},
          {"reference": "fence-agents-openstack"},
          {"reference": "fence-agents-redfish"},
          {"reference": "fence-agents-rhevm"},
          {"reference": "fence-agents-rsa"},
          {"reference": "fence-agents-rsb"},
          {"reference": "fence-agents-sbd"},
          {"reference": "fence-agents-scsi"},
          {"reference": "fence-agents-virsh"},
          {"reference": "fence-agents-vmware-rest"},
          {"reference": "fence-agents-vmware-soap"},
          {"reference": "fence-agents-wti"},
          {"reference": "fence-agents-zvm"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "fence-agents"},
          {"reference": "fence-agents-aliyun"},
          {"reference": "fence-agents-all"},
          {"reference": "fence-agents-amt-ws"},
          {"reference": "fence-agents-apc"},
          {"reference": "fence-agents-apc-snmp"},
          {"reference": "fence-agents-aws"},
          {"reference": "fence-agents-azure-arm"},
          {"reference": "fence-agents-bladecenter"},
          {"reference": "fence-agents-brocade"},
          {"reference": "fence-agents-cisco-mds"},
          {"reference": "fence-agents-cisco-ucs"},
          {"reference": "fence-agents-common"},
          {"reference": "fence-agents-compute"},
          {"reference": "fence-agents-drac5"},
          {"reference": "fence-agents-eaton-snmp"},
          {"reference": "fence-agents-emerson"},
          {"reference": "fence-agents-eps"},
          {"reference": "fence-agents-gce"},
          {"reference": "fence-agents-heuristics-ping"},
          {"reference": "fence-agents-hpblade"},
          {"reference": "fence-agents-ibm-powervs"},
          {"reference": "fence-agents-ibm-vpc"},
          {"reference": "fence-agents-ibmblade"},
          {"reference": "fence-agents-ifmib"},
          {"reference": "fence-agents-ilo-moonshot"},
          {"reference": "fence-agents-ilo-mp"},
          {"reference": "fence-agents-ilo-ssh"},
          {"reference": "fence-agents-ilo2"},
          {"reference": "fence-agents-intelmodular"},
          {"reference": "fence-agents-ipdu"},
          {"reference": "fence-agents-ipmilan"},
          {"reference": "fence-agents-kdump"},
          {"reference": "fence-agents-kubevirt"},
          {"reference": "fence-agents-lpar"},
          {"reference": "fence-agents-mpath"},
          {"reference": "fence-agents-nutanix-ahv"},
          {"reference": "fence-agents-openstack"},
          {"reference": "fence-agents-redfish"},
          {"reference": "fence-agents-rhevm"},
          {"reference": "fence-agents-rsa"},
          {"reference": "fence-agents-rsb"},
          {"reference": "fence-agents-sbd"},
          {"reference": "fence-agents-scsi"},
          {"reference": "fence-agents-virsh"},
          {"reference": "fence-agents-vmware-rest"},
          {"reference": "fence-agents-vmware-soap"},
          {"reference": "fence-agents-wti"},
          {"reference": "fence-agents-zvm"},
          {"reference": "fence-virt"},
          {"reference": "fence-virtd"},
          {"reference": "fence-virtd-cpg"},
          {"reference": "fence-virtd-libvirt"},
          {"reference": "fence-virtd-multicast"},
          {"reference": "fence-virtd-serial"},
          {"reference": "fence-virtd-tcp"},
          {"reference": "ha-cloud-support"},
          {"reference": "python3-oauthlib"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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22 Oct 2026 00:00Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.16.8
EPSS0.00375
SSVC
1