CVE Feed

    Dashboard / CVE / CVE-2026-4786

    CVE-2026-4786

    Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the mitigation could be bypassed for certain browser types the "webbrowser.open()" API could have commands injected into the underlying shell. See CVE-2026-4519 for details.

    Published:Apr 13, 2026
    Last Modified:Aug 5, 2026
    EPS:Apr 13, 2026
    EPSS Score:0.0029
    CVSS Score:7.3

    Affected Products

    Vendor
    Python
    Product
    Cpython

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-15310 (CVSS 2.1) — When decompressing crafted zip files using the bzip/LZMA/Zstandard compressions, Python could use an attacke…
    CVE-2026-19672 (CVSS 6.3) — The tarfile module's tar and data extraction filters created directories outside the destination for members…
    CVE-2026-15806 (CVSS 6) — The HTTPPasswordMgr class in the urllib.request module, along with its subclasses HTTPPasswordMgrWithDefaultRe…
    CVE-2026-17084 (CVSS 6) — The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unico…
    CVE-2026-18503 (CVSS 2.4) — Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and …
    CVE-2026-6879 (CVSS 2) — `Element.findall()` and fully-consumed `Element.iterfind()` exhibit `O(n^2)` time complexity when using XPath …
    CVE-2026-15308 (CVSS 8.7) — The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated untermi…
    CVE-2026-4360 (CVSS 2) — In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An a…
    CVE-2026-11972 (CVSS 8.2) — When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not …
    CVE-2026-0864 (CVSS 4.1) — When using the "configparser" module to write configuration files containing multi-line text values with carri…

    References

    https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53
    https://github.com/python/cpython/commit/a4d3edf3a6ecfde504d02126410d2a65a859b744
    https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bca
    https://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fff
    https://github.com/python/cpython/commit/d6d68494be70bdbda20f89f83801ba52ec37daa4
    https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769
    https://github.com/python/cpython/issues/148169
    https://github.com/python/cpython/pull/148170
    https://mail.python.org/archives/list/[email protected]/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/
    https://access.redhat.com/errata/RHSA-2026:10117
    https://access.redhat.com/errata/RHSA-2026:10140
    https://access.redhat.com/errata/RHSA-2026:10141
    https://access.redhat.com/errata/RHSA-2026:10711
    https://access.redhat.com/errata/RHSA-2026:10745
    https://access.redhat.com/errata/RHSA-2026:10774
    https://access.redhat.com/errata/RHSA-2026:10949
    https://access.redhat.com/errata/RHSA-2026:10950
    https://access.redhat.com/errata/RHSA-2026:11062
    https://access.redhat.com/errata/RHSA-2026:11077
    https://access.redhat.com/errata/RHSA-2026:11768
    https://access.redhat.com/errata/RHSA-2026:13692
    https://access.redhat.com/errata/RHSA-2026:13812
    https://access.redhat.com/errata/RHSA-2026:14652
    https://access.redhat.com/errata/RHSA-2026:14653
    https://access.redhat.com/errata/RHSA-2026:14656
    https://access.redhat.com/errata/RHSA-2026:16699
    https://access.redhat.com/errata/RHSA-2026:17525
    https://access.redhat.com/errata/RHSA-2026:17619
    https://access.redhat.com/errata/RHSA-2026:19019
    https://access.redhat.com/errata/RHSA-2026:19064
    https://access.redhat.com/errata/RHSA-2026:19175
    https://access.redhat.com/errata/RHSA-2026:19176
    https://access.redhat.com/errata/RHSA-2026:19177
    https://access.redhat.com/errata/RHSA-2026:19216
    https://access.redhat.com/errata/RHSA-2026:19549
    https://access.redhat.com/errata/RHSA-2026:19570
    https://access.redhat.com/errata/RHSA-2026:19571
    https://access.redhat.com/errata/RHSA-2026:19576
    https://access.redhat.com/errata/RHSA-2026:19589
    https://access.redhat.com/errata/RHSA-2026:19590
    https://access.redhat.com/errata/RHSA-2026:21275
    https://access.redhat.com/errata/RHSA-2026:21682
    https://access.redhat.com/errata/RHSA-2026:22144
    https://access.redhat.com/errata/RHSA-2026:25096
    https://access.redhat.com/errata/RHSA-2026:26187
    https://access.redhat.com/errata/RHSA-2026:28247
    https://access.redhat.com/errata/RHSA-2026:28581
    https://access.redhat.com/errata/RHSA-2026:30078
    https://access.redhat.com/errata/RHSA-2026:30087
    https://access.redhat.com/errata/RHSA-2026:30088
    https://access.redhat.com/errata/RHSA-2026:30089
    https://access.redhat.com/errata/RHSA-2026:35838
    https://access.redhat.com/errata/RHSA-2026:8822
    https://access.redhat.com/errata/RHSA-2026:8824
    https://access.redhat.com/errata/RHSA-2026:9228
    https://access.redhat.com/security/cve/CVE-2026-4786
    https://bugzilla.redhat.com/show_bug.cgi?id=2458049
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4786.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High