RHSA-2026:65762

Vulnerability from csaf_redhat - Published: 2026-09-09 03:04 - Updated: 2026-11-10 19:23
Summary
Red Hat Security Advisory: glib2 security update
Severity
Moderate
Notes
Topic: An update for glib2 is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: GLib provides the core application building blocks for libraries and applications written in C. It provides the core object system used in GNOME, the main loop implementation, and a large set of utility functions for strings and common data structures. Security Fix(es): * glib: buffer over-read in glib/gvariant-serialiser.c via gvs_tuple_is_normal() (CVE-2026-58010) * glib: out-of-bounds read in glib/gdatetime.c:g_date_time_get_ymd via invalid GDateTime (CVE-2026-58011) * glib: buffer over-read in g_regex_replace() via glib/gregex.c:string_append() and g_utf8_next_char() (CVE-2026-58012) * glib: buffer over-read in glib/giochannel.c via "g_io_channel_read_line_backend" (CVE-2026-58013) * glib: off-by-one error in glib/gkeyfile.c via "g_key_file_get_locale_string_list" (CVE-2026-58014) * glib: path traversal in glib/gio/gdbusauthmechanismsha1.c via keyring_lookup_entry and mechanism_client_data_receive (CVE-2026-58015) * GDBusServer: glib2: GDBusServer pre-authentication DoS via unbounded SASL line buffering (CVE-2026-15588) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-15588

A denial-of-service and resource exhaustion vulnerability exists within the `GDBus` component of GLib. The `gdbusauth` authentication mechanism fails to enforce proper length limitations on data lines read from a client. An unauthenticated local or remote attacker can exploit this lack of input validation by sending excessively long streams of data, causing the application to consume massive amounts of system memory and CPU, potentially leading to a crash or system hang.

5.3 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-0:2.56.4-10.el8_4.7.src —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-debuginfo-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-debuginfo-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-debugsource-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-debugsource-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-devel-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-devel-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-devel-debuginfo-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-devel-debuginfo-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-fam-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-fam-debuginfo-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-fam-debuginfo-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-tests-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-tests-debuginfo-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.AUS:glib2-tests-debuginfo-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-0:2.56.4-10.el8_4.7.src —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-debuginfo-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-debuginfo-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-debugsource-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-debugsource-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-devel-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-devel-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-devel-debuginfo-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-devel-debuginfo-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-fam-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-fam-debuginfo-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-fam-debuginfo-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-tests-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-tests-debuginfo-0:2.56.4-10.el8_4.7.i686 —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:glib2-tests-debuginfo-0:2.56.4-10.el8_4.7.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2026-58010

A flaw was found in GLib. An off-by-one error can occur in the gvs_tuple_is_normal function in the glib/gvariant-serialiser.c file when doing an alignment padding check because the bounds check uses > instead of >=, causing an out-of-bounds read of only 1 byte. This issue can cause a minor information disclosure of 1 byte and a denial of service when the out-of-bounds read crosses a page boundary.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CWE-126 - Buffer Over-read
Affected products
Fixed 34 products, the same list as for CVE-2026-15588
Threats
Impact Moderate
CVE-2026-58011

A flaw was found in GLib. An out-of-bounds read of only 2 bytes can occur in the g_date_time_get_ymd function in the glib/gdatetime.c file when an invalid GDateTime object produced by the g_date_time_add_full function is processed. This flaw can corrupt the date output and potentially cause logic errors that may lead to a denial of service.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CWE-125 - Out-of-bounds Read
Affected products
Fixed 34 products, the same list as for CVE-2026-15588
Threats
Impact Moderate
CVE-2026-58012

A flaw was found in GLib. A buffer over-read can occur in the g_regex_replace function when used with the `G_REGEX_RAW` compile flag and case-change replacement escapes because the string_append function processes matched substrings using UTF-8 functions that assume valid UTF-8 input, even when the string is treated as raw bytes. This vulnerability can cause a minor information disclosure of 1-5 bytes and a denial of service when the buffer over-read crosses a page boundary.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CWE-126 - Buffer Over-read
Affected products
Fixed 34 products, the same list as for CVE-2026-15588
Threats
Impact Moderate
CVE-2026-58013

A flaw was found in GLib. A buffer over-read can occur in g_io_channel_read_line_backend() in the giochannel.c file when a custom line terminator with a length greater than one is set, causing memcmp to read past the GString buffer. This vulnerability can cause a minor information disclosure of 7 bytes or a denial of service when the buffer over-read crosses a page boundary.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CWE-126 - Buffer Over-read
Affected products
Fixed 34 products, the same list as for CVE-2026-15588
Threats
Impact Moderate
CVE-2026-58014

A flaw was found in GLib. An off-by-one error can occur in the g_key_file_get_locale_string_list function in the gkeyfile.c file when loading a key file with an empty value. This flaw can cause an out-of-bounds access of 1 byte or a denial of service when the out-of-bounds access crosses a page boundary.

7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE-193 - Off-by-one Error
Affected products
Fixed 34 products, the same list as for CVE-2026-15588
Threats
Impact Moderate
CVE-2026-58015

A flaw was found in GLib. The D-Bus client-side implementation of the DBUS_COOKIE_SHA1 SASL authentication mechanism does not validate the cookie_context parameter received from the server. A malicious D-Bus server can supply a cookie_context containing path traversal sequences, causing the client to read an arbitrary file and exfiltrate sensitive data by verifying guessed file contents against a generated hash.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-22 - Improper Limitation of a Pathname to a Restricted Directory
Affected products
Fixed 34 products, the same list as for CVE-2026-15588
Threats
Impact Moderate
References
URL Category
https://access.redhat.com/errata/RHSA-2026:65762 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2492243 external
https://bugzilla.redhat.com/show_bug.cgi?id=2492245 external
https://bugzilla.redhat.com/show_bug.cgi?id=2492247 external
https://bugzilla.redhat.com/show_bug.cgi?id=2492248 external
https://bugzilla.redhat.com/show_bug.cgi?id=2492255 external
https://bugzilla.redhat.com/show_bug.cgi?id=2492256 external
https://bugzilla.redhat.com/show_bug.cgi?id=2499675 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-15588 self
https://bugzilla.redhat.com/show_bug.cgi?id=2499675 external
https://www.cve.org/CVERecord?id=CVE-2026-15588 external
https://nvd.nist.gov/vuln/detail/CVE-2026-15588 external
https://gitlab.gnome.org/GNOME/glib/-/issues/3985 external
https://access.redhat.com/security/cve/CVE-2026-58010 self
https://bugzilla.redhat.com/show_bug.cgi?id=2492243 external
https://www.cve.org/CVERecord?id=CVE-2026-58010 external
https://nvd.nist.gov/vuln/detail/CVE-2026-58010 external
https://gitlab.gnome.org/GNOME/glib/-/issues/3915 external
https://access.redhat.com/security/cve/CVE-2026-58011 self
https://bugzilla.redhat.com/show_bug.cgi?id=2492245 external
https://www.cve.org/CVERecord?id=CVE-2026-58011 external
https://nvd.nist.gov/vuln/detail/CVE-2026-58011 external
https://gitlab.gnome.org/GNOME/glib/-/issues/3917 external
https://access.redhat.com/security/cve/CVE-2026-58012 self
https://bugzilla.redhat.com/show_bug.cgi?id=2492247 external
https://www.cve.org/CVERecord?id=CVE-2026-58012 external
https://nvd.nist.gov/vuln/detail/CVE-2026-58012 external
https://gitlab.gnome.org/GNOME/glib/-/issues/3918 external
https://access.redhat.com/security/cve/CVE-2026-58013 self
https://bugzilla.redhat.com/show_bug.cgi?id=2492248 external
https://www.cve.org/CVERecord?id=CVE-2026-58013 external
https://nvd.nist.gov/vuln/detail/CVE-2026-58013 external
https://gitlab.gnome.org/GNOME/glib/-/issues/3925 external
https://access.redhat.com/security/cve/CVE-2026-58014 self
https://bugzilla.redhat.com/show_bug.cgi?id=2492255 external
https://www.cve.org/CVERecord?id=CVE-2026-58014 external
https://nvd.nist.gov/vuln/detail/CVE-2026-58014 external
https://gitlab.gnome.org/GNOME/glib/-/issues/3930 external
https://access.redhat.com/security/cve/CVE-2026-58015 self
https://bugzilla.redhat.com/show_bug.cgi?id=2492256 external
https://www.cve.org/CVERecord?id=CVE-2026-58015 external
https://nvd.nist.gov/vuln/detail/CVE-2026-58015 external
https://gitlab.gnome.org/GNOME/glib/-/issues/3931 external
Acknowledgments
Gitee Codepecker Lab
linhlhq
Thepwnisher
To clipboard 

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          "text": "A flaw was found in the `GDBus` component of GLib. A local or remote unauthenticated attacker could send an engineered stream of data without line length limitations during the authentication process (`gdbusauth`), leading to excessive memory allocation and CPU consumption. This resource exhaustion can result in a denial-of-service (DoS) condition, causing applications or services dependent on GLib to become unstable or crash.",
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          "title": "Vulnerability description"
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          "category": "summary",
          "text": "glib: buffer over-read in glib/gvariant-serialiser.c via gvs_tuple_is_normal()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Any applications calling the `g_variant_is_normal_form()`,\u00a0`g_variant_get_normal_form()` or\u00a0`g_variant_byteswap()` functions that process untrusted GVariant data received from D-Bus, network or file are vulnerable to this issue. This flaw can cause an out-of-bounds read of only 1 byte, leading to an information disclosure of only 1 byte and a denial of service when the out-of-bounds read crosses a page boundary. Due to these reasons, this vulnerability has been rated with a moderate severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "glib: out-of-bounds read in glib/gdatetime.c:g_date_time_get_ymd via invalid GDateTime",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Any applications that allow a user to submit a date to `g_date_time_add_full()` and later call any getter functions, such as `g_date_time_get_month()` or `g_date_time_get_year()`, with the returned GDateTime object are vulnerable to this issue. This flaw can cause an out-of-bounds read of only 2 bytes, leading to a denial of service due to logic errors that a corrupted date can trigger. Due to these reasons, this vulnerability has been rated with a moderate severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "text": "A flaw was found in GLib. A buffer over-read can occur in the g_regex_replace function when used with the `G_REGEX_RAW` compile flag and case-change replacement escapes because the string_append function processes matched substrings using UTF-8 functions that assume valid UTF-8 input, even when the string is treated as raw bytes. This vulnerability can cause a minor information disclosure of 1-5 bytes and a denial of service when the buffer over-read crosses a page boundary.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "glib: buffer over-read in g_regex_replace() via glib/gregex.c:string_append() and g_utf8_next_char()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Any applications that use g_regex_replace() or g_regex_replace_eval() with the G_REGEX_RAW compile flag and allow user-controlled replacement strings containing case-change escapes (\\u,\u00a0\\l,\u00a0\\U,\u00a0\\L) are vulnerable to this issue. This flaw can cause a buffer over-read of 1-5 bytes, leading to a minor information disclosure and a denial of service when the buffer over-read crosses a page boundary. Due to these reasons, this vulnerability has been rated with a moderate severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "glib: buffer over-read in glib/giochannel.c via \"g_io_channel_read_line_backend\"",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Any applications calling g_io_channel_set_line_term() with a multi-byte line terminator (length greater than one) and subsequently calling g_io_channel_read_line_backend() are vulnerable to this issue. This flaw can cause a buffer over-read of 8 bytes, leading to an information disclosure of 7 bytes or a denial of service when the buffer over-read crosses a page boundary. Due to these reasons, this vulnerability has been rated with a moderate severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "glib: off-by-one error in glib/gkeyfile.c via \"g_key_file_get_locale_string_list\"",
          "title": "Vulnerability summary"
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          "text": "Any applications loading or parsing untrusted key files, typically .desktop or .ini files, are vulnerable to this issue. This flaw can cause an off-by-one error, leading to an out-of-bounds access of 1 byte or a denial of service when the out-of-bounds access crosses a page boundary. Due to these reasons, this vulnerability has been rated with a moderate severity.",
          "title": "Statement"
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          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "glib: path traversal in glib/gio/gdbusauthmechanismsha1.c via keyring_lookup_entry and mechanism_client_data_receive",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "To exploit this flaw, an attacker must be in a position to perform a man-in-the-middle (MitM) attack on the connection or operate a malicious server that the client connects to. Furthermore, extracting data requires an oracle attack (guessing and hashing), increasing the complexity of exploitation. However, if successful, this issue allows the exfiltration of sensitive secrets, such as SSH keys or API tokens, from the filesystem. Due to these reasons, this vulnerability has been rated with a moderate severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "glib: path traversal in glib/gio/gdbusauthmechanismsha1.c via keyring_lookup_entry and mechanism_client_data_receive"
    }
  ]
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.