CVE-2026-74860
Libxml2: double-free/uaf in libxml2 python bindings
Description
A flaw was found in libxml2 with Python bindings enabled. A remote attacker could exploit this vulnerability by providing a specially crafted XML document containing a Document Type Definition (DTD) with enumerated attribute values. This triggers a double-free error in the SAX attributeDecl callback handler, where a string is freed twice. This flaw can lead to a denial of service (DoS) due to a reproducible crash in Python applications using the libxml2 SAX bindings.
INFO
Published Date :
Sept. 8, 2026, 12:16 p.m.
Last Modified :
Oct. 30, 2026, 1:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-74860
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update libxml2 to the patched version.
- Recompile Python bindings if necessary.
- Test application stability after updates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74860.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74860 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74860
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74860 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74860 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
Oct. 30, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:92589 -
CVE Modified by [email protected]
Oct. 29, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:91202 Added Reference https://access.redhat.com/errata/RHSA-2026:91204 Added Reference https://access.redhat.com/errata/RHSA-2026:91206 Added Reference https://access.redhat.com/errata/RHSA-2026:91207 Added Reference https://access.redhat.com/errata/RHSA-2026:91217 Added Reference https://access.redhat.com/errata/RHSA-2026:91218 Added Reference https://access.redhat.com/errata/RHSA-2026:91219 Added Reference https://access.redhat.com/errata/RHSA-2026:91224 Added Reference https://access.redhat.com/errata/RHSA-2026:91232 Added Reference https://access.redhat.com/errata/RHSA-2026:91233 Added Reference https://access.redhat.com/errata/RHSA-2026:91234 Added Reference https://access.redhat.com/errata/RHSA-2026:91235 Added Reference https://access.redhat.com/errata/RHSA-2026:91236 Added Reference https://access.redhat.com/errata/RHSA-2026:91237 Added Reference https://access.redhat.com/errata/RHSA-2026:91238 Added Reference https://access.redhat.com/errata/RHSA-2026:91241 Added Reference https://access.redhat.com/errata/RHSA-2026:91242 Added Reference https://access.redhat.com/errata/RHSA-2026:91243 Added Reference https://access.redhat.com/errata/RHSA-2026:91244 Added Reference https://access.redhat.com/errata/RHSA-2026:91245 Added Reference https://access.redhat.com/errata/RHSA-2026:91246 Added Reference https://access.redhat.com/errata/RHSA-2026:91248 Added Reference https://access.redhat.com/errata/RHSA-2026:91249 -
CVE Modified by [email protected]
Oct. 29, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:92352 -
CVE Modified by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:90309 -
CVE Modified by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:89750 Added Reference https://access.redhat.com/errata/RHSA-2026:89759 -
CVE Modified by [email protected]
Oct. 14, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:82939 -
CVE Modified by [email protected]
Oct. 09, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:79357 -
CVE Modified by [email protected]
Oct. 06, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> -
CVE Modified by [email protected]
Sep. 28, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:72470 Added Reference https://access.redhat.com/errata/RHSA-2026:72475 Added Reference https://access.redhat.com/errata/RHSA-2026:72476 -
CVE Modified by [email protected]
Sep. 24, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:71585 -
CVE Modified by [email protected]
Sep. 24, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:71641 -
CVE Modified by [email protected]
Sep. 24, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:71586 -
CVE Modified by [email protected]
Sep. 10, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> -
CVE Modified by [email protected]
Sep. 09, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/errata/RHSA-2026:64463 -
CVE Modified by [email protected]
Sep. 09, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 08, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-74860', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-08T12:08:31.722346Z'} -
New CVE Received by [email protected]
Sep. 08, 2026
Action Type Old Value New Value Added Description A flaw was found in libxml2 with Python bindings enabled. A remote attacker could exploit this vulnerability by providing a specially crafted XML document containing a Document Type Definition (DTD) with enumerated attribute values. This triggers a double-free error in the SAX attributeDecl callback handler, where a string is freed twice. This flaw can lead to a denial of service (DoS) due to a reproducible crash in Python applications using the libxml2 SAX bindings. Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-763 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74860.json">CVE-2026-74860</a> Added Reference https://access.redhat.com/security/cve/CVE-2026-74860 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2529697