CVE-2026-74860
High
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.
SeverityHigh
CVSS8.5
Exploit probability—
Product
Red Hat Enterprise Linux 10
PublishedSep 8, 2026
First seenSep 8, 2026
Weakness typeCWE-763CWE-763
How to fix
Vendor advisories
- access.redhat.com/errata/RHSA-2026:64463
- access.redhat.com/errata/RHSA-2026:71585
- access.redhat.com/errata/RHSA-2026:71586
- access.redhat.com/errata/RHSA-2026:71641
- access.redhat.com/errata/RHSA-2026:72470
- access.redhat.com/errata/RHSA-2026:72475
- access.redhat.com/errata/RHSA-2026:72476
- access.redhat.com/errata/RHSA-2026:79357
- access.redhat.com/errata/RHSA-2026:82939
- access.redhat.com/errata/RHSA-2026:89750
- access.redhat.com/errata/RHSA-2026:89759
- access.redhat.com/errata/RHSA-2026:90309
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Red Hat Enterprise Linux 10 | No range specified | — |
| Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support | No range specified | — |
| Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support | No range specified | — |
| enterprise_linux 8 | No range specified | — |
| rhel_aus 8.4 | No range specified | — |
| rhel_aus 8.6 | No range specified | — |
| rhel_e4s 8.8 | No range specified | — |
| enterprise_linux 9 | No range specified | — |
| rhel_e4s 9.2 | No range specified | — |
| rhel_e4s 9.4 | No range specified | — |
| rhel_eus 9.6 | No range specified | — |
| cert_manager 1.20 | No range specified | — |
| cost_management_on_premise 1 | No range specified | — |
| Red Hat Red Hat Hardened Images | No range specified | — |
| openshift_ai 3.0 | No range specified | — |
| openshift_ai 3.4 | No range specified | — |
| openshift_ai 3.5 | No range specified | — |
| rhui 5 | No range specified | — |
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