# RHSA-2026:89759: libxml2 security update

RHSA-2026:89759, released August 28, 2026, fixes 7 CVEs in libxml2 (version 2.12.5-9.el10_0.9). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-89759
- Platform: Linux
- Released: Aug 28, 2026
- Priority: High (Closes CVE-2026-74860, high severity)
- CVEs: 7, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:89759

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libxml2](https://patchblox.com/security/data/product/linux/libxml2.md) | RHEL 10 | 2.12.5-9.el10_0.9 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-74860](https://patchblox.com/security/data/cve/CVE-2026-74860.md) | High | libxml2: A flaw was found in libxml2 with Python bindings enabled | 8.5 | 0.0066 |  |
| [CVE-2026-86143](https://patchblox.com/security/data/cve/CVE-2026-86143.md) | High | In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback. | 8.5 | 0.0019 |  |
| [CVE-2026-86144](https://patchblox.com/security/data/cve/CVE-2026-86144.md) | High | In xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and xmlXIncludeProcessTree do not propagate parseFlags. This has security relevance for, for example, the XML_PARSE_NONET flag, if (without it) a custom resource loader accesses the internet and triggers XML external entity injection, SSRF, or a denial of service (e.g., for an attacker-controlled internet resource that is intentionally slow). | 8.5 | 0.0019 |  |
| [CVE-2026-86140](https://patchblox.com/security/data/cve/CVE-2026-86140.md) | High | In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow. | 8.5 | 0.0016 |  |
| [CVE-2026-86142](https://patchblox.com/security/data/cve/CVE-2026-86142.md) | High | In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer length saturation. | 8.5 | 0.0016 |  |
| [CVE-2026-11979](https://patchblox.com/security/data/cve/CVE-2026-11979.md) | High | Stack-Based Buffer Overflow in libxml2 | 7.8 | 0.0015 |  |
| [CVE-2026-86138](https://patchblox.com/security/data/cve/CVE-2026-86138.md) | High | In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow. | 8.5 | 0.0013 |  |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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