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openSUSE Leap · Security advisory · September 24, 2026
openSUSE Leap · Security advisory · September 24, 2026OPENSUSE-SU-2026:21945-1: expat security update
OPENSUSE-SU-2026:21945-1, released September 24, 2026, fixes 17 CVEs in expat (version 2.8.4-160000.1.1). None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
17
None rated Critical
Exploited
0
None reported
Highest CVSS
8.2
Base score, 0 to 10
Highest EPSS
0.0074
54th percentile
Priority of the 17 CVEs
Patch now 0
Urgent 0
High 4
Routine 13
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| expat | opensuse-leap 16.0 | 2.8.4-160000.1.1 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2026-66046 | Expat Denial of Service via storeAtts() Quadratic Complexity | 7.5 | 0.0074 | None reported |
| High | CVE-2026-45186 | In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input. | 8.2 | 0.0048 | None reported |
| High | CVE-2026-76956 | In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content. | 7.5 | 0.0029 | None reported |
| High | CVE-2026-76957 | libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412. | 7.8 | 0.0011 | None reported |
| Routine | CVE-2026-41080 | expat: libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document. | 2.9 | 0.0040 | None reported |
| Routine | CVE-2026-76641 | expat: Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption b... | n/a | 0.0035 | None reported |
| Routine | CVE-2026-72522 | libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions. | 6.2 | 0.0019 | None reported |
| Routine | CVE-2026-50219 | libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur, | 6.9 | 0.0018 | None reported |
| Routine | CVE-2026-56412 | libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219. | 5.9 | 0.0018 | None reported |
| Routine | CVE-2026-56131 | libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation). | 4.9 | 0.0018 | None reported |
| Routine | CVE-2026-56406 | libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse. | 6.9 | 0.0017 | None reported |
| Routine | CVE-2026-56407 | libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen. | 6.9 | 0.0017 | None reported |
| Routine | CVE-2026-56132 | In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers. | 6.9 | 0.0014 | None reported |
| Routine | CVE-2026-56410 | xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId. | 6.9 | 0.0013 | None reported |
| Routine | CVE-2026-56411 | xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations. | 6.9 | 0.0013 | None reported |
| Routine | CVE-2026-56408 | expat: libexpat before 2.8.2 has an integer overflow in copyString. | 6.9 | 0.0013 | None reported |
| Routine | CVE-2026-56409 | xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used. | 6.5 | 0.0012 | None reported |
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