Linux · 
Amazon Linux · Security advisory · September 14, 2026
Amazon Linux · Security advisory · September 14, 2026ALAS2023-2026-2157: Security update for 5 packages
ALAS2023-2026-2157, released September 14, 2026, fixes 11 CVEs across 5 products. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
11
None rated Critical
Exploited
0
None reported
Highest CVSS
7.8
Base score, 0 to 10
Highest EPSS
0.0074
54th percentile
Priority of the 11 CVEs
Patch now 0
Urgent 0
High 2
Routine 9
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| expat | amzn 2023 | 2.8.3-1.amzn2023.0.1 |
| expat-debuginfo | amzn 2023 | 2.8.3-1.amzn2023.0.1 |
| expat-debugsource | amzn 2023 | 2.8.3-1.amzn2023.0.1 |
| expat-devel | amzn 2023 | 2.8.3-1.amzn2023.0.1 |
| expat-static | amzn 2023 | 2.8.3-1.amzn2023.0.1 |
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-2026-76957 | 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-2026-50219 | 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-2026-56404 | libexpat before 2.8.2 has an integer overflow in addBinding. | 6.9 | 0.0013 | 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-2026-56405 | libexpat before 2.8.2 has an integer overflow in getAttributeId. | 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 |
Showing 1 to 11 of 11
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