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26 vulnerabilities found for by libexpat project
CVE-2026-76957 (GCVE-0-2026-76957)
Vulnerability from cvelistv5
Published
2026-08-20 04:28
Modified
2026-08-20 15:26
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - Use After Free
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-76956 (GCVE-0-2026-76956)
Vulnerability from cvelistv5
Published
2026-08-20 04:22
Modified
2026-08-20 17:42
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-394 - Unexpected Status Code or Return Value
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 2.8.2 ≤ |
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CVE-2026-66046 (GCVE-0-2026-66046)
Vulnerability from cvelistv5
Published
2026-08-18 14:10
Modified
2026-08-21 11:20
Severity ?
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
VLAI Severity ?
EPSS score ?
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Summary
Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring authentication, external entity resolution, or non-default parser options.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
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Impacted products
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CVE-2026-72522 (GCVE-0-2026-72522)
Vulnerability from cvelistv5
Published
2026-08-10 03:28
Modified
2026-08-13 14:08
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-125 - Out-of-bounds Read
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56412 (GCVE-0-2026-56412)
Vulnerability from cvelistv5
Published
2026-06-21 15:58
Modified
2026-06-22 16:31
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - Use After Free
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56411 (GCVE-0-2026-56411)
Vulnerability from cvelistv5
Published
2026-06-21 15:56
Modified
2026-06-22 16:31
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56410 (GCVE-0-2026-56410)
Vulnerability from cvelistv5
Published
2026-06-21 15:55
Modified
2026-06-22 15:56
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56409 (GCVE-0-2026-56409)
Vulnerability from cvelistv5
Published
2026-06-21 15:52
Modified
2026-06-22 15:56
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56408 (GCVE-0-2026-56408)
Vulnerability from cvelistv5
Published
2026-06-21 15:51
Modified
2026-06-22 15:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
libexpat before 2.8.2 has an integer overflow in copyString.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56407 (GCVE-0-2026-56407)
Vulnerability from cvelistv5
Published
2026-06-21 15:49
Modified
2026-06-22 15:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56406 (GCVE-0-2026-56406)
Vulnerability from cvelistv5
Published
2026-06-21 15:48
Modified
2026-06-22 17:02
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56405 (GCVE-0-2026-56405)
Vulnerability from cvelistv5
Published
2026-06-21 15:47
Modified
2026-06-22 17:03
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
libexpat before 2.8.2 has an integer overflow in getAttributeId.
References
Impacted products
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| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56404 (GCVE-0-2026-56404)
Vulnerability from cvelistv5
Published
2026-06-21 15:45
Modified
2026-06-22 17:05
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
libexpat before 2.8.2 has an integer overflow in addBinding.
References
Impacted products
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| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56403 (GCVE-0-2026-56403)
Vulnerability from cvelistv5
Published
2026-06-21 15:43
Modified
2026-06-22 17:05
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
libexpat before 2.8.2 has an integer overflow in storeAtts.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56132 (GCVE-0-2026-56132)
Vulnerability from cvelistv5
Published
2026-06-19 03:00
Modified
2026-06-22 14:59
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-821 - Incorrect Synchronization
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-56131 (GCVE-0-2026-56131)
Vulnerability from cvelistv5
Published
2026-06-19 02:56
Modified
2026-06-22 14:58
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - Use After Free
Summary
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).
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-50219 (GCVE-0-2026-50219)
Vulnerability from cvelistv5
Published
2026-06-04 04:20
Modified
2026-06-04 12:36
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - Use After Free
Summary
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,
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-45186 (GCVE-0-2026-45186)
Vulnerability from cvelistv5
Published
2026-05-10 06:36
Modified
2026-08-25 12:05
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Summary
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.
References
Impacted products
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Version: 0 ≤ |
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CVE-2026-41080 (GCVE-0-2026-41080)
Vulnerability from cvelistv5
Published
2026-04-16 16:52
Modified
2026-07-14 12:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-331 - Insufficient Entropy
Summary
libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.
References
Impacted products
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CVE-2026-32778 (GCVE-0-2026-32778)
Vulnerability from cvelistv5
Published
2026-03-16 07:02
Modified
2026-07-14 12:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-476 - NULL Pointer Dereference
Summary
libexpat before 2.7.5 allows a NULL pointer dereference in the function setContext on retry after an earlier ouf-of-memory condition.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-32777 (GCVE-0-2026-32777)
Vulnerability from cvelistv5
Published
2026-03-16 06:58
Modified
2026-07-14 12:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Summary
libexpat before 2.7.5 allows an infinite loop while parsing DTD content.
References
Impacted products
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| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2026-32776 (GCVE-0-2026-32776)
Vulnerability from cvelistv5
Published
2026-03-16 06:54
Modified
2026-07-14 12:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-476 - NULL Pointer Dereference
Summary
libexpat before 2.7.5 allows a NULL pointer dereference with empty external parameter entity content.
References
Impacted products
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| libexpat project | libexpat |
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CVE-2026-25210 (GCVE-0-2026-25210)
Vulnerability from cvelistv5
Published
2026-01-30 06:40
Modified
2026-06-02 13:01
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
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CVE-2026-24515 (GCVE-0-2026-24515)
Vulnerability from cvelistv5
Published
2026-01-23 07:46
Modified
2026-06-02 13:01
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-476 - NULL Pointer Dereference
Summary
In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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CVE-2025-66382 (GCVE-0-2025-66382)
Vulnerability from cvelistv5
Published
2025-11-28 00:00
Modified
2026-07-14 12:43
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Summary
In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ 2.7.5 |
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CVE-2025-59375 (GCVE-0-2025-59375)
Vulnerability from cvelistv5
Published
2025-09-15 00:00
Modified
2026-07-14 12:43
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| libexpat project | libexpat |
Version: 0 ≤ |
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