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10 vulnerabilities by libexpat
CVE-2026-102633 (GCVE-0-2026-102633)
Vulnerability from nvd – Published: 2026-09-29 16:04 – Updated: 2026-09-29 16:52
VLAI
EPSS
VEX
Title
libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_realloc
Summary
libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 16:52 UTC
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/1392 | issue-trackingpatch |
| https://github.com/libexpat/libexpat/commit/20980… | patch |
| https://github.com/libexpat/libexpat/blob/R_2_8_5… | technical-description |
| https://github.com/libexpat/libexpat | product |
| https://www.vulncheck.com/advisories/libexpat-2.7… | third-party-advisory |
Impacted products
Date Public
2026-09-25 00:00
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CVE-2026-93990 (GCVE-0-2026-93990)
Vulnerability from nvd – Published: 2026-09-19 22:58 – Updated: 2026-09-28 16:11
VLAI
EPSS
VEX
Title
Expat before 2.8.5 Malformed UTF-16 Acceptance via Unchecked Surrogate
Summary
Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 15:10 UTC
CWE
- CWE-176 - Improper Handling of Unicode Encoding
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/1282 | issue-trackingpatch |
| https://github.com/libexpat/libexpat/commit/ff6e1… | patch |
| https://github.com/libexpat/libexpat/releases/tag… | release-notes |
| https://blog.hartwork.org/posts/expat-2-8-5-released/ | vendor-advisory |
| https://github.com/libexpat/libexpat | product |
| https://www.vulncheck.com/advisories/expat-throug… | third-party-advisory |
Impacted products
Date Public
2026-09-18 00:00
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CVE-2026-76641 (GCVE-0-2026-76641)
Vulnerability from nvd – Published: 2026-08-20 17:31 – Updated: 2026-10-01 15:21 X_Open Source
VLAI
EPSS
VEX
Title
Expat Out-of-Bounds Read via dtdCopy
Summary
Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption by processing XML with external entity parsers created via XML_ExternalEntityParserCreate. A struct size mismatch between ELEMENT_TYPE members causes storeAtts to read the attIndex member past allocated memory boundaries, resulting in failure to normalize whitespace in non-CDATA attributes or a wild pointer dereference causing a segfault. This vulnerability was introduced by the fix for CVE-2026-66046.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 18:48 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/1331 | issue-tracking |
| https://github.com/libexpat/libexpat/commit/98599… | patch |
| https://www.vulncheck.com/advisories/expat-out-of… | third-party-advisory |
Impacted products
Date Public
2026-08-19 00:00
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CVE-2024-45492 (GCVE-0-2024-45492)
Vulnerability from nvd – Published: 2024-08-30 00:00 – Updated: 2026-07-14 12:38
VLAI
EPSS
VEX
Summary
An issue was discovered in libexpat before 2.6.3. nextScaffoldPart in xmlparse.c can have an integer overflow for m_groupSize on 32-bit platforms (where UINT_MAX equals SIZE_MAX).
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-30 13:53 UTC
CWE
- n/a
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
6 references
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat | expat |
Affected:
0 , < 2.6.3
(custom)
cpe:2.3:a:libexpat:expat:*:*:*:*:*:*:*:* |
|
| Siemens | RUGGEDCOM RST2428P |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family |
Unaffected:
0 , < *
(custom)
|
|
| Siemens | SCALANCE XCM-/XRM-/XCH-/XRH-300 family |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
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CVE-2024-45491 (GCVE-0-2024-45491)
Vulnerability from nvd – Published: 2024-08-30 00:00 – Updated: 2026-07-14 12:38
VLAI
EPSS
VEX
Summary
An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT_MAX equals SIZE_MAX).
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-30 13:53 UTC
CWE
- n/a
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
6 references
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat | expat |
Affected:
0 , < 2.6.3
(custom)
cpe:2.3:a:libexpat:expat:*:*:*:*:*:*:*:* |
|
| Siemens | RUGGEDCOM RST2428P |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family |
Unaffected:
0 , < *
(custom)
|
|
| Siemens | SCALANCE XCM-/XRM-/XCH-/XRH-300 family |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
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CVE-2026-102633 (GCVE-0-2026-102633)
Vulnerability from cvelistv5 – Published: 2026-09-29 16:04 – Updated: 2026-09-29 16:52
VLAI
EPSS
VEX
Title
libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_realloc
Summary
libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 16:52 UTC
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/1392 | issue-trackingpatch |
| https://github.com/libexpat/libexpat/commit/20980… | patch |
| https://github.com/libexpat/libexpat/blob/R_2_8_5… | technical-description |
| https://github.com/libexpat/libexpat | product |
| https://www.vulncheck.com/advisories/libexpat-2.7… | third-party-advisory |
Impacted products
Date Public
2026-09-25 00:00
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CVE-2026-93990 (GCVE-0-2026-93990)
Vulnerability from cvelistv5 – Published: 2026-09-19 22:58 – Updated: 2026-09-28 16:11
VLAI
EPSS
VEX
Title
Expat before 2.8.5 Malformed UTF-16 Acceptance via Unchecked Surrogate
Summary
Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 15:10 UTC
CWE
- CWE-176 - Improper Handling of Unicode Encoding
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/1282 | issue-trackingpatch |
| https://github.com/libexpat/libexpat/commit/ff6e1… | patch |
| https://github.com/libexpat/libexpat/releases/tag… | release-notes |
| https://blog.hartwork.org/posts/expat-2-8-5-released/ | vendor-advisory |
| https://github.com/libexpat/libexpat | product |
| https://www.vulncheck.com/advisories/expat-throug… | third-party-advisory |
Impacted products
Date Public
2026-09-18 00:00
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CVE-2026-76641 (GCVE-0-2026-76641)
Vulnerability from cvelistv5 – Published: 2026-08-20 17:31 – Updated: 2026-10-01 15:21 X_Open Source
VLAI
EPSS
VEX
Title
Expat Out-of-Bounds Read via dtdCopy
Summary
Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption by processing XML with external entity parsers created via XML_ExternalEntityParserCreate. A struct size mismatch between ELEMENT_TYPE members causes storeAtts to read the attIndex member past allocated memory boundaries, resulting in failure to normalize whitespace in non-CDATA attributes or a wild pointer dereference causing a segfault. This vulnerability was introduced by the fix for CVE-2026-66046.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 18:48 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/1331 | issue-tracking |
| https://github.com/libexpat/libexpat/commit/98599… | patch |
| https://www.vulncheck.com/advisories/expat-out-of… | third-party-advisory |
Impacted products
Date Public
2026-08-19 00:00
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CVE-2024-45491 (GCVE-0-2024-45491)
Vulnerability from cvelistv5 – Published: 2024-08-30 00:00 – Updated: 2026-07-14 12:38
VLAI
EPSS
VEX
Summary
An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT_MAX equals SIZE_MAX).
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-30 13:53 UTC
CWE
- n/a
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
6 references
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat | expat |
Affected:
0 , < 2.6.3
(custom)
cpe:2.3:a:libexpat:expat:*:*:*:*:*:*:*:* |
|
| Siemens | RUGGEDCOM RST2428P |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family |
Unaffected:
0 , < *
(custom)
|
|
| Siemens | SCALANCE XCM-/XRM-/XCH-/XRH-300 family |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
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CVE-2024-45492 (GCVE-0-2024-45492)
Vulnerability from cvelistv5 – Published: 2024-08-30 00:00 – Updated: 2026-07-14 12:38
VLAI
EPSS
VEX
Summary
An issue was discovered in libexpat before 2.6.3. nextScaffoldPart in xmlparse.c can have an integer overflow for m_groupSize on 32-bit platforms (where UINT_MAX equals SIZE_MAX).
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-30 13:53 UTC
CWE
- n/a
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
6 references
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat | expat |
Affected:
0 , < 2.6.3
(custom)
cpe:2.3:a:libexpat:expat:*:*:*:*:*:*:*:* |
|
| Siemens | RUGGEDCOM RST2428P |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family |
Unaffected:
0 , < *
(custom)
|
|
| Siemens | SCALANCE XCM-/XRM-/XCH-/XRH-300 family |
Affected:
0 , < V3.1
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
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