Common Weakness Enumeration
CWE-787
Allowed-with-ReviewOut-of-bounds Write
Abstraction: Base · Status: Draft
The product writes data past the end, or before the beginning, of the intended buffer.
15096 vulnerabilities reference this CWE, most recent first.
CVE-2026-6681 (GCVE-0-2026-6681)
Vulnerability from cvelistv5 – Published: 2026-06-25 20:11 – Updated: 2026-06-26 13:14
VLAI
EPSS
VEX
Title
PKCS#7 decode ignores caller output buffer size, writing past buffer bounds
Summary
The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
2 references
Impacted products
Credits
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CVE-2026-6679 (GCVE-0-2026-6679)
Vulnerability from cvelistv5 – Published: 2026-06-25 20:13 – Updated: 2026-06-26 13:13
VLAI
EPSS
VEX
Title
DTLS 1.3 ACK serialization heap buffer overflow via integer truncation
Summary
A heap buffer overflow could occur in the DTLS 1.3 ACK serialization path before the connecting peer is authenticated. The buffer overflow was due to an integer truncation when computing the length of the ACK record-number list, causing an undersized buffer to be allocated and then overrun. This affects builds using DTLS 1.3 and wolfSSL version 5.9.0 and earlier. A fix was added to the 5.9.1 release.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
Impacted products
Credits
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CVE-2026-6676 (GCVE-0-2026-6676)
Vulnerability from cvelistv5 – Published: 2026-06-12 22:16 – Updated: 2026-06-15 18:01
VLAI
EPSS
VEX
Title
Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive
Summary
Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed POSIX tar archive may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.
This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Gen Digital | Avira Antivirus |
Affected:
0 , < 8.3.27.12
(custom)
|
Date Public
2026-02-26 11:42
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CVE-2026-6507 (GCVE-0-2026-6507)
Vulnerability from cvelistv5 – Published: 2026-04-17 12:23 – Updated: 2026-04-20 14:59
VLAI
EPSS
VEX
Title
Dnsmasq: dnsmasq: denial of service due to out-of-bounds write in dhcp bootreply processing
Summary
A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS).
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
2 references
| URL | Tags |
|---|---|
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| https://bugzilla.redhat.com/show_bug.cgi?id=2459181 | issue-trackingx_refsource_REDHAT |
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4 |
Date Public
2026-04-17 11:37
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CVE-2026-6325 (GCVE-0-2026-6325)
Vulnerability from cvelistv5 – Published: 2026-06-25 21:04 – Updated: 2026-06-26 10:23
VLAI
EPSS
VEX
Title
Out-of-bounds write in SetSuitesHashSigAlgo on oversized signature algorithms list
Summary
Out-of-bounds write in SetSuitesHashSigAlgo when processing an oversized signature algorithms list, allowing a write past the bounds of the destination buffer.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
2 references
Impacted products
Credits
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CVE-2026-6100 (GCVE-0-2026-6100)
Vulnerability from cvelistv5 – Published: 2026-04-13 17:15 – Updated: 2026-07-15 00:41
VLAI
EPSS
VEX
Title
Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after re-use under memory pressure
Summary
Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-used. This scenario can be triggered if the process is under memory pressure. The fix cleans up the dangling pointer in this specific error condition.
The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
53 references
Impacted products
63 products
| Vendor | Product | Version | |
|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.14
(python)
Affected: 3.14.0a1 , < 3.14.5rc1 (python) Affected: 3.15.0a1 , < 3.15.0b1 (python) |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:3.12.12-3.el10_1.3 , < *
(rpm)
Unaffected: 0:3.12.13-2.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.1 cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:3.14.4-2.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:3.12.9-2.el10_0.9 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:3.12.13-2.el8_10 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:3.11.13-7.el8_10 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:3.6.8-76.el8_10 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
0:3.6.8-39.el8_4.11 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4 |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
Unaffected:
0:3.6.8-39.el8_4.11 , < *
(rpm)
cpe:/a:redhat:rhel_eus_long_life:8.4 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
Unaffected:
0:3.6.8-47.el8_6.13 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service |
Unaffected:
0:3.6.8-47.el8_6.13 , < *
(rpm)
cpe:/a:redhat:rhel_tus:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions |
Unaffected:
0:3.6.8-47.el8_6.13 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
Unaffected:
0:3.6.8-51.el8_8.15 , < *
(rpm)
cpe:/a:redhat:rhel_tus:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
Unaffected:
0:3.11.2-2.el8_8.10 , < *
(rpm)
cpe:/a:redhat:rhel_tus:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
Unaffected:
0:3.6.8-51.el8_8.15 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
Unaffected:
0:3.11.2-2.el8_8.10 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:3.12.12-4.el9_7.3 , < *
(rpm)
Unaffected: 0:3.12.13-2.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:3.11.13-5.3.el9_7 , < *
(rpm)
Unaffected: 0:3.11.13-9.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:3.9.25-3.el9_7.3 , < *
(rpm)
Unaffected: 0:3.9.25-7.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:3.14.4-2.el9_8 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions |
Unaffected:
0:3.9.10-4.el9_0.11 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.0 |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:3.11.2-2.el9_2.12 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2 |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:3.9.16-1.el9_2.14 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support |
Unaffected:
0:3.11.7-1.el9_4.13 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support |
Unaffected:
0:3.12.1-4.el9_4.13 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support |
Unaffected:
0:3.9.18-3.el9_4.13 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:3.11.11-2.el9_6.7 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:3.12.9-1.el9_6.8 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:3.9.21-2.el9_6.6 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
|
| Red Hat | RHEL-8 based Middleware Containers |
Unaffected:
7.13.5-4.1777325677 , < *
(rpm)
cpe:/a:redhat:rhosemc:1.0::el8 |
|
| Red Hat | RHEL-8 based Middleware Containers |
Unaffected:
7.13.5-4.1777325711 , < *
(rpm)
cpe:/a:redhat:rhosemc:1.0::el8 |
|
| Red Hat | RHEL-8 based Middleware Containers |
Unaffected:
7.13.5-4.1777325710 , < *
(rpm)
cpe:/a:redhat:rhosemc:1.0::el8 |
|
| Red Hat | RHEL-8 based Middleware Containers |
Unaffected:
7.13.5-3.1777325680 , < *
(rpm)
cpe:/a:redhat:rhosemc:1.0::el8 |
|
| Red Hat | RHEL-8 based Middleware Containers |
Unaffected:
7.13.5-4.1777325709 , < *
(rpm)
cpe:/a:redhat:rhosemc:1.0::el8 |
|
| Red Hat | RHEL-8 based Middleware Containers |
Unaffected:
7.13.5-4.1777325680 , < *
(rpm)
cpe:/a:redhat:rhosemc:1.0::el8 |
|
| Red Hat | RHEL-8 based Middleware Containers |
Unaffected:
7.13.5-4.1777325708 , < *
(rpm)
cpe:/a:redhat:rhosemc:1.0::el8 |
|
| Red Hat | Red Hat AI Inference Server 3.2 |
Unaffected:
1780681984 , < *
(rpm)
cpe:/a:redhat:ai_inference_server:3.2::el9 |
|
| Red Hat | Red Hat AI Inference Server 3.3 |
Unaffected:
1782352950 , < *
(rpm)
cpe:/a:redhat:ai_inference_server:3.3::el9 |
|
| Red Hat | Red Hat AI Inference Server 3.3 |
Unaffected:
1782352919 , < *
(rpm)
cpe:/a:redhat:ai_inference_server:3.3::el9 |
|
| Red Hat | Red Hat AI Inference Server 3.3 |
Unaffected:
1782353093 , < *
(rpm)
cpe:/a:redhat:ai_inference_server:3.3::el9 |
|
| Red Hat | Red Hat AI Inference Server 3.3 |
Unaffected:
1782352847 , < *
(rpm)
cpe:/a:redhat:ai_inference_server:3.3::el9 |
|
| Red Hat | Red Hat Enterprise Linux AI 3.3 |
Unaffected:
1776871984 , < *
(rpm)
cpe:/a:redhat:enterprise_linux_ai:3.3::el9 |
|
| Red Hat | Red Hat Enterprise Linux AI 3.3 |
Unaffected:
1776871985 , < *
(rpm)
cpe:/a:redhat:enterprise_linux_ai:3.3::el9 |
|
| Red Hat | Red Hat Enterprise Linux AI 3.3 |
Unaffected:
1776872005 , < *
(rpm)
cpe:/a:redhat:enterprise_linux_ai:3.3::el9 |
|
| Red Hat | Red Hat Enterprise Linux AI 3.3 |
Unaffected:
1776773390 , < *
(rpm)
cpe:/a:redhat:enterprise_linux_ai:3.3::el9 |
|
| Red Hat | Red Hat Enterprise Linux AI 3.3 |
Unaffected:
1776871987 , < *
(rpm)
cpe:/a:redhat:enterprise_linux_ai:3.3::el9 |
|
| Red Hat | Red Hat Enterprise Linux AI 3.3 |
Unaffected:
1776773505 , < *
(rpm)
cpe:/a:redhat:enterprise_linux_ai:3.3::el9 |
|
| Red Hat | Red Hat Enterprise Linux AI 3.3 |
Unaffected:
1776938871 , < *
(rpm)
cpe:/a:redhat:enterprise_linux_ai:3.3::el9 |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
3.13.13-1.1.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
3.11.15-4.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
3.12.13-3.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
3.14.4-2.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1777459441 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1777454300 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1777459504 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1779798159 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1779798164 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1779798165 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1779798222 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux AI (RHEL AI) 3 |
cpe:/a:redhat:enterprise_linux_ai:3 |
Credits
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CVE-2026-6047 (GCVE-0-2026-6047)
Vulnerability from cvelistv5 – Published: 2026-06-15 16:22 – Updated: 2026-06-15 18:11
VLAI
EPSS
VEX
Title
Heap buffer overflow in OOXML text box element import
Summary
LibreOffice can import documents in the OOXML format (DOCX). A heap buffer overflow existed when replaying deferred parser events for a text box element. A handler object was assumed to be of one type and written to at that type's field layout, but it could be a smaller object, so the write landed past the end of the allocation. In fixed versions the type is checked before the write.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Document Foundation | LibreOffice |
Affected:
25.8 , < < 25.8.7
(25.8 series)
Affected: 26.2 , < < 26.2.3 (26.2 series) |
Date Public
2026-06-15 00:00
Credits
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CVE-2026-6045 (GCVE-0-2026-6045)
Vulnerability from cvelistv5 – Published: 2026-06-15 16:22 – Updated: 2026-06-15 18:13
VLAI
EPSS
VEX
Title
Heap buffer overflow in EMF+ gradient brush import
Summary
LibreOffice can import EMF+ graphics, which may be embedded in documents. A heap buffer overflow existed when importing an EMF+ gradient brush. The number of gradient blend points was read from the file and used to compute an allocation size, but that multiplication could overflow, so a small buffer was allocated and then filled as if it were large, writing past its end. In fixed versions the blend-point count is checked against the data actually available before allocating.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Document Foundation | LibreOffice |
Affected:
25.8 , < < 25.8.7
(25.8 series)
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Date Public
2026-06-15 00:00
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CVE-2026-6040 (GCVE-0-2026-6040)
Vulnerability from cvelistv5 – Published: 2026-06-15 16:21 – Updated: 2026-07-15 00:41
VLAI
EPSS
VEX
Title
Heap use-after-free in ODF number-format blank-width parsing
Summary
A heap use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the document was not checked against the length of the format-code string, so a malformed number format could be processed against memory outside that string. In fixed versions the position is bounds-checked before use.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://www.libreoffice.org/about-us/security/adv… | |
| https://access.redhat.com/security/cve/CVE-2026-6040 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2488966 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| The Document Foundation | LibreOffice |
Affected:
25.8 , < < 25.8.7
(25.8 series)
Affected: 26.2 , < < 26.2.3 (26.2 series) |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-15 00:00
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CVE-2026-6039 (GCVE-0-2026-6039)
Vulnerability from cvelistv5 – Published: 2026-06-15 16:21 – Updated: 2026-06-15 18:17
VLAI
EPSS
VEX
Title
Heap buffer overflow in DXF polyline import
Summary
LibreOffice can import drawings in the DXF format used by CAD software. A heap buffer overflow existed when importing a DXF polyline. The point count taken from the file was truncated to a 16-bit value when the point buffer was sized, while the full count was used to fill it, so a polyline whose point count exceeded the 16-bit range was written past the end of the buffer. In fixed versions such oversized polylines are rejected.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Document Foundation | LibreOffice |
Affected:
25.8 , < < 25.8.7
(25.8 series)
Affected: 26.2 , < < 26.2.3 (26.2 series) |
Date Public
2026-06-15 00:00
Credits
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Mitigation MIT-3
Requirements
Strategy: Language Selection
- Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer.
- Be wary that a language's interface to native code may still be subject to overflows, even if the language itself is theoretically safe.
Mitigation MIT-4.1
Architecture and Design
Strategy: Libraries or Frameworks
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- Examples include the Safe C String Library (SafeStr) by Messier and Viega [REF-57], and the Strsafe.h library from Microsoft [REF-56]. These libraries provide safer versions of overflow-prone string-handling functions.
Mitigation MIT-10
Operation
Build and Compilation
Strategy: Environment Hardening
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
- D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
Mitigation MIT-9
Implementation
- Consider adhering to the following rules when allocating and managing an application's memory:
- Double check that the buffer is as large as specified.
- When using functions that accept a number of bytes to copy, such as strncpy(), be aware that if the destination buffer size is equal to the source buffer size, it may not NULL-terminate the string.
- Check buffer boundaries if accessing the buffer in a loop and make sure there is no danger of writing past the allocated space.
- If necessary, truncate all input strings to a reasonable length before passing them to the copy and concatenation functions.
Mitigation MIT-11
Operation
Build and Compilation
Strategy: Environment Hardening
- Run or compile the software using features or extensions that randomly arrange the positions of a program's executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
- Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as "rebasing" (for Windows) and "prelinking" (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
- For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].
Mitigation MIT-12
Operation
Strategy: Environment Hardening
- Use a CPU and operating system that offers Data Execution Protection (using hardware NX or XD bits) or the equivalent techniques that simulate this feature in software, such as PaX [REF-60] [REF-61]. These techniques ensure that any instruction executed is exclusively at a memory address that is part of the code segment.
- For more information on these techniques see D3-PSEP (Process Segment Execution Prevention) from D3FEND [REF-1336].
Mitigation MIT-13
Implementation
Replace unbounded copy functions with analogous functions that support length arguments, such as strcpy with strncpy. Create these if they are not available.
No CAPEC attack patterns related to this CWE.