Vulnerability Details CVE-2026-11979
libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --shell mode. The usershell() function processes user input using fixed-size stack buffers without proper bounds checking.
By supplying an overly long input line, an attacker can overflow internal buffers (command, arg, and argv) during input parsing. This results in memory corruption within the stack frame.
Successful exploitation may cause a crash or potentially allow arbitrary code execution in the context of the xmlcatalog process.
This issue has been fixed in the commit c2e233fc.
NOTE:
The maintainers of this project did not agree that this issue is a vulnerability and considered it a bug.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 4.7%
CVSS Severity
CVSS v3 Score 7.8
Products affected by CVE-2026-11979
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cpe:2.3:a:xmlsoft:libxml2:-
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cpe:2.3:a:xmlsoft:libxml2:1.7.0
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cpe:2.3:a:xmlsoft:libxml2:1.7.1
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cpe:2.3:a:xmlsoft:libxml2:1.7.2
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cpe:2.3:a:xmlsoft:libxml2:1.7.3
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cpe:2.3:a:xmlsoft:libxml2:1.7.4
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cpe:2.3:a:xmlsoft:libxml2:1.8.0
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cpe:2.3:a:xmlsoft:libxml2:1.8.1
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cpe:2.3:a:xmlsoft:libxml2:1.8.10
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cpe:2.3:a:xmlsoft:libxml2:1.8.13
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cpe:2.3:a:xmlsoft:libxml2:1.8.14
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cpe:2.3:a:xmlsoft:libxml2:1.8.16
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cpe:2.3:a:xmlsoft:libxml2:1.8.2
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cpe:2.3:a:xmlsoft:libxml2:1.8.3
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cpe:2.3:a:xmlsoft:libxml2:1.8.4
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cpe:2.3:a:xmlsoft:libxml2:1.8.5
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cpe:2.3:a:xmlsoft:libxml2:1.8.6
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cpe:2.3:a:xmlsoft:libxml2:1.8.7
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cpe:2.3:a:xmlsoft:libxml2:1.8.9
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cpe:2.3:a:xmlsoft:libxml2:2.0.0
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cpe:2.3:a:xmlsoft:libxml2:2.1.0
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cpe:2.3:a:xmlsoft:libxml2:2.1.1
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cpe:2.3:a:xmlsoft:libxml2:2.10.0
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cpe:2.3:a:xmlsoft:libxml2:2.10.1
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cpe:2.3:a:xmlsoft:libxml2:2.10.2
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cpe:2.3:a:xmlsoft:libxml2:2.10.3
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cpe:2.3:a:xmlsoft:libxml2:2.10.4
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cpe:2.3:a:xmlsoft:libxml2:2.11.0
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cpe:2.3:a:xmlsoft:libxml2:2.11.1
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cpe:2.3:a:xmlsoft:libxml2:2.11.2
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cpe:2.3:a:xmlsoft:libxml2:2.11.3
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cpe:2.3:a:xmlsoft:libxml2:2.11.4
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cpe:2.3:a:xmlsoft:libxml2:2.11.5
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cpe:2.3:a:xmlsoft:libxml2:2.11.7
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cpe:2.3:a:xmlsoft:libxml2:2.11.8
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cpe:2.3:a:xmlsoft:libxml2:2.11.9
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cpe:2.3:a:xmlsoft:libxml2:2.12.0
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cpe:2.3:a:xmlsoft:libxml2:2.12.1
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cpe:2.3:a:xmlsoft:libxml2:2.12.10
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cpe:2.3:a:xmlsoft:libxml2:2.12.2
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cpe:2.3:a:xmlsoft:libxml2:2.12.3
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cpe:2.3:a:xmlsoft:libxml2:2.12.4
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cpe:2.3:a:xmlsoft:libxml2:2.12.5
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cpe:2.3:a:xmlsoft:libxml2:2.12.6
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cpe:2.3:a:xmlsoft:libxml2:2.12.7
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cpe:2.3:a:xmlsoft:libxml2:2.12.8
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cpe:2.3:a:xmlsoft:libxml2:2.12.9
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cpe:2.3:a:xmlsoft:libxml2:2.13.0
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cpe:2.3:a:xmlsoft:libxml2:2.13.1
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cpe:2.3:a:xmlsoft:libxml2:2.13.2
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cpe:2.3:a:xmlsoft:libxml2:2.13.3
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cpe:2.3:a:xmlsoft:libxml2:2.13.4
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cpe:2.3:a:xmlsoft:libxml2:2.13.5
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cpe:2.3:a:xmlsoft:libxml2:2.13.6
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cpe:2.3:a:xmlsoft:libxml2:2.13.8
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cpe:2.3:a:xmlsoft:libxml2:2.13.9
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cpe:2.3:a:xmlsoft:libxml2:2.14.0
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cpe:2.3:a:xmlsoft:libxml2:2.14.1
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cpe:2.3:a:xmlsoft:libxml2:2.14.2
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cpe:2.3:a:xmlsoft:libxml2:2.14.3
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cpe:2.3:a:xmlsoft:libxml2:2.14.4
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cpe:2.3:a:xmlsoft:libxml2:2.14.5
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cpe:2.3:a:xmlsoft:libxml2:2.14.6
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cpe:2.3:a:xmlsoft:libxml2:2.15.0
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cpe:2.3:a:xmlsoft:libxml2:2.15.1
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cpe:2.3:a:xmlsoft:libxml2:2.15.2
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cpe:2.3:a:xmlsoft:libxml2:2.15.3
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cpe:2.3:a:xmlsoft:libxml2:2.2.0
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cpe:2.3:a:xmlsoft:libxml2:2.2.1
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cpe:2.3:a:xmlsoft:libxml2:2.2.10
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cpe:2.3:a:xmlsoft:libxml2:2.2.11
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cpe:2.3:a:xmlsoft:libxml2:2.2.2
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cpe:2.3:a:xmlsoft:libxml2:2.2.3
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cpe:2.3:a:xmlsoft:libxml2:2.2.4
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cpe:2.3:a:xmlsoft:libxml2:2.2.5
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cpe:2.3:a:xmlsoft:libxml2:2.2.6
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cpe:2.3:a:xmlsoft:libxml2:2.2.7
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cpe:2.3:a:xmlsoft:libxml2:2.2.8
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cpe:2.3:a:xmlsoft:libxml2:2.2.9
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cpe:2.3:a:xmlsoft:libxml2:2.3.0
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cpe:2.3:a:xmlsoft:libxml2:2.3.1
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cpe:2.3:a:xmlsoft:libxml2:2.3.10
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cpe:2.3:a:xmlsoft:libxml2:2.3.11
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cpe:2.3:a:xmlsoft:libxml2:2.3.12
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cpe:2.3:a:xmlsoft:libxml2:2.3.13
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cpe:2.3:a:xmlsoft:libxml2:2.3.14
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cpe:2.3:a:xmlsoft:libxml2:2.3.2
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cpe:2.3:a:xmlsoft:libxml2:2.3.3
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cpe:2.3:a:xmlsoft:libxml2:2.3.4
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cpe:2.3:a:xmlsoft:libxml2:2.3.5
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cpe:2.3:a:xmlsoft:libxml2:2.3.6
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cpe:2.3:a:xmlsoft:libxml2:2.3.7
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cpe:2.3:a:xmlsoft:libxml2:2.3.8
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cpe:2.3:a:xmlsoft:libxml2:2.3.9
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cpe:2.3:a:xmlsoft:libxml2:2.4.1
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cpe:2.3:a:xmlsoft:libxml2:2.4.10
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cpe:2.3:a:xmlsoft:libxml2:2.4.11
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cpe:2.3:a:xmlsoft:libxml2:2.4.12
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cpe:2.3:a:xmlsoft:libxml2:2.4.13
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cpe:2.3:a:xmlsoft:libxml2:2.4.14
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cpe:2.3:a:xmlsoft:libxml2:2.4.15
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cpe:2.3:a:xmlsoft:libxml2:2.4.16
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cpe:2.3:a:xmlsoft:libxml2:2.4.17
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cpe:2.3:a:xmlsoft:libxml2:2.4.18
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cpe:2.3:a:xmlsoft:libxml2:2.4.19
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cpe:2.3:a:xmlsoft:libxml2:2.4.2
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cpe:2.3:a:xmlsoft:libxml2:2.4.20
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cpe:2.3:a:xmlsoft:libxml2:2.4.21
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cpe:2.3:a:xmlsoft:libxml2:2.4.22
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cpe:2.3:a:xmlsoft:libxml2:2.4.23
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cpe:2.3:a:xmlsoft:libxml2:2.4.24
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cpe:2.3:a:xmlsoft:libxml2:2.4.25
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cpe:2.3:a:xmlsoft:libxml2:2.4.26
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cpe:2.3:a:xmlsoft:libxml2:2.4.27
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cpe:2.3:a:xmlsoft:libxml2:2.4.28
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cpe:2.3:a:xmlsoft:libxml2:2.4.29
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cpe:2.3:a:xmlsoft:libxml2:2.4.3
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cpe:2.3:a:xmlsoft:libxml2:2.4.30
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cpe:2.3:a:xmlsoft:libxml2:2.4.4
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cpe:2.3:a:xmlsoft:libxml2:2.4.5
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cpe:2.3:a:xmlsoft:libxml2:2.4.6
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cpe:2.3:a:xmlsoft:libxml2:2.4.7
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cpe:2.3:a:xmlsoft:libxml2:2.4.8
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cpe:2.3:a:xmlsoft:libxml2:2.4.9
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cpe:2.3:a:xmlsoft:libxml2:2.5.0
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cpe:2.3:a:xmlsoft:libxml2:2.5.1
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cpe:2.3:a:xmlsoft:libxml2:2.5.10
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cpe:2.3:a:xmlsoft:libxml2:2.5.11
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cpe:2.3:a:xmlsoft:libxml2:2.5.2
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cpe:2.3:a:xmlsoft:libxml2:2.5.3
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cpe:2.3:a:xmlsoft:libxml2:2.5.4
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cpe:2.3:a:xmlsoft:libxml2:2.5.5
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cpe:2.3:a:xmlsoft:libxml2:2.5.6
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cpe:2.3:a:xmlsoft:libxml2:2.5.7
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cpe:2.3:a:xmlsoft:libxml2:2.5.8
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cpe:2.3:a:xmlsoft:libxml2:2.5.9
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cpe:2.3:a:xmlsoft:libxml2:2.6.0
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cpe:2.3:a:xmlsoft:libxml2:2.6.1
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cpe:2.3:a:xmlsoft:libxml2:2.6.10
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cpe:2.3:a:xmlsoft:libxml2:2.6.11
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cpe:2.3:a:xmlsoft:libxml2:2.6.12
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cpe:2.3:a:xmlsoft:libxml2:2.6.13
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cpe:2.3:a:xmlsoft:libxml2:2.6.14
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cpe:2.3:a:xmlsoft:libxml2:2.6.15
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cpe:2.3:a:xmlsoft:libxml2:2.6.16
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cpe:2.3:a:xmlsoft:libxml2:2.6.17
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cpe:2.3:a:xmlsoft:libxml2:2.6.18
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cpe:2.3:a:xmlsoft:libxml2:2.6.19
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cpe:2.3:a:xmlsoft:libxml2:2.6.2
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cpe:2.3:a:xmlsoft:libxml2:2.6.20
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cpe:2.3:a:xmlsoft:libxml2:2.6.21
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cpe:2.3:a:xmlsoft:libxml2:2.6.22
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cpe:2.3:a:xmlsoft:libxml2:2.6.23
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cpe:2.3:a:xmlsoft:libxml2:2.6.24
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cpe:2.3:a:xmlsoft:libxml2:2.6.25
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cpe:2.3:a:xmlsoft:libxml2:2.6.26
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cpe:2.3:a:xmlsoft:libxml2:2.6.27
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cpe:2.3:a:xmlsoft:libxml2:2.6.28
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cpe:2.3:a:xmlsoft:libxml2:2.6.29
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cpe:2.3:a:xmlsoft:libxml2:2.6.3
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cpe:2.3:a:xmlsoft:libxml2:2.6.30
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cpe:2.3:a:xmlsoft:libxml2:2.6.31
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cpe:2.3:a:xmlsoft:libxml2:2.6.32
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cpe:2.3:a:xmlsoft:libxml2:2.6.4
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cpe:2.3:a:xmlsoft:libxml2:2.6.5
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cpe:2.3:a:xmlsoft:libxml2:2.6.6
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cpe:2.3:a:xmlsoft:libxml2:2.6.7
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cpe:2.3:a:xmlsoft:libxml2:2.6.8
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cpe:2.3:a:xmlsoft:libxml2:2.6.9
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cpe:2.3:a:xmlsoft:libxml2:2.7.0
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cpe:2.3:a:xmlsoft:libxml2:2.7.1
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cpe:2.3:a:xmlsoft:libxml2:2.7.2
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cpe:2.3:a:xmlsoft:libxml2:2.7.3
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cpe:2.3:a:xmlsoft:libxml2:2.7.4
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cpe:2.3:a:xmlsoft:libxml2:2.7.5
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cpe:2.3:a:xmlsoft:libxml2:2.7.6
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cpe:2.3:a:xmlsoft:libxml2:2.7.7
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cpe:2.3:a:xmlsoft:libxml2:2.7.8
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cpe:2.3:a:xmlsoft:libxml2:2.8.0
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cpe:2.3:a:xmlsoft:libxml2:2.9.0
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cpe:2.3:a:xmlsoft:libxml2:2.9.1
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cpe:2.3:a:xmlsoft:libxml2:2.9.10
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cpe:2.3:a:xmlsoft:libxml2:2.9.11
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cpe:2.3:a:xmlsoft:libxml2:2.9.12
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cpe:2.3:a:xmlsoft:libxml2:2.9.13
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cpe:2.3:a:xmlsoft:libxml2:2.9.14
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cpe:2.3:a:xmlsoft:libxml2:2.9.2
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cpe:2.3:a:xmlsoft:libxml2:2.9.3
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cpe:2.3:a:xmlsoft:libxml2:2.9.4
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cpe:2.3:a:xmlsoft:libxml2:2.9.5
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cpe:2.3:a:xmlsoft:libxml2:2.9.6
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cpe:2.3:a:xmlsoft:libxml2:2.9.7
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cpe:2.3:a:xmlsoft:libxml2:2.9.8
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cpe:2.3:a:xmlsoft:libxml2:2.9.9