CVE-2026-11979
published 2026-06-29CVE-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…
PriorityP344high7.8CVSS 3.1
AVLACLPRNUIRSUCHIHAH
EPSS
0.15%
4.7th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| podman_project | podman | — | — |
| xmlsoft | libxml2 | <= 2.15.3 | — |
| xmlsoft | libxml2 | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvdv4.01.8LOWCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat1.8LOW
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GHSA
libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --shell mode.
ghsa_unreviewed·2026-06-29
CVE-2026-11979 [LOW] CWE-121 libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --shell mode.
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.
Red Hat
libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow
vendor_redhat·2026-06-29·CVSS 1.8
CVE-2026-11979 [LOW] CWE-120 libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow
libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow
A flaw was found in libxml2, specifically within the xmlcatalog utility when operating in shell mode. An attacker can exploit multiple stack-based buffer overflows by providing an excessively long input line. This leads to memory corruption, which may cause the application to crash or potentially allow the attacker to execute arbitrary code within the context of the xmlcatalog process.
Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Package: libxml2 (Red Hat Enterprise Linux 10) - Fix deferred
Package: libxm
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-11979 libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow
bugzilla·2026-06-29·CVSS 1.8
CVE-2026-11979 [LOW] CVE-2026-11979 libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow
CVE-2026-11979 libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow
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
Bugzilla
CVE-2026-11979 libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
bugzilla·2026-06-29·CVSS 1.8
CVE-2026-11979 [LOW] CVE-2026-11979 libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
CVE-2026-11979 libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 p
Bugzilla
CVE-2026-11979 mingw-libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [epel-all]
bugzilla·2026-06-29·CVSS 1.8
CVE-2026-11979 [LOW] CVE-2026-11979 mingw-libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [epel-all]
CVE-2026-11979 mingw-libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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
Bugzilla
CVE-2026-11979 mingw-libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
bugzilla·2026-06-29·CVSS 1.8
CVE-2026-11979 [LOW] CVE-2026-11979 mingw-libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
CVE-2026-11979 mingw-libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 cras
Bugzilla
CVE-2026-11979 pcem: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
bugzilla·2026-06-29·CVSS 1.8
CVE-2026-11979 [LOW] CVE-2026-11979 pcem: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
CVE-2026-11979 pcem: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 pote
Bugzilla
CVE-2026-11979 qt5-qtwebengine: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [epel-all]
bugzilla·2026-06-29·CVSS 1.8
CVE-2026-11979 [LOW] CVE-2026-11979 qt5-qtwebengine: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [epel-all]
CVE-2026-11979 qt5-qtwebengine: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 cras
Bugzilla
CVE-2026-11979 qt5-qtwebengine: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
bugzilla·2026-06-29·CVSS 1.8
CVE-2026-11979 [LOW] CVE-2026-11979 qt5-qtwebengine: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
CVE-2026-11979 qt5-qtwebengine: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 cr
Bugzilla
CVE-2026-11979 qt6-qtwebengine: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [epel-all]
bugzilla·2026-06-29·CVSS 1.8
CVE-2026-11979 [LOW] CVE-2026-11979 qt6-qtwebengine: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [epel-all]
CVE-2026-11979 qt6-qtwebengine: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 cras
2026-06-29
Published