CVE-2026-6653

CVE-2026-6653 affects GNOME libxml2, specifically the parser path libxml2’s xmlParseInternalSubset. The issue is a Use After Free in libxml2 versions 2.9.11 to 2.11.0, allowing a remote attacker to trigger a denial of service via carefully crafted XML input with improper entity resolution handlin...

CVE-2026-11979

CVE-2026-11979 affects libxml2 in the xmlcatalog utility when run in --shell mode. The usershell() function reads input into fixed-size stack buffers without proper bounds checking, allowing an overly long input line to overflow buffers (command, arg, argv) and cause stack memory corruption. Cons...

CVE-2026-0989

CVE-2026-0989 concerns a flaw in the RelaxNG parser in libxml2 where external schema inclusions can cause unbounded recursion, leading to stack exhaustion and denial-of-service crashes. The connected documents confirm this issue across multiple distributions (e.g., Amazon Linux 2/ALAS advisories,...

CVE-2026-0990

Vulnerability: CVE-2026-0990 affects libxml2. An uncontrolled recursion bug in xmlCatalogXMLResolveURI is triggered when a delegate URI entry references itself, allowing a remote attacker to craft an XML catalog that causes infinite recursion and stack exhaustion, resulting in DoS via application...

CVE-2026-6732

CVE-2026-6732 affects libxml2 and is triggered when parsing an XSD-validated document that contains an internal entity reference, causing a type confusion error and a DoS via crashes. The vulnerability is tied to how libxml2 processes crafted XML Schema Definition inputs, with the impact describe...

CVE-2026-0992

CVE-2026-0992 in libxml2 describes an uncontrolled resource consumption vulnerability. A remote attacker can supply crafted XML catalogs containing repeated elements pointing to the same downstream catalog, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU us...

CVE-2026-86137

libxml2 before version 2.15.4 contains an out-of-bounds read in the xmlFAParsePosCharGroup function, specifically within the NXT macro in the xmlregexp module. An attacker can trigger the flaw by feeding specially crafted XML input to an application using the vulnerable library, causing the compo...

CVE-2026-86140

CVE-2026-86140 affects libxml2 versions prior to 2.15.4 . The vulnerability resides in the xmlSnprintfElements function within valid.c , where a strcat call causes a stack-based buffer overflow . The CVSS 3.1 score is 8.0 (HIGH) with a local attack vector, low complexity, and no privileges or use...

CVE-2026-86138

CVE-2026-86138 affects libxml2 before version 2.15.4 . The root cause is an integer overflow in the xmlDictAddQString function (dict.c), which results in a heap-based buffer overflow . A local attacker can leverage this to execute arbitrary code , compromising system integrity and confidentiality...

CVE-2026-86142

CVE-2026-86142 is a heap-based buffer overflow in libxml2 before 2.15.4 , triggered in the xmlXPtrEvalXPtrPart function. The root cause is an integer overflow (xpointer length saturation) while processing an oversized xpointer() expression, leading to incorrect memory allocation and an out-of-bou...

CVE-2026-86144

libxml2 versions before 2.15.4 contain a flaw in the XInclude processing functions xmlXIncludeProcess and xmlXIncludeProcessTree , which fail to propagate parser flags such as XML_PARSE_NONET . When a custom resource loader is used, this allows network access during XInclude expansion, potentiall...

CVE-2026-86139

libxml2 before 2.15.4 contains an integer overflow in the xmlURIEscapeStr function within uri.c. The upstream fix (commit 8edbbdb0) adds a zero-length guard after xmlStrlen to catch cases where the function returns 0 for a non-empty input, preventing the overflow. According to Red Hat, the flaw c...

CVE-2026-86143

libxml2 before 2.15.4 has an integer overflow in the xmlIO module. An inconsistency between xmlOutputWriteCallback and xmlBufUse causes negative length values to reach downstream write callbacks when data backlogs exceed maximum integer limits (approximately 2 GiB ). This can lead to data corrupt...

CVE-2026-86141

libxml2 versions before 2.15.4 contain a NULL pointer dereference in the xmlregexp module, specifically in the xmlRegNewParserCtxt function. The root cause is a missing string length calculation after a strdup failure and NULL check, leading to a potential crash. The CVSS 3.1 score is 2.9 (Low) w...