Report generation date: 2025-08-26

Project overview: xmlsec

High level conclusions

Fuzzers reach 16.42% of cyclomatic complexity.

Fuzzers reach 15.30% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

564 / 3685

Cyclomatic complexity statically reachable by fuzzers

7098 / 43212

Runtime code coverage of functions

460 / 3685

Fuzzers overview

Fuzzer	Fuzzer filename	Functions Reached	Functions unreached	Fuzzer depth	Files reached	Basic blocks reached	Cyclomatic complexity	Details
xmlsec_fuzzer	xmlsec/tests/oss-fuzz/xmlsec_target.c	599	3156	44	32	17751	7169	xmlsec_target.c

Project functions overview

The following table shows data about each function in the project. The functions included in this table correspond to all functions that exist in the executables of the fuzzers. As such, there may be functions that are from third-party libraries.

For further technical details on the meaning of columns in the below table, please see the Glossary .

Func name	Functions filename	Args	Function call depth	Reached by Fuzzers	Runtime reached by Fuzzers	Combined reached by Fuzzers	Fuzzers runtime hit	Func lines hit %	I Count	BB Count	Cyclomatic complexity	Functions reached	Reached by functions	Accumulated cyclomatic complexity	Undiscovered complexity

Fuzzer details

Fuzzer: xmlsec_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Full calltree

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color Runtime hitcount Callsite count Percentage

red 0 1081 44.1%

gold [1:9] 57 2.32%

yellow [10:29] 28 1.14%

greenyellow [30:49] 19 0.77%

lawngreen 50+ 1262 51.5%

All colors 2447 100

Color	Runtime hitcount	Callsite count	Percentage
red	0	1081	44.1%
gold	[1:9]	57	2.32%
yellow	[10:29]	28	1.14%
greenyellow	[30:49]	19	0.77%
lawngreen	50+	1262	51.5%
All colors	2447	100

Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity	Unique Reachable Complexities	Unique Reachable Functions	All non-covered Complexity	All Reachable Complexity	Function Name	Function Callsite	Blocked Branch
1613	1613	1 : View List ['xmlValidateOneElement']	1613	1617	xmlSAX2EndElementNs	call site: 00000	/src/libxml2/SAX2.c:2428
1562	1562	1 : View List ['xmlParseStartTag']	2293	4148	xmlParseElementStart	call site: 00795	/src/libxml2/parser.c:9734
1132	2221	8 : View List ['strlen', 'xmlStrstr', 'xmlResolvePath', 'xmlNormalizeURIPath', 'xmlParseURISafe', 'xmlSaveUri', 'xmlFreeURI', 'xmlCreateURI']	1132	2230	xmlBuildURISafe	call site: 01816	/src/libxml2/uri.c:1984
1023	1023	1 : View List ['xmlParseEndTag1']	1038	1038	xmlParseElementEnd	call site: 01231	/src/libxml2/parser.c:9833
914	2166	4 : View List ['xmlDetectEncoding', 'xmlStrEqual', 'xmlParseTextDecl', 'xmlFatalErrMsg']	914	10903	xmlCtxtParseContentInternal	call site: 01421	/src/libxml2/parser.c:11695
776	813	2 : View List ['xmlNewNs', 'xmlNsWarnMsg']	2206	8414	xmlSAX2StartElementNs	call site: 00000	/src/libxml2/SAX2.c:2311
739	739	1 : View List ['xmlSwitchInputEncodingName']	739	739	xmlCtxtNewInputFromMemory	call site: 00174	/src/libxml2/parserInternals.c:1929
739	739	1 : View List ['xmlSwitchInputEncodingName']	739	739	xmlCtxtNewInputFromString	call site: 00665	/src/libxml2/parserInternals.c:1990
678	1181	2 : View List ['xmlNodeParseAttValue', 'xmlFreeProp']	882	1385	xmlNewDocProp	call site: 01514	/src/libxml2/tree.c:1644
678	678	1 : View List ['xmlNodeParseAttValue']	882	882	xmlNewElem	call site: 01279	/src/libxml2/tree.c:1855
546	546	1 : View List ['htmlNewDocNoDtD']	866	866	xmlSAX2StartDocument	call site: 00000	/src/libxml2/SAX2.c:800
521	521	1 : View List ['xmlSBufReportError']	521	521	xmlSBufFinish	call site: 00981	/src/libxml2/parser.c:796

Runtime coverage analysis

Covered functions

461

Functions that are reachable but not covered

193

Reachable functions

599

Percentage of reachable functions covered

67.78%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
xmlsec/tests/oss-fuzz/xmlsec_target.c	2
libxml2/error.c	17
libxml2/globals.c	20
libxml2/threads.c	9
libxml2/dict.c	20
libxml2/xmlmemory.c	1
libxml2/encoding.c	15
libxml2/xpath.c	2
libxml2/xmlIO.c	15
libxml2/catalog.c	33
libxml2/xmlschemastypes.c	1
libxml2/relaxng.c	1
xmlsecbuffer.c	9
xmlsecerrors.c	1
libxml2/xmlstring.c	17
xmlsecparser.c	3
libxml2/parser.c	141
libxml2/parserInternals.c	40
libxml2/./include/private/threads.h	3
libxml2/SAX2.c	6
libxml2/buf.c	19
libxml2/hash.c	26
libxml2/tree.c	65
libxml2/./include/private/memory.h	1
libxml2/HTMLparser.c	3
libxml2/chvalid.c	1
libxml2/./include/private/parser.h	2
libxml2/uri.c	35
libxml2/entities.c	10
libxml2/valid.c	40
libxml2/list.c	3
libxml2/xmlregexp.c	4

Analyses and suggestions

Optimal target analysis

Remaining optimal interesting functions

The following table shows a list of functions that are optimal targets. Optimal targets are identified by finding the functions that in combination, yield a high code coverage.

Func name	Functions filename	Arg count	Args	Function depth	instr count	bb count	cyclomatic complexity	Reachable functions	Incoming references	total cyclomatic complexity	Unreached complexity
`xmlSchemaValidateStream`	/src/libxml2/xmlschemas.c	5	['N/A', 'N/A', 'int', 'N/A', 'N/A']	54	150	24	10	1187	0	16080	9004
`xmlSecXsltPushBin`	/src/xmlsec/src/xslt.c	5	['N/A', 'N/A', 'size_t', 'int', 'N/A']	33	836	202	85	1177	0	14619	7284
`xsltLoadStylesheetPI`	/src/libxslt/libxslt/xslt.c	1	['N/A']	30	410	68	26	858	0	10167	2346
`xmlTextReaderRelaxNGValidate`	/src/libxml2/xmlreader.c	2	['N/A', 'N/A']	49	20	3	2	974	0	12540	1696
`xmlSecEncCtxDecrypt`	/src/xmlsec/src/xmlenc.c	2	['N/A', 'N/A']	30	160	33	15	751	0	9054	1613
`xmlTextReaderNextTree`	/src/libxml2/xmlreader.c	1	['N/A']	61	192	24	11	976	3	12590	1253
`xmlSecTransformC14NPopBin`	/src/xmlsec/src/c14n.c	5	['N/A', 'N/A', 'size_t', 'N/A', 'N/A']	19	836	216	96	294	0	2999	612

Implementing fuzzers that target the above functions will improve reachability such that it becomes:

Functions statically reachable by fuzzers

2252 / 3685

Cyclomatic complexity statically reachable by fuzzers

30863 / 43212

All functions overview

If you implement fuzzers for these functions, the status of all functions in the project will be:

Func name	Functions filename	Args	Function call depth	Reached by Fuzzers	Runtime reached by Fuzzers	Combined reached by Fuzzers	Fuzzers runtime hit	Func lines hit %	I Count	BB Count	Cyclomatic complexity	Functions reached	Reached by functions	Accumulated cyclomatic complexity	Undiscovered complexity

Fuzz engine guidance

This sections provides heuristics that can be used as input to a fuzz engine when running a given fuzz target. The current focus is on providing input that is usable by libFuzzer.

xmlsec/tests/oss-fuzz/xmlsec_target.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['xmlBuildURISafe', 'xmlSplitQName4', 'xmlHashFindEntry', 'xmlHashUpdateInternal', 'xmlURIUnescapeString', 'xmlExpandPEsInEntityValue', 'nodePush', 'xmlSkipBlankCharsPE', 'xmlCtxtParseContentInternal', 'xmlParseAttValue']

Runtime coverage analysis

This section shows analysis of runtime coverage data.

For futher technical details on how this section is generated, please see the Glossary .

Complex functions with low coverage

Func name	Function total lines	Lines covered at runtime	percentage covered	Reached by fuzzers
xmlSAX2ExternalSubset	76	7	9.210%	['xmlsec_fuzzer']
xmlSAX2StartDocument	40	20	50.0%	['xmlsec_fuzzer']
xmlSAX2StartElementNs	193	101	52.33%	['xmlsec_fuzzer']
xmlSAX2AttributeNs	144	69	47.91%	['xmlsec_fuzzer']
xmlSAX2TextNode	62	21	33.87%	['xmlsec_fuzzer']
xmlErrString	321	140	43.61%	['xmlsec_fuzzer']
xmlNewNs	41	18	43.90%	['xmlsec_fuzzer']
xmlNewDtd	35	19	54.28%	['xmlsec_fuzzer']
xmlStaticCopyNodeList	63	19	30.15%	['xmlsec_fuzzer']
xmlNodeGetContent	47	17	36.17%	['xmlsec_fuzzer']
xmlBuildURISafe	237	15	6.329%	['xmlsec_fuzzer']
xmlAddRef	62	34	54.83%	['xmlsec_fuzzer']
xmlDoErrValid	35	16	45.71%	['xmlsec_fuzzer']
xmlNewInputBufferMemory	33	15	45.45%	['xmlsec_fuzzer']
xmlParserInputBufferGrow	52	17	32.69%	['xmlsec_fuzzer']

Files and Directories in report

This section shows which files and directories are considered in this report. The main reason for showing this is fuzz introspector may include more code in the reasoning than is desired. This section helps identify if too many files/directories are included, e.g. third party code, which may be irrelevant for the threat model. In the event too much is included, fuzz introspector supports a configuration file that can exclude data from the report. See the following link for more information on how to create a config file: link

Files in report

Source file	Reached by	Covered by
	[]	[]
/src/libxslt/libxslt/xsltlocale.c	[]	[]
/src/libxml2/xmlregexp.c	['xmlsec_fuzzer']	[]
/src/xmlsec/src/xslt.c	[]	[]
/src/xmlsec/src/xmlenc.c	[]	[]
/src/libxml2/xmlreader.c	[]	[]
/src/libxml2/./timsort.h	[]	[]
/src/libxml2/./include/private/parser.h	['xmlsec_fuzzer']	[]
/src/xmlsec/src/c14n.c	[]	[]
/src/libxml2/./include/private/memory.h	['xmlsec_fuzzer']	[]
/src/libxslt/libxslt/xslt.c	[]	[]
/src/xmlsec/src/xmltree.c	[]	[]
/src/libxslt/libxslt/transform.c	[]	[]
/src/xmlsec/src/membuf.c	[]	[]
/src/libxslt/libxslt/attrvt.c	[]	[]
/src/libxslt/libxslt/attributes.c	[]	[]
/src/xmlsec/src/xmlsec.c	[]	[]
/src/libxml2/catalog.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/xpath.c	[]	[]
/src/libxml2/chvalid.c	['xmlsec_fuzzer']	[]
/src/libxml2/parser.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxslt/libxslt/security.c	[]	[]
/src/xmlsec/src/parser.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxml2/xmlschemastypes.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/transforms.c	[]	[]
/src/xmlsec/src/buffer.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/keysmngr.c	[]	[]
/src/libxml2/tree.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxml2/xmlschemas.c	[]	[]
/src/xmlsec/src/enveloped.c	[]	[]
/src/libxml2/dict.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxml2/globals.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/base64.c	[]	[]
/src/libxml2/threads.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxml2/xmlstring.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxml2/valid.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxslt/libxslt/namespaces.c	[]	[]
/src/libxml2/xpath.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/keyinfo.c	[]	[]
/src/libxml2/entities.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/nodeset.c	[]	[]
/src/libxml2/xmlmemory.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/keys.c	[]	[]
/src/libxml2/c14n.c	[]	[]
/src/libxml2/SAX2.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/relationship.c	[]	[]
/src/libxml2/parserInternals.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/errors.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/list.c	[]	[]
/src/libxslt/libxslt/documents.c	[]	[]
/src/libxml2/xmlsave.c	[]	[]
/src/libxslt/libxslt/imports.c	[]	[]
/src/libxml2/HTMLparser.c	['xmlsec_fuzzer']	[]
/src/libxml2/xinclude.c	[]	[]
/src/libxml2/pattern.c	[]	[]
/src/libxslt/libxslt/functions.c	[]	[]
/src/libxslt/libxslt/variables.c	[]	[]
/src/libxml2/buf.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxslt/libxslt/preproc.c	[]	[]
/src/libxml2/error.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxslt/libxslt/pattern.c	[]	[]
/src/xmlsec/tests/oss-fuzz/xmlsec_target.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxslt/libxslt/xsltutils.c	[]	[]
/src/libxml2/./include/private/threads.h	['xmlsec_fuzzer']	[]
/src/libxml2/uri.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxslt/libxslt/templates.c	[]	[]
/src/libxml2/relaxng.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxml2/hash.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxml2/HTMLtree.c	[]	[]
/src/libxslt/libxslt/extensions.c	[]	[]
/src/libxml2/xpointer.c	[]	[]
/src/libxslt/libxslt/keys.c	[]	[]
/src/libxslt/libxslt/numbers.c	[]	[]
/src/xmlsec/src/io.c	[]	[]
/src/libxml2/./codegen/unicode.inc	[]	[]
/src/libxml2/debugXML.c	[]	[]
/src/libxml2/list.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/xmlsec/src/keysdata.c	[]	[]
/src/libxml2/xmlIO.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxml2/encoding.c	['xmlsec_fuzzer']	['xmlsec_fuzzer']
/src/libxslt/libxslt/extra.c	[]	[]

Directories in report

Directory

/src/libxslt/libxslt/
/src/libxml2/./codegen/
/src/libxml2/./
/src/xmlsec/src/
/src/libxml2/
/src/libxml2/./include/private/
/src/xmlsec/tests/oss-fuzz/

Metadata section

This sections shows the raw data that is used to produce this report. This is mainly used for further processing and developer debugging.

Fuzzer Calltree file Program data file Coverage file

xmlsec_fuzzer fuzzerLogFile-0-0SDktQdo5N.data fuzzerLogFile-0-0SDktQdo5N.data.yaml xmlsec_fuzzer.covreport

Table of contents

Project overview: xmlsec

High level conclusions

Reachability and coverage overview

Fuzzers overview

Project functions overview

Fuzzer details

Fuzzer: xmlsec_fuzzer

Call tree

Fuzz blockers

Runtime coverage analysis

Files reached

Analyses and suggestions

Optimal target analysis

Remaining optimal interesting functions

All functions overview

Fuzz engine guidance

xmlsec/tests/oss-fuzz/xmlsec_target.c

Dictionary

Fuzzer function priority

Runtime coverage analysis

Complex functions with low coverage

Files and Directories in report

Files in report

Directories in report

Metadata section