0.8.2

No user-facing changes.

0.8.1

New Queries

The query cpp/redundant-null-check-simple has been promoted to Code Scanning. The query finds cases where a pointer is compared to null after it has already been dereferenced. Such comparisons likely indicate a bug at the place where the pointer is dereferenced, or where the pointer is compared to null.

Note: This query was incorrectly noted as being promoted to Code Scanning in CodeQL version 2.14.6.

0.8.0

Query Metadata Changes

The cpp/double-free query has been further improved to reduce false positives and its precision has been increased from medium to high.
The cpp/use-after-free query has been further improved to reduce false positives and its precision has been increased from medium to high.

Minor Analysis Improvements

The queries cpp/double-free and cpp/use-after-free find fewer false positives in cases where a non-returning function is called.
The number of duplicated dataflow paths reported by queries has been significantly reduced.

0.7.5

No user-facing changes.

0.7.4

New Queries

Added a new query, cpp/invalid-pointer-deref, to detect out-of-bounds pointer reads and writes.

Minor Analysis Improvements

The "Comparison where assignment was intended" query (cpp/compare-where-assign-meant) no longer reports comparisons that appear in macro expansions.
Some queries that had repeated results corresponding to different levels of indirection for argv now only have a single result.
The cpp/non-constant-format query no longer considers an assignment on the right-hand side of another assignment to be a source of non-constant format strings. As a result, the query may now produce fewer results.

0.7.3

No user-facing changes.

0.7.2

No user-facing changes.

0.7.1

Minor Analysis Improvements

The cpp/uninitialized-local query now excludes uninitialized uses that are explicitly cast to void and are expression statements. As a result, the query will report less false positives.

0.7.0

Minor Analysis Improvements

The cpp/comparison-with-wider-type query now correctly handles relational operations on signed operators. As a result the query may find more results.

0.6.4

No user-facing changes.

0.6.3

New Queries

Added a new query, cpp/overrun-write, to detect buffer overflows in C-style functions that manipulate buffers.

0.6.2

No user-facing changes.

0.6.1

New Queries

A new query cpp/double-free has been added. The query finds possible cases of deallocating the same pointer twice. The precision of the query has been set to "medium".
The query cpp/use-after-free has been modernized and assigned the precision "medium". The query finds cases of where a pointer is dereferenced after its memory has been deallocated.

0.6.0

New Queries

The query cpp/redundant-null-check-simple has been promoted to Code Scanning. The query finds cases where a pointer is compared to null after it has already been dereferenced. Such comparisons likely indicate a bug at the place where the pointer is dereferenced, or where the pointer is compared to null.

Minor Analysis Improvements

The query cpp/tainted-arithmetic now also flags possible overflows in arithmetic assignment operations.

0.5.6

No user-facing changes.

0.5.5

Deprecated Queries

The NetworkToBufferSizeConfiguration and UntrustedDataToExternalApiConfig dataflow configurations have been deprecated. Please use NetworkToBufferSizeFlow and UntrustedDataToExternalApiFlow.
The LeapYearCheckConfiguration, FiletimeYearArithmeticOperationCheckConfiguration, and PossibleYearArithmeticOperationCheckConfiguration dataflow configurations have been deprecated. Please use LeapYearCheckFlow, FiletimeYearArithmeticOperationCheckFlow and PossibleYearArithmeticOperationCheckFlow.

0.5.4

No user-facing changes.

0.5.3

No user-facing changes.

0.5.2

No user-facing changes.

0.5.1

Minor Analysis Improvements

The cpp/no-space-for-terminator and cpp/uncontrolled-allocation-size queries have been enhanced with heuristic detection of allocations. These queries now find more results.

0.5.0

Minor Analysis Improvements

The AlertSuppression.ql query has been updated to support the new // codeql[query-id] supression comments. These comments can be used to suppress an alert and must be placed on a blank line before the alert. In addition the legacy // lgtm and // lgtm[query-id] comments can now also be placed on the line before an alert.
The cpp/missing-check-scanf query no longer reports the free'ing of scanf output variables as potential reads.

0.4.6

No user-facing changes.

0.4.5

No user-facing changes.

0.4.4

No user-facing changes.

0.4.3

Minor Analysis Improvements

Fixed a bug in cpp/jsf/av-rule-76 that caused the query to miss results when an implicitly-defined copy constructor or copy assignment operator was generated.

0.4.2

New Queries

Added a new medium-precision query, cpp/comma-before-misleading-indentation, which detects instances of whitespace that have readability issues.

Minor Analysis Improvements

The "Unterminated variadic call" (cpp/unterminated-variadic-call) query has been tuned to produce fewer false positive results.
Fixed false positives from the "Unused static function" (cpp/unused-static-function) query in files that had errors during compilation.

0.4.1

Minor Analysis Improvements

The alert message of many queries have been changed to better follow the style guide and make the message consistent with other languages.

0.4.0

New Queries

Added a new medium-precision query, cpp/missing-check-scanf, which detects scanf output variables that are used without a proper return-value check to see that they were actually written. A variation of this query was originally contributed as an experimental query by @ihsinme.

Minor Analysis Improvements

Modernizations from "Cleartext storage of sensitive information in buffer" (cpp/cleartext-storage-buffer) have been ported to the "Cleartext storage of sensitive information in file" (cpp/cleartext-storage-file), "Cleartext transmission of sensitive information" (cpp/cleartext-transmission) and "Cleartext storage of sensitive information in an SQLite database" (cpp/cleartext-storage-database) queries. These changes may result in more correct results and fewer false positive results from these queries.
The alert message of many queries have been changed to make the message consistent with other languages.

0.3.4

0.3.3

Minor Analysis Improvements

The "Cleartext storage of sensitive information in buffer" (cpp/cleartext-storage-buffer) query has been improved to produce fewer false positives.

0.3.2

Minor Analysis Improvements

The query cpp/bad-strncpy-size now covers more strncpy-like functions than before, including strxfrm(_l), wcsxfrm(_l), and stpncpy. Users of this query may see an increase in results.

0.3.1

0.3.0

Breaking Changes

Contextual queries and the query libraries they depend on have been moved to the codeql/cpp-all package.

0.2.0

0.1.4

0.1.3

Minor Analysis Improvements

The "XML external entity expansion" (cpp/external-entity-expansion) query precision has been increased to high.
The cpp/unused-local-variable no longer ignores functions that include if and switch statements with C++17-style initializers.

0.1.2

Minor Analysis Improvements

The "XML external entity expansion" (cpp/external-entity-expansion) query has been extended to support a broader selection of XML libraries and interfaces.

0.1.1

New Queries

An new query cpp/external-entity-expansion has been added. The query detects XML objects that are vulnerable to external entity expansion (XXE) attacks.

0.1.0

Minor Analysis Improvements

The cpp/cleartext-transmission query now recognizes additional sources, for sensitive private data such as e-mail addresses and credit card numbers.
The cpp/unused-local-variable no longer ignores functions that include lambda expressions capturing trivially copyable objects.
The cpp/command-line-injection query now takes into account calling contexts across string concatenations. This removes false positives due to mismatched calling contexts before and after string concatenations.
A new query, "Potential exposure of sensitive system data to an unauthorized control sphere" (cpp/potential-system-data-exposure) has been added. This query is focused on exposure of information that is highly likely to be sensitive, whereas the similar query "Exposure of system data to an unauthorized control sphere" (cpp/system-data-exposure) is focused on exposure of information on a channel that is more likely to be intercepted by an attacker.

0.0.13

0.0.12

Minor Analysis Improvements

The cpp/overflow-destination, cpp/unclear-array-index-validation, and cpp/uncontrolled-allocation-size queries have been modernized and converted to path-problem queries and provide more true positive results.
The cpp/system-data-exposure query has been increased from medium to high precision, following a number of improvements to the query logic.

0.0.11

Breaking Changes

The deprecated queries cpp/duplicate-block, cpp/duplicate-function, cpp/duplicate-class, cpp/duplicate-file, cpp/mostly-duplicate-function,cpp/similar-file, cpp/duplicated-lines-in-files have been removed.

Deprecated Predicates and Classes

The predicates and classes in the CodeDuplication library have been deprecated.

New Queries

A new query titled "Use of expired stack-address" (cpp/using-expired-stack-address) has been added. This query finds accesses to expired stack-allocated memory that escaped via a global variable.
A new cpp/insufficient-key-size query has been added to the default query suite for C/C++. The query finds uses of certain cryptographic algorithms where the key size is too small to provide adequate encryption strength.

Minor Analysis Improvements

The "Failure to use HTTPS URLs" (cpp/non-https-url) has been improved reducing false positive results, and its precision has been increased to 'high'.
The cpp/system-data-exposure query has been modernized and has converted to a path-problem query. There are now fewer false positive results.

0.0.10

Deprecated Classes

The CodeDuplication.Copy, CodeDuplication.DuplicateBlock, and CodeDuplication.SimilarBlock classes have been deprecated.

0.0.9

New Queries

Added a new query, cpp/open-call-with-mode-argument, to detect when open or openat is called with the O_CREAT or O_TMPFILE flag but when the mode argument is omitted.

Minor Analysis Improvements

The "Cleartext transmission of sensitive information" (cpp/cleartext-transmission) query has been further improved to reduce false positive results, and upgraded from medium to high precision.
The "Cleartext transmission of sensitive information" (cpp/cleartext-transmission) query now finds more results, where a password is stored in a struct field or class member variable.
The cpp/cleartext-storage-file query has been improved, removing false positives where data is written to a standard output stream.
The cpp/cleartext-storage-buffer query has been updated to use the semmle.code.cpp.dataflow.TaintTracking library.
The cpp/world-writable-file-creation query now only detects open and openat calls with the O_CREAT or O_TMPFILE flag.

0.0.8

New Queries

The security tag has been added to the cpp/return-stack-allocated-memory query. As a result, its results will now appear by default.
The "Uncontrolled data in arithmetic expression" (cpp/uncontrolled-arithmetic) query has been enhanced to reduce false positive results and its @precision increased to high.
A new cpp/very-likely-overrunning-write query has been added to the default query suite for C/C++. The query reports some results that were formerly flagged by cpp/overrunning-write.

Minor Analysis Improvements

Fix an issue with the cpp/declaration-hides-variable query where it would report variables that are unnamed in a database.
The cpp/cleartext-storage-file query has been upgraded with non-local taint flow and has been converted to a path-problem query.
The cpp/return-stack-allocated-memory query has been improved to produce fewer false positives. The query has also been converted to a path-problem query.
The "Cleartext transmission of sensitive information" (cpp/cleartext-transmission) query has been improved in several ways to reduce false positive results.
The "Potential improper null termination" (cpp/improper-null-termination) query now produces fewer false positive results around control flow branches and loops.
Added exception for GLib's gboolean to cpp/ambiguously-signed-bit-field. This change reduces the number of false positives in the query.

0.0.7

0.0.6

0.0.5

New Queries

A new query cpp/certificate-not-checked has been added for C/C++. The query flags unsafe use of OpenSSL and similar libraries.
A new query cpp/certificate-result-conflation has been added for C/C++. The query flags unsafe use of OpenSSL and similar libraries.

0.0.4

New Queries

A new query cpp/non-https-url has been added for C/C++. The query flags uses of http URLs that might be better replaced with https.

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