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Common Weakness Enumeration

CWE-1333

Allowed

Inefficient Regular Expression Complexity

Abstraction: Base · Status: Draft

The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

812 vulnerabilities reference this CWE, most recent first.

CVE-2026-54284 (GCVE-0-2026-54284)

Vulnerability from cvelistv5 – Published: 2026-08-17 17:43 – Updated: 2026-08-17 19:32
VLAI
Title
sqlparse: TokenList.__init__ materializes O(subtree) value per group, causing CPU DoS before depth/token caps trigger
Summary
sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, TokenList construction and string conversion in sqlparse/sql.py repeatedly flatten nested token subtrees constructed by group_parenthesis and group_case, causing quadratic CPU consumption through sqlparse.parse(), sqlparse.format(), and sqlparse.split() before depth and token limits terminate processing. This issue is fixed in version 0.6.0.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:31 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
  • CWE-1333 - Inefficient Regular Expression Complexity
References
Impacted products
Vendor Product Version
andialbrecht sqlparse Affected: < 0.6.0
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Show details on NVD website

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CVE-2026-54268 (GCVE-0-2026-54268)

Vulnerability from cvelistv5 – Published: 2026-06-22 15:31 – Updated: 2026-06-23 16:09
VLAI
Title
Angular: Denial of Service (DoS) via OOM in Date Formatting (formatDate)
Summary
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.1, 21.2.17, and 20.3.25, a Denial of Service (DoS) vulnerability exists in the @angular/common package of the Angular framework. The formatDate function, which is also utilized by the standard Angular DatePipe, does not properly limit or validate the length of the format parameter. When parsing a maliciously crafted, excessively long date format string (e.g., a repeating pattern or very large string), the internal parser splits the string iteratively using a regular expression loop. This results in uncontrolled resource consumption (high CPU utilization and excessive memory allocations), leading to a Denial of Service (DoS). This vulnerability is fixed in 22.0.1, 21.2.17, and 20.3.25.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-23 16:07 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-1333 - Inefficient Regular Expression Complexity
Impacted products
Vendor Product Version
angular angular Affected: >= 22.0.0-next.0 < 22.0.1
Affected: >= 21.0.0-next.0 < 21.2.17
Affected: >= 20.0.0-next.0 < 20.3.25
Affected: <= 19.2.25
Create a notification for this product.
Show details on NVD website

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CVE-2026-52794 (GCVE-0-2026-52794)

Vulnerability from cvelistv5 – Published: 2026-06-24 21:26 – Updated: 2026-06-25 13:52
VLAI
Title
Sentry: Inefficient Regular Expression Complexity in sentry
Summary
Sentry is an error tracking and performance monitoring tool. From 24.4.0 until 26.5.2, a Regular Expression Denial of Service (ReDoS) vulnerability exists in Sentry's event ingestion pipeline, where a regex applied to attacker-controlled fields on incoming events can be made to consume disproportionate CPU time. This vulnerability is fixed in 26.5.2.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-25 13:52 UTC
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
References
Impacted products
Vendor Product Version
getsentry sentry Affected: >= 24.4.0, < 26.5.2
Create a notification for this product.
Show details on NVD website

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CVE-2026-52778 (GCVE-0-2026-52778)

Vulnerability from cvelistv5 – Published: 2026-06-08 18:24 – Updated: 2026-06-09 15:56
VLAI
Title
YesWiki has Unsafe eval() in Formula Calculator - Remote Code Execution (RCE) & Denial of Service (DoS)
Summary
YesWiki is a wiki system written in PHP. Prior to version 4.6.6, an unsafe execution vulnerability exists in the Bazar form field calculator (CalcField.php) of YesWiki. The application attempts to sanitize user-defined mathematical formulas using a complex recursive regular expression before passing them to the PHP eval() function. This implementation is inherently flawed: it is vulnerable to Regular Expression Denial of Service (ReDoS / Stack Overflow) which can crash the server, and it creates a high-risk architecture where any logic bypass directly results in arbitrary PHP code execution. Version 4.6.6 patches the issue.
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-09 15:54 UTC
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
  • CWE-1333 - Inefficient Regular Expression Complexity
Impacted products
Vendor Product Version
YesWiki yeswiki Affected: < 4.6.6
Create a notification for this product.
Show details on NVD website

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CVE-2026-52746 (GCVE-0-2026-52746)

Vulnerability from cvelistv5 – Published: 2026-07-17 18:32 – Updated: 2026-08-03 20:50
VLAI
Title
JSONata: Malicious inputs to "$toMillis" function can cause resource exhaustion
Summary
JSONata is a JSON query and transformation language. Prior to 2.2.0 and 1.8.9, malicious non-matching inputs to the $toMillis function can cause superlinear backtracking in the ISO-8601 validation regex, leading to denial of service in applications that evaluate user-provided JSONata expressions. This issue is fixed in version 2.2.0 and 1.8.9.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 19:44 UTC
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Impacted products
Vendor Product Version
jsonata-js jsonata Affected: >= 2.0.0, < 2.2.0
Affected: < 1.8.9
Create a notification for this product.
Show details on NVD website

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CVE-2026-49485 (GCVE-0-2026-49485)

Vulnerability from cvelistv5 – Published: 2026-07-17 20:59 – Updated: 2026-07-20 13:45
VLAI
Title
HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint
Summary
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.9 and 6.9.4.2, all implementations of FHIRPathEngine accept arbitrary FHIRPath expressions and evaluate them without input validation, and the FHIRPath functions matches(), matchesFull(), and replaceMatches() pass user-controlled regular expressions to Java's Pattern.compile() and String.replaceAll() through an incomplete timeout utility. An attacker can send a resource containing an evil regex pattern that causes catastrophic backtracking, exhausting CPU resources and causing denial of service in the FHIR Validator HTTP endpoint and affected org.hl7.fhir.* modules. This issue is fixed in versions 6.9.9 and 6.9.4.2.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 13:45 UTC
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
  • CWE-400 - Uncontrolled Resource Consumption
Impacted products
Vendor Product Version
hapifhir org.hl7.fhir.core Affected: < 6.9.4.2
Affected: >= 6.9.5, < 6.9.9
Create a notification for this product.
Show details on NVD website

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CVE-2026-49477 (GCVE-0-2026-49477)

Vulnerability from cvelistv5 – Published: 2026-07-14 20:51 – Updated: 2026-07-21 14:49
VLAI
Title
Soup Sieve: Regular Expression Denial of Service (ReDoS) in soupsieve Selector Parser
Summary
Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve contains a regular expression vulnerable to catastrophic backtracking when processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select() / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-21 14:49 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-1333 - Inefficient Regular Expression Complexity
Impacted products
Vendor Product Version
facelessuser soupsieve Affected: < 2.8.4
Create a notification for this product.
Show details on NVD website

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CVE-2026-49293 (GCVE-0-2026-49293)

Vulnerability from cvelistv5 – Published: 2026-06-19 18:14 – Updated: 2026-06-22 14:10
VLAI
Title
CPU exhaustion via O(n^2) BigInt construction on radix-prefixed integer literals
Summary
js-toml is a TOML parser for JavaScript, fully compliant with the TOML 1.0.0 Spec. Versions up to and including 1.1.0 parse hexadecimal / octal / binary integer literals via a hand-written `parseBigInt` loop that multiplies a `BigInt` accumulator by the radix once per input digit. Each iteration performs a `BigInt * BigInt` operation on an accumulator that grows linearly with the number of digits already consumed, so the whole loop is O(n²) in the literal length. The lexer regex places no upper bound on the literal length, so a single TOML document containing one ~500 kB hex literal pins one CPU core for ~40 seconds on a modern laptop (Apple M-series, Node v22). Memory amplification is bounded but CPU amplification is severe and grows quadratically: doubling the literal length quadruples the work. A caller that invokes `load()` on attacker-controlled TOML (configuration upload endpoints, CI/CD systems ingesting third-party `*.toml`, IDE plugins, build tools) is exposed to a single-request CPU exhaustion DoS. Version 1.1.1 fixes the issue.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-22 14:09 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-407 - Inefficient Algorithmic Complexity
  • CWE-1333 - Inefficient Regular Expression Complexity
Impacted products
Vendor Product Version
sunnyadn js-toml Affected: < 1.1.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-48801 (GCVE-0-2026-48801)

Vulnerability from cvelistv5 – Published: 2026-07-14 20:03 – Updated: 2026-07-15 12:56
VLAI
Title
linkify-it: Quadratic algorithmic complexity in LinkifyIt#match scan loop
Summary
linkify-it is a links recognition library with full Unicode support. Prior to 5.0.1, LinkifyIt.prototype.match, the package's primary public API, has O(N²) algorithmic complexity for inputs containing many fuzzy links or emails because the JavaScript-level scan loop re-slices input and re-runs unanchored regex searches on progressively shorter tails. Any service that synchronously renders untrusted Markdown with linkify:true on a request hot path can inherit a worker-process denial of service triggerable by a tens-of-KB request body. This issue is fixed in version 5.0.1.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 12:56 UTC
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
References
Impacted products
Vendor Product Version
markdown-it linkify-it Affected: < 5.0.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-48125 (GCVE-0-2026-48125)

Vulnerability from cvelistv5 – Published: 2026-07-14 20:54 – Updated: 2026-07-15 12:55
VLAI
Title
UAParser.js: Unbounded `Sec-CH-UA-Model` parsing can trigger ReDoS in `withClientHints()`
Summary
UAParser.js is a JavaScript library to detect browsers, operating systems, CPUs, and devices from user-agent data. From 2.0.1 until 2.0.10, a regular expression denial-of-service vulnerability exists when using the Client Hints API. By sending a crafted Sec-CH-UA-Model header to an application that calls UAParser(headers).withClientHints(), an attacker can cause excessive CPU time due to catastrophic backtracking in the device regex because Client Hints values are copied without the UA_MAX_LENGTH limit used for User-Agent values. This issue is fixed in version 2.0.10.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 12:55 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-1333 - Inefficient Regular Expression Complexity
Impacted products
Vendor Product Version
faisalman ua-parser-js Affected: >= 2.0.1, < 2.0.10
Create a notification for this product.
Show details on NVD website

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Mitigation
Architecture and Design

Use regular expressions that do not support backtracking, e.g. by removing nested quantifiers.

Mitigation
System Configuration

Set backtracking limits in the configuration of the regular expression implementation, such as PHP's pcre.backtrack_limit. Also consider limits on execution time for the process.

Mitigation
Implementation

Do not use regular expressions with untrusted input. If regular expressions must be used, avoid using backtracking in the expression.

Mitigation
Implementation

Limit the length of the input that the regular expression will process.

CAPEC-492: Regular Expression Exponential Blowup

An adversary may execute an attack on a program that uses a poor Regular Expression(Regex) implementation by choosing input that results in an extreme situation for the Regex. A typical extreme situation operates at exponential time compared to the input size. This is due to most implementations using a Nondeterministic Finite Automaton(NFA) state machine to be built by the Regex algorithm since NFA allows backtracking and thus more complex regular expressions.