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CWE-149 (引号语法转义处理不恰当) — Vulnerability Class 5

5 vulnerabilities classified as CWE-149 (引号语法转义处理不恰当). AI Chinese analysis included.

CWE-149 represents a critical input validation weakness where improper handling of quoting syntax allows attackers to manipulate data interpretation. This flaw typically arises when software fails to correctly escape, ignore, or process quote characters within user-supplied input. Exploitation occurs when an attacker injects malicious quotes, causing the parsing engine to misinterpret the structure of the data. This misinterpretation can lead to unexpected actions, such as altering command execution, bypassing security filters, or injecting malicious payloads into downstream processes. To mitigate this risk, developers must implement rigorous input validation and sanitization strategies. Specifically, they should consistently escape or encode quote characters according to the specific context and parser requirements. By ensuring that quotes are treated strictly as data rather than executable syntax, developers prevent attackers from disrupting the logical flow of the application and maintain system integrity against injection-based attacks.

MITRE CWE Description
Quotes injected into a product can be used to compromise a system. As data are parsed, an injected/absent/duplicate/malformed use of quotes may cause the process to take unexpected actions.
Common Consequences (1)
IntegrityUnexpected State
Mitigations (4)
Developers should anticipate that quotes will be injected/removed/manipulated in the input vectors of their product. Use an appropriate combination of denylists and allowlists to ensure only valid, expected and appropriate input is processed by the system.
ImplementationAssume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range…
ImplementationWhile it is risky to use dynamically-generated query strings, code, or commands that mix control and data together, sometimes it may be unavoidable. Properly quote arguments and escape any special characters within those arguments. The most conservative approach is to escape or filter all characters that do not pass an extremely strict allowlist (such as everything that is not alphanumeric or whit…
ImplementationInputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
CVE IDTitleCVSSSeverityPublished
CVE-2026-42511 Remote code execution via malicious DHCP options — FreeBSD 8.8 -2026-04-30
CVE-2018-25135 Anviz AIM CrossChex Standard 4.3.6.0 CSV Injection via User Import — Anviz AIM CrossChex Standard 9.8 Critical2025-12-24
CVE-2025-43878 F5OS-A/C CLI vulnerability — F5OS - Appliance 6.0 Medium2025-05-07
CVE-2025-1094 PostgreSQL quoting APIs miss neutralizing quoting syntax in text that fails encoding validation — PostgreSQL 8.1 High2025-02-13
CVE-2023-36479 Jetty vulnerable to errant command quoting in CGI Servlet — jetty.project 3.5 Low2023-09-15

Vulnerabilities classified as CWE-149 (引号语法转义处理不恰当) represent 5 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.