Fallos del tipo CWE-191

399 resultados

Subfluxo de inteiro (estouro negativo)

Ocorre quando uma operação aritmética subtrai um valor maior de um inteiro não assinado, causando wraparound: o resultado "volta" para um número muito grande em vez de ficar negativo. Um inteiro de 8 bits sem sinal (0-255), ao subtrair 1 de 0, vira 255. Isso quebra lógica de validação e pode ser explorado para contornar limites de segurança, alocar memória inadequada ou acessar áreas indevidas.

Ejemplo

Um sistema de download que valida se o tamanho solicitado cabe em buffer: se recebe tamanho=0 e subtrai um header de 10 bytes, a conta (0 - 10) em inteiro não assinado resulta em 4.294.967.286 bytes em uma arquitetura de 32 bits, enganando a validação e causando overflow no buffer.

Cómo mitigar

Sempre validar entrada antes de operações aritméticas; usar tipos assinados quando desejar representar negativos; implementar verificações de limites (p.ex., se A < B antes de calcular A - B); usar ferramentas estáticas ou sanitizers (AddressSanitizer, UBSan) para detectar wraparound em tempo de desenvolvimento.

CVE-2026-3084HIGHGStreamer H.266 Codec Parser Integer Underflow Remote Code Execution VulnerabilityEPSS 0.4%CVE-2026-51540CRITICALOpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by an integer underflow in the prEPSS 0.4%CVE-2026-54890HIGHBEAM VM crash via integer underflow in binary_to_term BIT_BINARY_EXT decodingEPSS 0.4%CVE-2026-2369MEDIUMLibsoup: libsoup: buffer overread due to integer underflow when handling zero-length resourcesEPSS 0.4%CVE-2024-5256MEDIUMSonos Era 100 SMB2 Message Handling Integer Underflow Information Disclosure VulnerabilityEPSS 0.4%CVE-2026-37534CRITICALInteger underflow vulnerability in Open-SAE-J1939 thru commit b6caf884df46435e539b1ecbf92b6c29b345bdfe (2025-11-30) in SAE_J1939_Read_TranspEPSS 0.4%CVE-2025-1991HIGHIBM Informix Dynamic Server denial of serviceEPSS 0.4%CVE-2025-59242HIGHWindows Ancillary Function Driver for WinSock Elevation of Privilege VulnerabilityEPSS 0.4%CVE-2026-54412HIGHMQTT-C Heap Out-of-Bounds Read and Integer Underflow in mqtt_unpack_publish_response()EPSS 0.4%CVE-2026-54413HIGHiso14229 Integer Underflow and Out-of-Bounds Read in Handle_0x27_SecurityAccess()EPSS 0.4%CVE-2026-68827HIGHWindows GDI+ Elevation of Privilege VulnerabilityEPSS 0.4%CVE-2026-50300MEDIUMWindows DWM Core Library Information Disclosure VulnerabilityEPSS 0.4%CVE-2024-53954HIGHAnimate | Integer Underflow (Wrap or Wraparound) (CWE-191)EPSS 0.4%CVE-2020-14378—An integer underflow in dpdk versions before 18.11.10 and before 19.11.5 in the `move_desc` function can lead to large amounts of CPU cyclesEPSS 0.4%CVE-2026-42268HIGHModSecurity: Unsigned integer underflow in @verifySSN / @verifyCPF / @verifySVNR operatorsEPSS 0.4%CVE-2026-69303MEDIUMPush Message Routing Service Information Disclosure VulnerabilityEPSS 0.4%CVE-2019-1628MEDIUMCisco Integrated Management Controller Denial of Service VulnerabilityEPSS 0.4%CVE-2025-59368MEDIUMAn integer underflow vulnerability has been identified in Aicloud. An authenticated attacker may trigger this vulnerability by sending a craEPSS 0.4%CVE-2023-39413HIGHMultiple integer underflow vulnerabilities exist in the LXT2 lxt2_rd_iter_radix shift operation functionality of GTKWave 3.3.115. A speciallEPSS 0.4%CVE-2026-33999HIGHXorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handlingEPSS 0.4%