SEPTEMBER 14, 2026
Live Feed
Back to database
Case File

CVE-2026-81724

MEDIUM · CVSS 5.3 EPSS 0.27% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-27 · Last synced 2026-09-14

CyberRota Analysis

AI-Generated

NLTK versions prior to 3.10.3 are vulnerable to an uncontrolled recursion issue in the FeatStructReader, which can be exploited by unauthenticated attackers to induce a denial of service. By submitting deeply nested feature-structure inputs, attackers can exceed Python's recursion limit, leading to application crashes. Organizations using NLTK for parsing user-supplied feature structures or grammars should prioritize upgrading to mitigate this risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-81724
Severity
MEDIUM
CVSS
5.3
EPSS
0.27%

Original NVD Description

NLTK before 3.10.3 contains an uncontrolled recursion vulnerability in nltk.featstruct.FeatStructReader that allows unauthenticated attackers to cause a denial of service by supplying deeply nested feature-structure input. Attackers can craft trivial payloads with nested brackets that exceed Python's recursion limit and raise an unhandled RecursionError, crashing applications that parse user-supplied feature structures or feature grammars.

Related CVEs

Other vulnerabilities affecting the same vendor(s)