Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
NLTK before 3.10.3 contains a regular expression denial of service (ReDoS) vulnerability in the tgrep module. The _tgrep_node_action function compiles user-supplied regular expressions embedded in /regex/ pattern nodes and executes them via re.search against tree node labels without any validation or timeout. An attacker who controls the tgrep pattern (e.g., via tgrep_positions() or tgrep_compile() exposed to external input) can supply a pattern that triggers catastrophic backtracking, causing indefinite CPU saturation that blocks the Python process.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
🔴 NLTK, Regular Expression Denial of Service (ReDoS), #CVE-2026-80206 (High) -DC-Sep2026-2252 https://dailycve.com/nltk-regular-expression-denial-of-service-redos-cve-2026-80206-high-dc-sep2026-2252/
Post summary
A new CVE-2026-80206, a Regular Expression Denial of Service in NLTK, is announced with a High severity rating. The post lacks any details about PoC, exploitation tools, or patches.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | nltk | nltk | - | - | - |