CVE-2026-80206Medium· 5.9▾ SunlitA flaw was found in NLTK, specifically within its tgrep module. This vulnerability, known as Regular Expression Denial of Service (ReDoS), allows a remote attacker to provide specially crafted regular expressions. When processed, these exp…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 32.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 2.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.3%
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0.3% → 0.4%
Last analysed / modified upstream
— → 5.9
high → medium
A flaw was found in NLTK, specifically within its tgrep module. This vulnerability, known as Regular Expression Denial of Service (ReDoS), allows a remote attacker to provide specially crafted regular expressions. When processed, these expressions can cause indefinite CPU saturation, leading to a complete denial of service for the Python process utilizing the NLTK library.
nltk: NLTK: Denial of Service vulnerability in tgrep module — rated Moderate by Red Hat. Released 2026-08-26, updated 2026-10-15.
Affected:
No fix planned:
Out of support scope
Workarounds / mitigations:
Affected packages:
nltk < 3.10.3Patched in:
nltk 3.10.3Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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