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CVE-2026-66393Patch(nltk / nltk)

LOWCVSS 8.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch nltk nltk systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

NLTK versions before 3.9.4 contain an unbounded recursion vulnerability in JSONTaggedDecoder.decode_obj() that allows attackers to cause denial of service by supplying deeply nested JSON structures. Attackers can craft JSON payloads exceeding the recursion limit to trigger an unhandled RecursionError that crashes the Python process.

nltk CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Exploit / PoC references
Vendor / third-party advisories
Weakness type (CWE)
CWE-674

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • nltk

Threat summary

  • Patch or workaround signal is available
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
nltk
Products
nltk

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-08-23: 1Patch / Workaround · 2026-08-23: 1Technical Details · 2026-08-23: 108-23
Signal classification1 categories
Patch
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters
    Patch

    CVE-2026-66393 - DoS vulnerability in NLTK. Deeply nested JSON triggers unhandled recursion crash in Python. CVSS 7.5. Update to 3.9.4 immediately. https://www.valtersit.com/cve/CVE-2026-66393/ #Python #infosec #CVE #CVEAlert #infosec #SysAdmin #cybersecurity #Linux #devsecops #devops #developer #sysadmin #100daysofcode #git #github #gitlab #redteam #blueteam #ethicalhacker #ethicalhacking #cybersecurityawareness #cybersecurity #cybersecuritynews #cybersecuritytips #python #hacker #linux #kali #ubuntu #debian #ukraine #spain #ireland #unitedkingdom #canada #finland #estonia #lithuania #ireland #hungary #denmark #norway #malta #mexico #switczerland #iceland #israel

    Post summary

    This post highlights a DoS vulnerability in NLTK (CVE‑2026‑66393), provides technical details and a CVSS score, and urges users to update to version 3.9.4 to remediate the issue.

    0000052
    1.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
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