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T-43M
01
Record
STATE: —
02
Description
SRC: CNA
03
Metadata
SCHEMA: CVE JSON 5
04
Affected products
PAIRS: —
05
References
REFS: —
01
Record
STATE: PUBLISHED
CVE-2026-72818
NLTK TweetTokenizer URL Pattern Backtracks Catastrophically on Naked-Domain-Like Input
High
PUBLISHED
CNA: VulnCheck
Base score
8.7
CVSS v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
View raw JSON
CVE Program record
02
Description
CNA: VulnCheck
NLTK TweetTokenizer URL Pattern Backtracks Catastrophically on Naked-Domain-Like Input
03
Metadata
SCHEMA: 5.2
Published
2026-08-20 21:57Z
1 DAY AGO
Last updated
2026-08-21 11:20Z
14 HR AGO
Reserved
2026-08-10
Assigning CNA
VulnCheck
Record state
PUBLISHED
Severity
High (CVSS 8.7)
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weaknesses
CWE-1333
Inefficient Regular Expression Complexity
Base
SSVC decision
Exploitation
poc
Automatable
yes
Technical Impact
partial
Data version
5.2
Document digest
982b7446fc5ec8233f7f7b128a7d940506d465a51e871f88a095d060632f0489
04
Affected products
PAIRS: 1
Vendor
Product
Versions
Platforms
nltk
nltk
0 to < 3.10.1
—
05
References
REFS: 5
github.com
GitHub Issue #3704
https://github.com/nltk/nltk/issues/3704
issue-tracking
github.com
Unbounded naked-domain branch in the URLS pattern at 3.9.4
https://github.com/nltk/nltk/blob/3.9.4/nltk/tokenize/casual.py
technical-description
github.com
NLTK v3.10.1 Release Notes
https://github.com/nltk/nltk/releases/tag/v3.10.1
release-notes
github.com
https://github.com/nltk/nltk
product
www.vulncheck.com
VulnCheck Advisory: NLTK TweetTokenizer URL Pattern Backtracks Catastrophically on Naked-Domain-Like Input
https://www.vulncheck.com/advisories/nltk-tweettokenizer-url-pattern-backtracks-catastrophically-on-naked-domain-like-input
third-party-advisory