Is there a public exploit for CVE-2026-126297?

No public exploit for CVE-2026-126297 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-126297?

CVE-2026-126297 scores CVSS 8.7 (v4.0), rated high.

What does CVE-2026-126297 affect?

CVE-2026-126297 affects nltk nltk.

8.7 High

NLTK before 3.10.4 contains a quadratic-time denial of service vulnerability in ConllCorpusReader.getsrlinstances that allows remote…

CVE-2026-126297

NLTK before 3.10.4 contains a quadratic-time denial of service vulnerability in ConllCorpusReader.getsrlinstances that allows remote attackers to exhaust CPU through nested span rescans. Attackers can supply a crafted CoNLL SRL corpus with many predicates and span columns, placing the head span last, to pin a core for minutes.

Assessment

CVSS: 8.7 (v4.0)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 November 2026
Last updated: 13 November 2026
Affected: nltk · nltk
Assigner: VulnCheck

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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