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CVE-2026-12876 is an uncontrolled resource consumption vulnerability in NLTK's RecursiveDescentParser and SteppingRecursiveDescentParser. Processing ambiguous or left-recursive context-free grammars can cause unbounded CPU consumption or Python recursion-stack exhaustion. An attacker who can supply a grammar or input to an affected parser can cause denial of service in the parsing process.
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No public exploit code observed for this vulnerability.
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2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability with an availability impact. The supplied CVSS vectors indicate low attack complexity and no required privileges or user interaction, with no confidentiality or integrity impact. The content does not identify the affected product or technical cause. Published September 2, 2026, with a patch publication date of September 3, 2026.
An uncontrolled resource-consumption denial-of-service vulnerability in NLTK RecursiveDescentParser and SteppingRecursiveDescentParser. Untrusted left-recursive or highly ambiguous grammars can trigger unbounded recursion or exponential parsing work from short inputs.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.