Search/CVE-2026-115349
● CVE — High

CVE-2026-115349

DiscoveredOct 22, 2026UpdatedOct 26, 2026

Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted requests.

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CVSS v3.1
7.5 HIGH
EPSS
0.34%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Oct 24, 2026 → Oct 26, 2026
● 0.00pp
0.34% → 0.34% over 2 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityNONE
IntegrityNONE
AvailabilityHIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Connections
1 relationships
Timeline
disclosure → media coverage
Oct 22, 2026
Disclosure — published as a CVE record. · last revised by NVD Oct 26, 2026