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CVE-2026-59928 Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions

🗓️ 08 Jul 2026 16:23:21Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 65 Views

Mistune block_parser causes quadratic parsing on long reference definitions, enabling denial of service; fixed in version three.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-59928
8 Jul 202616:23
–attackerkb
cbl_mariner
CBLMariner
CVE-2026-59928 affecting package python-mistune for versions less than 3.3.0-1
1 Jul 202602:06
–cbl_mariner
circl
Circl
CVE-2026-59928
8 Jul 202619:26
–circl
cve
CVE
CVE-2026-59928
8 Jul 202616:23
–cve
debiancve
Debian CVE
CVE-2026-59928
8 Jul 202616:23
–debiancve
euvd
EUVD
EUVD-2026-42338
20 Jul 202621:24
–euvd
github
Github Security Blog
Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions
20 Jul 202621:24
–github
mend
Mend
CVE-2026-59928
8 Jul 202616:23
–mend
nvd
NVD
CVE-2026-59928
8 Jul 202617:17
–nvd
nessus
Tenable Nessus
openSUSE 16 Security Update : python-mistune (openSUSE-SU-2026:21339-1)
16 Jul 202600:00
–nessus
Rows per page
[
  {
    "vendor": "lepture",
    "product": "mistune",
    "versions": [
      {
        "version": "< 3.3.0",
        "status": "affected"
      }
    ]
  }
]

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