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CVE-2026-44453 h2o is vulnerable to musl libc stack overflow

🗓️ 16 Jul 2026 23:04:41Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 9 Views

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 6b5370d, h2o is vulnerable to a Denial of Service attack when calling alloca under certain conditions. When serving static files, h2o builds the file path on stack...

Related
Affected
Refs
ReporterTitlePublishedViews
Family
freebsd
h2o -- stack overflow serving static files on musl libc
29 May 202600:00
freebsd
attackerkb
CVE-2026-44453
16 Jul 202623:04
attackerkb
circl
CVE-2026-44453
17 Jul 202600:39
circl
cve
CVE-2026-44453
16 Jul 202623:04
cve
euvd
EUVD-2026-45074
16 Jul 202623:04
euvd
nessus
FreeBSD : h2o -- stack overflow serving static files on musl libc (644d5e6c-1bd9-4904-8440-16c04100a2e1)
12 Jun 202600:00
nessus
nvd
CVE-2026-44453
16 Jul 202623:16
nvd
ptsecurity
PT-2026-60604
16 Jul 202600:00
ptsecurity
[
  {
    "vendor": "h2o",
    "product": "h2o",
    "versions": [
      {
        "version": "< 6b5370d",
        "status": "affected"
      }
    ]
  }
]

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16 Jul 2026 23:04Current
CVSS 3.17.5
EPSS0.00052
9