DEBIAN-CVE-2026-33630

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Source

https://security-tracker.debian.org/tracker/CVE-2026-33630

Import Source

https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33630.json

JSON Data

https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-33630

Upstream

CVE-2026-33630

Published

2026-09-03T19:17:27Z

Modified

2026-09-10T08:47:22Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

[none]

Details

c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-ares' query-completion handling. The same flaw — a query's callback being invoked while the query is still linked in the channel's internal lookup structures — is present at multiple points in the resend/finish path (timeout handling, response handling, and query dispatch). If the query, or for ares_getaddrinfo() the owning host_query, is freed as a side effect of that callback, it is then accessed and/or freed a second time. This vulnerability is fixed in ver 1.34.7.

References

https://security-tracker.debian.org/tracker/CVE-2026-33630

Affected packages

Debian:13 / c-ares

Package

Name: c-ares
Purl: pkg:deb/debian/c-ares?arch=source&distro=trixie

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.34.5-1

1.34.5-1+deb13u1

1.34.6-1

1.34.7-1

1.34.8-1

Ecosystem specific

{
    "urgency":  "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33630.json"

Debian:14 / c-ares