Bug 2491589 (CVE-2026-12246) - CVE-2026-12246 nsd: Out of bounds stack write with crafted APL RR
Summary: CVE-2026-12246 nsd: Out of bounds stack write with crafted APL RR
Keywords:
Status: NEW
Alias: CVE-2026-12246
Deadline: 2026-06-25
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2494183 2494184
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-22 23:44 UTC by OSIDB Bzimport
Modified: 2026-06-29 13:48 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-06-22 23:44:12 UTC 
NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes.

Even though the data is from a configured primary inside NSD's trust boundary, we do consider the risk significant enough for multi-tenant secondary DNS deployments, where a primary could introduce the rogue APL with the secondary not noticing or only after the fact.
Note You need to log in before you can comment on or make changes to this bug.