CVE-2026-12244

unknown

Published 2026-06-25 · Modified 2026-06-25

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CVSS v3

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CVSS v4 NEW

8.7

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

VIR risk

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Description

If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size > 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Ubuntu Fixed 6 releases

Version	Status	Fixed in
xenial	Fixed	`4.1.7-1ubuntu0.1~esm1`
resolute	Fixed	`4.14.0-1ubuntu0.1~esm1`
noble	Fixed	`4.8.0-1ubuntu0.1~esm1`
jammy	Fixed	`4.3.9-1ubuntu0.1~esm1`
focal	Fixed	`4.1.26-1ubuntu0.1~esm1`
bionic	Fixed	`4.1.17-1ubuntu0.1~esm1`

References

CWEs

CWE-122 CWE-190

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.