CVE-2026-23556Disclosure

LOWCVSS 9.4 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

When oxenstored is tearing a domain down, the node data is cleaned up but the usage counts are leaked. When the domain ID is eventually reused, the new domain can create fewer nodes before beeing deemed to be over quota.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-281

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets2 URLs

By indicator

Full discourse1 post

Open Source Security mailing list@oss_security163d
Disclosure
6 Xen Security Advisories 483 v2 (CVE-2026-23556): oxenstored keeps quota related use counts across domain destruction https://www.openwall.com/lists/oss-security/2026/04/28/10 484 v2 (CVE-2026-23557): Xenstored DoS via XS_RESET_WATCHES command https://www.openwall.com/lists/oss-security/2026/04/28/11 1/3
Post summary
Two Xen Security Advisories have been published, revealing a quota counting mishandling and a DoS via XS_RESET_WATCHES; no exploit evidence, patch, or active exploitation are mentioned.
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