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CVE-2026-115506ImportantNetworkRevised 26 Oct

libexpat through 2.9.0 Denial of Service via Billion Laughs Detection Delay

MSRC advisory NVD CVE.org

Assessment

Severity
Important
CVSS base score
7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact
Not stated
EPSS, next 30 days
Not scored yet
Public exploit code
No Nuclei template lists it
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Required: apply the update
Component
Mariner
Weakness
CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
Issued by
VulnCheck
Published
24 Oct 2026 · October 2026
Last revised
26 Oct 2026Information published.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
NoneC:N
Integrity
NoneI:N
Availability
HighA:H

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

2 affected products
  • azl3 cmake 3.30.3-15 on Azure Linux 3.0
  • azl3 expat 2.8.3-2 on Azure Linux 3.0

What changed

First observed 24 Oct 2026
  1. 26 Oct 2026 · 07:26:10 UTC Last revised25 Oct 2026 01:01 UTC → 26 Oct 2026 01:48 UTC
  2. 26 Oct 2026 · 07:26:10 UTC Affected productsazl3 expat 2.8.3-2 on Azure Linux 3.0 → azl3 cmake 3.30.3-15 on Azure Linux 3.0, azl3 expat 2.8.3-2 on Azure Linux 3.0
  3. 25 Oct 2026 · 07:41:18 UTC Last revised24 Oct 2026 01:01 UTC → 25 Oct 2026 01:01 UTC

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Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

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Explore global source statements, affected packages and advisory history for CVE-2026-115506. The catalog has a separate collection scope from Microsoft release records.

Explicit identifiers and source references

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-115506 · Microsoft / collected KEV context

cve-program · CVE-2026-115506

Related operational evidence

Explicit CVE identifiers

No related operational record is retained in the current change model.

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 26 Oct 16:45 UTC · 272 of 272 readable · 271 fully read · documentation 469/469 current

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