Vulnerability · CVE-2026-115506
expat: Schwachstelle ermöglicht Denial of Service
Published Oct 22, 2026 · catalog updated Oct 23, 2026 · expat: Schwachstelle ermöglicht Denial
Last checked Oct 25, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-115506. EPSS is 0.46%. Act only if a listed version of expat: Schwachstelle ermöglicht Denial is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (expat: Schwachstelle ermöglicht Denial).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-41080 · Low
- CVE-2026-32778 · Medium
- CVE-2026-32777 · Medium
- CVE-2026-32776 · Medium
- CVE-2025-59375 · High
- Severity
- High8.7
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.46%
- Remediation
- Advisory link
- Affected products
- vendor libexpat libexpat
libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor libexpat libexpatversion unspecified
How to fix CVE-2026-115506
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
No version range is stored, so an installed version cannot be checked on this page.
Advisory
Open the bsi record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-115506. EPSS is 0.46%. Act only if a listed version of expat: Schwachstelle ermöglicht Denial is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-776. EPSS 0.46%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 23, 2026 · BSI CERT-Bund
Detected
expat: Schwachstelle ermöglicht Denial of Service
Oct 23, 2026 · CVE.org
Updated
libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.
Sources
- BSI CERT-BundGovernment advisoryCVE-2026-115506
expat: Schwachstelle ermöglicht Denial of Service
wid.cert-bund.de - CVE.orgVulnerability recordCVE-2026-115506
libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions
cve.org - FIRST EPSSExploitation probabilityCVE-2026-115506
30-day exploitation probability 0.46%
first.org
References
Freshness
Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSOct 25, 2026
- CVE.orgOct 24, 2026
- BSI CERT-BundOct 23, 2026