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Vulnerabilities

Vulnerability · CVE-2026-115449

A flaw was found in libslirp.

Published Oct 22, 2026 · catalog updated Oct 23, 2026 · Red Hat Red Hat Enterprise Linux

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-115449. EPSS is 0.24%. Act only if a listed version of Red Hat Red Hat Enterprise Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Low3.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.24%
Remediation
Advisory link
Affected products
Debian:12 libslirp · Debian:13 libslirp · Debian:14 libslirp

A flaw was found in libslirp. When handling ICMP echo requests, the reply length is not updated to match the actual data received from the host. Under specific conditions where the normal ICMP socket is unavailable, this length mismatch causes the host's real IP address to be leaked to the guest in the echo reply, breaking the NAT isolation that user-mode networking is expected to provide.

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.

  • Debian:12 libslirp4.7.0-1, 4.8.0-1, 4.9.1-1
  • Debian:13 libslirp4.8.0-1, 4.8.0-1+deb13u1, 4.9.1-1
  • Debian:14 libslirp4.8.0-1, 4.9.1-1, 4.9.2-1

How to fix CVE-2026-115449

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-2026-115449. EPSS is 0.24%. Act only if a listed version of Red Hat Red Hat Enterprise Linux is installed.

Which versions are affected?

Compare what you have installed with 4.7.0-1, 4.8.0-1, 4.9.1-1, 4.8.0-1, 4.8.0-1+deb13u1, 4.9.1-1, 4.8.0-1, 4.9.1-1, 4.9.2-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-200: Exposure of Sensitive Information. EPSS 0.24%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 22, 2026 · Red Hat Security Data

    Detected

    libslirp: libslirp: ICMP echo reply length desynchronization leaks host IP to guest

  2. Oct 23, 2026 · Trivy Vulnerability DB

    Updated

    A flaw was found in libslirp. When handling ICMP echo requests, the reply length is not updated to match the actual data received from the host. Under specific conditions where the normal ICMP socket is unavailable, this length mismatch causes the host's real IP address to be leaked to the guest in the echo reply, breaking the NAT isolation that user-mode networking is expected to provide.

Sources

  • CVE.orgVulnerability recordCVE-2026-115449

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-115449

    30-day exploitation probability 0.24%

    first.org
  • Red Hat Security DataVendor advisoryCVE-2026-115449

    libslirp: libslirp: ICMP echo reply length desynchronization leaks host IP to guest

    access.redhat.com
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-115449

    A flaw was found in libslirp. When handling ICMP echo requests, the reply length is not updated to match the actual data received from the host. Under specific conditions where the normal ICMP socket is unavailable, this length mismatch causes the host's real IP address to be lea

    osv.dev

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • Trivy Vulnerability DBOct 23, 2026
  • CVE.orgOct 23, 2026
  • Red Hat Security DataOct 23, 2026