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Vulnerabilities

Vulnerability · CVE-2026-26080

HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because varint is mishandled.

Published Jul 20, 2026 · catalog updated Aug 25, 2026 · HAProxy Community Edition 3.2.x

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-26080. EPSS is 0.55%. Act only if a listed version of HAProxy Community Edition 3.2.x is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (HAProxy Community Edition 3.2.x).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Low3.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.55%
Remediation
Version ranges on file
Affected products
cpe haproxy/aloha · cpe haproxy/haproxy · cpe haproxy/haproxy enterprise

HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because varint is mishandled. HAProxy Enterprise and ALOHA are also affected.

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.

  • cpe haproxy/aloha< 17.0.18
  • cpe haproxy/aloha< 17.5.16
  • cpe haproxy/haproxy< 3.2.12
  • cpe haproxy/haproxy< 3.3.3
  • cpe haproxy/haproxy enterprise3.2r1

How to fix CVE-2026-26080

  • Upgrade

    CVE-2026-26080 lists a fix boundary at 17.0.18. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 17.0.18

  • Advisory

    Open the inventory_high 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-2026-26080. EPSS is 0.55%. Act only if a listed version of HAProxy Community Edition 3.2.x is installed.

Which versions are affected?

Compare what you have installed with haproxy/haproxy enterprise 3.2r1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-252: Unchecked Return Value. EPSS 0.55%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

HAProxy 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. Jul 20, 2026 · Monitored products — high

    Detected

    HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because varint is mishandled. HAProxy Enterprise and ALOHA are also affected.

  2. Aug 25, 2026 · Monitored products — high

    Updated

    HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because varint is mishandled. HAProxy Enterprise and ALOHA are also affected.

Sources

  • Monitored products — highVendor advisoryCVE-2026-26080

    HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because varint is mishandled. HAProxy Enterprise and ALOHA are also affected.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — highNov 2, 2026