[UPDATE] [medium] HAProxy Enterprise, Community and ALOHA (QUIC): Multiple vulnerabilities allow Denial of Service
A remote, anonymous attacker can exploit multiple vulnerabilities in HAProxy Enterprise, Community and ALOHA to conduct a Denial of Service attack.
CSIRTS triage
- What
- Multiple vulnerabilities allow Denial of Service.
- Who is affected
- A remote, anonymous attacker can exploit these vulnerabilities in HAProxy.
- Urgency
- Remediation is medium urgency as it can lead to service disruption.
- Action
- Update HAProxy to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch HAProxy Enterprise, Community and ALOHA (QUIC)
Get an email when a new HAProxy Enterprise, Community and ALOHA (QUIC) advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0410
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-260800.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all scored CVEs.
- Low exploitation riskCVE-2026-260810.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-26080 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-26081 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- mediumCVE-2026-26081: HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN …nvd
- lowCVE-2026-26080: HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because v…nvd
- mediumCVE-2026-26081: HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN …msrc
- lowCVE-2026-26080: HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because v…msrc
Recent advisories for HAProxy Enterprise
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCVE-2026-26081: HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN …nvd · 2026-07-20
- lowCVE-2026-26080: HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because v…nvd · 2026-07-20
- mediumCVE-2026-26081: HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN …msrc · 2026-07-14
- lowCVE-2026-26080: HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because v…msrc · 2026-07-14
More from CERT-Bund (BSI) Security Advisories
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-31
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow Denial of Service2026-07-31
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities2026-07-31
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-31
- medium[UPDATE] [medium] Linux Kernel (ntfs3): Vulnerability allows information disclosure2026-07-31