Vulnerability · CVE-2026-110353
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame.
Published Oct 22, 2026 · catalog updated Oct 24, 2026 · Red Hat Red Hat Enterprise Linux
Last checked Oct 31, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-110353. EPSS is 0.74%. 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
- CVE-2026-120210 · Medium
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- CVE-2026-119341 · Medium
- CVE-2026-119340 · Medium
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.74%
- Remediation
- Advisory link
- Affected products
- Debian:12 haproxy · Debian:13 haproxy · Debian:14 haproxy · redhat haproxy-main-3.0.30-0.1.hum1
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that pending data without making progress. The CPU spins until timeout http-request closes the connection, and an attacker opening many such connections can sustain high CPU usage.
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 haproxy2.6.12-1, 2.6.12-1+deb12u1, 2.6.12-1+deb12u2
- Debian:13 haproxy3.0.11-1, 3.0.11-1+deb13u1, 3.0.11-1+deb13u2
- Debian:14 haproxy0 → 3.2.26-1
- redhat haproxy-main-3.0.30-0.1.hum1version unspecified
How to fix CVE-2026-110353
Upgrade
CVE-2026-110353 lists a fix boundary at 3.2.26-1. Compare the installed build with that boundary before you change production.
Version check
Fixed in 3.2.26-1 · 6 other ranges on the advisory
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-2026-110353. EPSS is 0.74%. 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 2.6.12-1, 2.6.12-1+deb12u1, 2.6.12-1+deb12u2, 3.0.11-1, 3.0.11-1+deb13u1, 3.0.11-1+deb13u2, 0 → 3.2.26-1. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-252: Unchecked Return Value; CWE-835: Infinite Loop. EPSS 0.74%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
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.
Oct 22, 2026 · NIST NVD
Detected
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that p
Oct 24, 2026 · Trivy Vulnerability DB
Fix available
haproxy fixed in 3.2.26-1
Oct 24, 2026 · Trivy Vulnerability DB
Fix available
haproxy fixed in 3.2.26-1
Oct 24, 2026 · Trivy Vulnerability DB
Updated
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that p
Sources
- BSI CERT-BundGovernment advisoryCVE-2026-110353
HAProxy: Mehrere Schwachstellen ermöglichen Denial of Service
wid.cert-bund.de - CVE.orgVulnerability recordCVE-2026-110353
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-110353
30-day exploitation probability 0.74%
first.org - NIST NVDVulnerability recordCVE-2026-110353
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomp
nvd.nist.gov - Red Hat Security DataVendor advisoryCVE-2026-110353
haproxy: HAProxy: Denial of Service via truncated HTTP/2 PING frame
access.redhat.com - Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-110353
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomp
osv.dev
References
Freshness
Last verified in this catalog Oct 31, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSOct 31, 2026
- BSI CERT-BundOct 28, 2026
- Trivy Vulnerability DBOct 24, 2026
- Red Hat Security DataOct 23, 2026
- CVE.orgOct 22, 2026
- NIST NVDOct 22, 2026