DEBIAN-CVE-2026-55204

See a problem?
Please try reporting it to the source first.
Source
https://security-tracker.debian.org/tracker/CVE-2026-55204
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55204.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-55204
Upstream
Published
2026-06-18T17:16:34Z
Modified
2026-09-14T17:03:43Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpack_dht_insert() within src/hpack-tbl.c that fails to validate the return value of hpack_dht_defrag() when the memory pool is exhausted. An attacker can trigger HPACK dynamic table insertions under memory pressure to dereference a NULL pointer and crash HAProxy worker processes, causing denial of service.

References

Affected packages

Debian:12 / haproxy

Package

Name
haproxy
Purl
pkg:deb/debian/haproxy?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.6.12-1
2.6.12-1+deb12u1
2.6.12-1+deb12u2
2.6.12-1+deb12u3
2.6.13-1
2.6.14-1
2.6.15-1
2.7.0-1
2.7.1-1
2.7.2-1
2.7.2-2
2.7.3-1
2.7.4-1
2.7.5-1
2.7.6-1
2.7.7-1
2.7.8-1
2.8.0-1
2.8.1-1
2.8.2-1
2.8.3-1
2.8.4-1
2.8.4-2
2.8.5-1
2.9.0-1
2.9.1-1
2.9.2-1
2.9.3-1
2.9.4-1
2.9.5-1
2.9.6-1
2.9.7-1
2.9.8-1
2.9.9-1
2.9.10-1
2.9.11-1
2.9.12-1
3.*
3.0.0-1
3.0.1-1
3.0.2-1
3.0.3-1
3.0.4-1
3.0.5-1
3.0.6-1
3.0.6-2
3.0.6-3
3.0.7-1
3.0.8-1
3.0.9-1
3.0.10-1
3.0.11-1
3.1.0-1
3.1.0-2
3.1.1-1
3.1.2-1
3.1.3-1
3.1.5-1
3.1.6-1
3.1.7-1
3.2.0-1
3.2.1-1
3.2.3-1
3.2.3-2
3.2.4-1
3.2.5-1
3.2.5-2
3.2.6-1
3.2.7-1
3.2.8-1
3.2.9-1
3.2.10-1
3.2.11-1
3.2.11-2
3.2.12-1
3.2.13-1
3.2.14-1
3.2.15-1
3.2.16-1
3.2.17-1
3.2.18-1
3.2.19-1
3.2.20-1
3.2.21-1
3.2.22-1
3.2.23-1
3.3.0-1
3.3.1-1
3.3.2-1
3.3.2-2
3.3.3-1
3.3.4-1
3.3.5-1
3.3.6-1
3.3.7-1
3.3.8-1
3.3.9-1
3.3.10-1
3.4.0-1
3.4.1-1
3.4.2-1
3.4.3-1
3.4.4-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55204.json"

Debian:13 / haproxy

Package

Name
haproxy
Purl
pkg:deb/debian/haproxy?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.11-1
3.0.11-1+deb13u1
3.0.11-1+deb13u2
3.0.11-1+deb13u3
3.1.0-1
3.1.0-2
3.1.1-1
3.1.2-1
3.1.3-1
3.1.5-1
3.1.6-1
3.1.7-1
3.2.0-1
3.2.1-1
3.2.3-1
3.2.3-2
3.2.4-1
3.2.5-1
3.2.5-2
3.2.6-1
3.2.7-1
3.2.8-1
3.2.9-1
3.2.10-1
3.2.11-1
3.2.11-2
3.2.12-1
3.2.13-1
3.2.14-1
3.2.15-1
3.2.16-1
3.2.17-1
3.2.18-1
3.2.19-1
3.2.20-1
3.2.21-1
3.2.22-1
3.2.23-1
3.3.0-1
3.3.1-1
3.3.2-1
3.3.2-2
3.3.3-1
3.3.4-1
3.3.5-1
3.3.6-1
3.3.7-1
3.3.8-1
3.3.9-1
3.3.10-1
3.4.0-1
3.4.1-1
3.4.2-1
3.4.3-1
3.4.4-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55204.json"

Debian:14 / haproxy

Package

Name
haproxy
Purl
pkg:deb/debian/haproxy?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.2.20-1

Affected versions

3.*
3.0.11-1
3.1.0-1
3.1.0-2
3.1.1-1
3.1.2-1
3.1.3-1
3.1.5-1
3.1.6-1
3.1.7-1
3.2.0-1
3.2.1-1
3.2.3-1
3.2.3-2
3.2.4-1
3.2.5-1
3.2.5-2
3.2.6-1
3.2.7-1
3.2.8-1
3.2.9-1
3.2.10-1
3.2.11-1
3.2.11-2
3.2.12-1
3.2.13-1
3.2.14-1
3.2.15-1
3.2.16-1
3.2.17-1
3.2.18-1
3.2.19-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55204.json"