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CVE-2025-53537

LibHTP's memory leak with lzma can lead to resource starvation

7.5 HighFix available

LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled to false. This issue is fixed in version 0.5.51.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.50%Up 0.5 points since Jul 24, 2025
90%50%10%1%

What each source reports

CVE List Score used 7.5

LibHTP's memory leak with lzma can lead to resource starvation

LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled to false. This issue is fixed in version 0.5.51.

Record
CVE-2025-53537
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-401
Updated
2026-11-02
EUVDEUVD-2025-22472 7.5

LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled to false. This issue is fixed in version 0.5.51.

Record
EUVD-2025-22472
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
NVD 7.5

LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled to false. This issue is fixed in version 0.5.51.

Record
CVE-2025-53537
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-401
Updated
2026-11-02
OSV 7.5

LibHTP's memory leak with lzma can lead to resource starvation

LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled to false. This issue is fixed in version 0.5.51.

Record
CVE-2025-53537
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-401
Updated
2026-11-02
OSVDEBIAN-CVE-2025-53537 7.5

LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled to false. This issue is fixed in version 0.5.51.

Record
DEBIAN-CVE-2025-53537
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2025-53537 7.5

LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled to false. This issue is fixed in version 0.5.51.

Record
UBUNTU-CVE-2025-53537
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUSN-7814-1 No score

libhtp vulnerabilities

It was discovered that LibHTP did not correctly handle certain HTTP headers. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2024-23837)

It was discovered that LibHTP did not correctly parse certain HTTP requests. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2024-28871)

It was discovered that LibHTP did not correctly parse certain HTTP requests. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2024-45797)

It was discovered that LibHTP did not correctly handle certain memory operations. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 25.04. (CVE-2025-53537)

Record
USN-7814-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libhtp
Debian:13
 before 1:0.5.50-1+deb13u1, plus listed versions
1:0.5.50-11:0.5.50-1+deb13u1~bpo12+1
1:0.5.50-1+deb13u1
libhtp
Ubuntu:Pro:16.04:LTS
 before 0.5.15-1ubuntu0.1~esm1, plus listed versions
0.5.15-1
0.5.15-1ubuntu0.1~esm1
libhtp
Ubuntu:Pro:18.04:LTS
 before 1:0.5.26-1ubuntu0.1~esm1, plus listed versions
1:0.5.25-11:0.5.26-1
1:0.5.26-1ubuntu0.1~esm1
libhtp
Ubuntu:Pro:20.04:LTS
 before 1:0.5.32-1ubuntu0.1~esm1, plus listed versions
1:0.5.30-11:0.5.31-11:0.5.32-1
1:0.5.32-1ubuntu0.1~esm1
libhtp
Ubuntu:Pro:22.04:LTS
 before 1:0.5.39-1ubuntu0.1~esm1, plus listed versions
1:0.5.36-11:0.5.38-11:0.5.39-1
1:0.5.39-1ubuntu0.1~esm1
libhtp
Ubuntu:Pro:24.04:LTS
 before 1:0.5.46-1ubuntu2+esm1, plus listed versions
1:0.5.45-11:0.5.46-1ubuntu11:0.5.46-1ubuntu2
1:0.5.46-1ubuntu2+esm1
libhtp
Ubuntu:25.10
 All versions, plus listed versions
1:0.5.49-11:0.5.50-1
 None known
libhtp
Ubuntu:26.04:LTS
 All versions, plus listed versions
1:0.5.50-11:0.5.52-11:0.5.52-2
 None known
libhtp
Ubuntu:Pro:16.04:LTS
From an advisory covering 4 CVEs
 before 0.5.15-1ubuntu0.1~esm1, plus listed versions
0.5.15-1
0.5.15-1ubuntu0.1~esm1
libhtp
Ubuntu:Pro:18.04:LTS
From an advisory covering 4 CVEs
 before 1:0.5.26-1ubuntu0.1~esm1, plus listed versions
1:0.5.25-11:0.5.26-1
1:0.5.26-1ubuntu0.1~esm1
libhtp
Ubuntu:Pro:20.04:LTS
From an advisory covering 4 CVEs
 before 1:0.5.32-1ubuntu0.1~esm1, plus listed versions
1:0.5.30-11:0.5.31-11:0.5.32-1
1:0.5.32-1ubuntu0.1~esm1
libhtp
Ubuntu:Pro:22.04:LTS
From an advisory covering 4 CVEs
 before 1:0.5.39-1ubuntu0.1~esm1, plus listed versions
1:0.5.36-11:0.5.38-11:0.5.39-1
1:0.5.39-1ubuntu0.1~esm1
libhtp
Ubuntu:Pro:24.04:LTS
From an advisory covering 4 CVEs
 before 1:0.5.46-1ubuntu2+esm1, plus listed versions
1:0.5.45-11:0.5.46-1ubuntu11:0.5.46-1ubuntu2
1:0.5.46-1ubuntu2+esm1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-53537 is a high vulnerability (CVSS 7.5) in Oisf Libhtp, published July 23, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.50%, the 43rd percentile. Fixed in libhtp 1:0.5.50-1+deb13u1.

References

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