CVE catalog

CVE-2025-46728

cpp-httplib: CVE-2025-46728

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: May 6, 2025, 12:45:25 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.66% · Oct 25, 2026

cpp-httplib is a C++ header-only HTTP/HTTPS server and client library. Prior to version 0.20.1, the library fails to enforce configured size limits on incoming request bodies when `Transfer-Encoding: chunked` is used or when no `Content-Length` header is provided. A remote attacker can send a chunked request without the terminating zero-length chunk, causing uncontrolled memory allocation on the server. This leads to potential exhaustion of system memory and results in a server crash or unresponsiveness. Version 0.20.1 fixes the issue by enforcing limits during parsing. If the limit is exceeded at any point during reading, the connection is terminated immediately. A short-term workaround through a Reverse Proxy is available. If updating the library immediately is not feasible, deploy a reverse proxy (e.g., Nginx, HAProxy) in front of the `cpp-httplib` application. Configure the proxy to enforce maximum request body size limits, thereby stopping excessively large requests before they reach the vulnerable library code.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	cpp-httplib	sid	`0.41.0+ds-3`	fixed
Debian	cpp-httplib	forky	`0.41.0+ds-3`	fixed
Debian	cpp-httplib	trixie	`0.18.7-1+deb13u1`	fixed
Debian	cpp-httplib	trixie-security	`0.18.7-1+deb13u1`	fixed
Debian	cpp-httplib	bookworm	`0.11.4+ds-1+deb12u1`	vulnerable
Ubuntu	cpp-httplib	pro	`0.18.7-1`	vulnerable
Ubuntu	cpp-httplib	pro	`0.26.0+ds-2ubuntu2`	vulnerable
Ubuntu	cpp-httplib	pro	`0.26.0+ds-2ubuntu3`	vulnerable
Ubuntu	cpp-httplib	pro	`0.26.0+ds-2ubuntu3+esm1`	vulnerable
Ubuntu	cpp-httplib	25.10	`0.18.7-1`	vulnerable
Ubuntu	cpp-httplib	25.10	`0.18.7-1ubuntu0.25.10.1`	vulnerable
Ubuntu	cpp-httplib	25.10	`0.18.7-1ubuntu0.25.10.2`	vulnerable
Opensuse	cpp-httplib	tumbleweed	`0.20.1-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	cpp-httplib	source	sid	`0.25.0+ds-3`	not yet assigned	Not reported	[1104926]
Debian	cpp-httplib	source	forky	`0.25.0+ds-3`	not yet assigned	Not reported	[1104926]
Debian	cpp-httplib	source	trixie	`0.18.7-1+deb13u1`	not yet assigned	Not reported	[1104926]
Debian	cpp-httplib	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1104926]
Opensuse	cpp-httplib	rpm	tumbleweed	`0.20.1-1.1`	Not reported	OPENSUSE-SU-2025:15084-1	Not reported

[Debian bug #1104926]

Notes

[bookworm] cpp-httplib: Minor issue, DoS

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libcpp-httplib0.11]Affected
Source package: [cpp-httplib]
Details (2)
- 0.11.4+ds-1+deb12u1 · amd64 · bookworm
  Affected
  dsa · cpp-httplib · debian · bookworm; dsa · cpp-httplib · debian · 12
- 0.11.4+ds-1+deb12u1 · arm64 · bookworm
  Affected
  dsa · cpp-httplib · debian · bookworm; dsa · cpp-httplib · debian · 12
[libcpp-httplib-dev]Affected
Source package: [cpp-httplib]
Details (2)
- 0.11.4+ds-1+deb12u1 · amd64 · bookworm
  Affected
  dsa · cpp-httplib · debian · bookworm; dsa · cpp-httplib · debian · 12
- 0.11.4+ds-1+deb12u1 · arm64 · bookworm
  Affected
  dsa · cpp-httplib · debian · bookworm; dsa · cpp-httplib · debian · 12

[openSUSE Tumbleweed]

[cpp-httplib-devel]Unknown
Source package: [cpp-httplib]
Details (1)
- 0.49.0-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 0.20.1-1.1
  Version impact unknown
  dsa · cpp-httplib · opensuse · tumbleweed
[libcpp-httplib0_49]Unknown
Source package: [cpp-httplib]
Details (1)
- 0.49.0-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 0.20.1-1.1
  Version impact unknown
  dsa · cpp-httplib · opensuse · tumbleweed

[Debian 13 (Trixie)]

[libcpp-httplib0.18]Fixed
Source package: [cpp-httplib]
Details (4)
- 0.18.7-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
- 0.18.7-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
- 0.18.7-1+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
- 0.18.7-1+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
[libcpp-httplib0.41]Fixed
Source package: [cpp-httplib]
Details (2)
- 0.41.0+ds-3~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
- 0.41.0+ds-3~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
[libcpp-httplib-dev]Fixed
Source package: [cpp-httplib]
Details (6)
- 0.18.7-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
- 0.18.7-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
- 0.41.0+ds-3~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
- 0.41.0+ds-3~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
- 0.18.7-1+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13
- 0.18.7-1+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 0.18.7-1+deb13u1
  dsa · cpp-httplib · debian · 13

Observed: Oct 27, 2026, 2:20:22 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]