Vulnerability · Published Oct 28, 2026 · Assigned by CPANSec
CVE-2026-116531HTTP::Body versions before 1.23_01 for Perl lose track of chunk boundaries in chunked request bodies when a read ends inside a chunk
Critical 9.1
In plain English
A critical-severity security flaw in HTTP-Body. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
HTTP::Body versions before 1.23_01 for Perl lose track of chunk boundaries in chunked request bodies when a read ends inside a chunk. In chunked mode, used when no content length is given, add() treats a chunk as complete once the buffer is as long as the chunk's declared size, but the buffer still holds the chunk-size line. When a read ends in the last bytes of a chunk, add() takes the chunk short and parses the leftover data as the next chunk-size line. A remote attacker can make a chunked body never complete, hanging a server that reads until the body is done, and may make it complete early, leaving the remaining bytes to be read as the next request.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libhttp-body-perl | no fix listed | DEBIAN-CVE-2026-116531 |
| Debian:13 | libhttp-body-perl | no fix listed | DEBIAN-CVE-2026-116531 |
| Debian:14 | libhttp-body-perl | 1.24.01-1 | DEBIAN-CVE-2026-116531 |
| Ubuntu:22.04:LTS | libhttp-body-perl | no fix listed | UBUNTU-CVE-2026-116531 |
| Ubuntu:24.04:LTS | libhttp-body-perl | no fix listed | UBUNTU-CVE-2026-116531 |
| Ubuntu:26.04:LTS | libhttp-body-perl | no fix listed | UBUNTU-CVE-2026-116531 |
| Ubuntu:26.10 | libhttp-body-perl | no fix listed | UBUNTU-CVE-2026-116531 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| HTTP-Body | 0 – before 1.23_01 |
Weakness: CWE-130 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H