Improper Validation of Specified Quantity in Input in Erlang OTP - CVE-2026-71562
Published: September 2, 2026
Vulnerability identifier: #VU146833
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-71562
CWE-ID: CWE-1284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper validation of specified quantity in input in the httpc Content-Length handling in httpc_handler.erl when parsing a server-supplied Content-Length header. A remote attacker can supply a specially crafted Content-Length value to cause a denial of service.
The issue occurs because the Content-Length value is parsed before the size check, and the default max_header_size setting is nolimit.
Affected software
Erlang OTP
How to mitigate CVE-2026-71562
Install security update from vendor's website.
Erlang OTP - addressed in versions 17.0, 27.3.4.17, 28.5.0.6, 29.0.6