Detections
Analytics

Fedora 43 : erlang-cowboy / erlang-cowlib (2026-ce97d80dae)

high Nessus Plugin ID 335329

Synopsis

The remote Fedora host is missing one or more security updates.

Description

The remote Fedora 43 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-ce97d80dae advisory.

 Coordinated security update of cowlib and cowboy, released together upstream on 2026-07-27.

 cowlib 2.19.0 fixes CVE-2026-59248: unbounded HPACK/QPACK prefixed-integer decoding allowed a denial of service. It also rejects empty HTTP/2 CONTINUATION frames and NUL bytes in multipart headers, validates cookie domain and path, limits cow_cookie:parse_cookie to 100 cookies by default, applies Sec-Websocket- Version limits to response headers, and enforces a custom max_concurrent_streams immediately.

 cowboy 2.18.0 is the matching release and requires cowlib 2.19.0. It rejects CR in HTTP/1.1 header values, rejects requests containing a fragment component, rejects HTTP/2 requests where host disagrees with :authority, adds a max_cookies option to the cowboy_req cookie functions, fixes max_headers handling with duplicate headers, and fixes the websocket max_inflate_size calculation.

 Note that cowboy 2.18.0 removes concurrent processing of pipelined HTTP/1.1 requests. Applications relying on that behaviour may see different throughput characteristics.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected erlang-cowboy and / or erlang-cowlib packages.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2026-ce97d80dae

Plugin Details

Severity: High

ID: 335329

File Name: fedora_2026-ce97d80dae.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/14/2026

Updated: 8/14/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.75

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-59248

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

Vector: 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

Vulnerability Information

CPE: cpe:/o:fedoraproject:fedora:43, p-cpe:/a:fedoraproject:fedora:erlang-cowboy, p-cpe:/a:fedoraproject:fedora:erlang-cowlib

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 8/5/2026

Vulnerability Publication Date: 7/28/2026

Reference Information

CVE: CVE-2026-59248