CVE-2026-59248: Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP

This month

HIGH 8.7REMOTE

CVE-2026-59248 is a high-severity flaw (CVSS 8.7) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP/2 or HTTP/3 peer to exhaust memory on the vulnerable server (or client) and cause a denial of service. The HPACK and QPACK prefixed-integer decoder cow_hpack_common:dec_big_int/3 in src/cow_hpack_common.hrl (invoked from cow_hpack:decode/2 in src/cow_hpack.erl and from cow_qpack:decode_field_section/3 in src/cow_qpack.erl) reads continu

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-07-28
Last modified	2026-10-24

Publisher (CNA): EEF

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-07-28 10:16 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

Exact fixes by distribution

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Ubuntu 20.04 · rabbitmq-server · FIXED · 3.8.3-0ubuntu0.3+esm1

sudo apt update && sudo apt install --only-upgrade rabbitmq-server dpkg --compare-versions "$(dpkg-query -W -f='${Version}' rabbitmq-server)" ge "3.8.3-0ubuntu0.3+esm1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · rabbitmq-server · FIXED · 3.9.27-0ubuntu0.5

sudo apt update && sudo apt install --only-upgrade rabbitmq-server dpkg --compare-versions "$(dpkg-query -W -f='${Version}' rabbitmq-server)" ge "3.9.27-0ubuntu0.5" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · rabbitmq-server · FIXED · 3.12.1-1ubuntu1.6

sudo apt update && sudo apt install --only-upgrade rabbitmq-server dpkg --compare-versions "$(dpkg-query -W -f='${Version}' rabbitmq-server)" ge "3.12.1-1ubuntu1.6" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · erlang-cowlib · NOT AFFECTED

Debian 13 · erlang-cowlib · NOT AFFECTED

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: cna.erlef.org/cves/CVE-2026-59248.html

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-59248?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-59248 being exploited?

CVE-2026-59248 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-59248 affect?

CVE-2026-59248 affects affected software. Severity is high (CVSS 8.7). Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP/2 or HTTP/3 peer to exhaust memory on the vulnerable server (or client) and cause a denial of service. The HPACK and QPACK prefi

How urgent is CVE-2026-59248?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

References

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