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Public proof of conceptFix available

CVE-2026-44235

A public proof of concept exists; no exploitation attested.

  • Published2026-09-17
  • Fixed in0.16.0
  • WeaknessCWE-125 · CWE-191

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

rabbitmq-c is a C-language AMQP client library for RabbitMQ. Prior to 0.16.0, a malicious AMQP server can send an undersized HEADER or METHOD frame during client login and cause unsigned size_t underflow in amqp_handle_input() in librabbitmq/amqp_connection.c. The parser subtracts HEADER_SIZE, fixed per-frame fields, and FOOTER_SIZE from state->target_size without first checking the minimum frame length. The wrapped encoded.len value is passed through amqp_decode_properties() to amqp_decode_table_internal(), where it defeats bounds checks and causes an out-of-bounds read and process crash. An on-path attacker can also trigger the issue when AMQP traffic is not protected by TLS with certificate validation. The demonstrated impact is denial of service, with no reliable memory disclosure or code execution shown. This issue is fixed in version 0.16.0.

Timeline

dates in UTC
  1. 2026-09-1718:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-44235?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-44235?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV
rabbitmq-c
BranchAffectedFixed in
0.16< 0.16.00.16.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-44235 Red Hat Product Security14 known affected

    rabbitmq-c: github.com/alanxz/rabbitmq-c: rabbitmq-c: Denial of Service via AMQP frame length underflow

    librabbitmq-devel as a component of Red Hat Enterprise Linux 10 · librabbitmq-tools as a component of Red Hat Enterprise Linux 10 · librabbitmq.src as a component of Red Hat Enterprise Linux 10 · +11 more

Full record on NVD

Fix

  1. Update rabbitmq-c to 0.16.0
  2. Workaround from the vendor Red Hat Product Security CVE-2026-44235 · 14 productsTo mitigate this issue, ensure that all AMQP client connections are configured to use TLS with certificate validation. This prevents on-path attackers from exploiting the vulnerability by ensuring the authenticity of the AMQP server and encrypting traffic. Proper certificate management and configur…
  3. No fix available, says the vendor Red Hat Product Security CVE-2026-44235 · 14 productsFix deferred

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionpoc2026-09-17
  • OpenCVESSVC decisionpoc—
  • CNACVSS 3.16.5read 2026-10-23
  • NVDweakness (CWE)CWE-125, CWE-191read 2026-10-23
  • FIRST EPSSEPSS score0.3 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published
2026-09-17
Last Modified
2026-09-30
NVD status
Awaiting Analysis

Frequently asked questions

What is CVE-2026-44235?

rabbitmq-c is a C-language AMQP client library for RabbitMQ. Prior to 0.16.0, a malicious AMQP server can send an undersized HEADER or METHOD frame during client login and cause unsigned size_t underflow in amqp_handle_input() in librabbitmq/amqp_connection.c. The parser subtracts HEADER_SIZE, fixed per-frame fields, and FOOTER_SIZE from state->target_size without first checking the minimum frame length. The wrapped encoded.len value is passed through amqp_decode_properties() to amqp_decode_table_internal(), where it defeats bounds checks and causes an out-of-bounds read and process crash. An on-path attacker can also trigger the issue when AMQP traffic is not protected by TLS with certificate validation. The demonstrated impact is denial of service, with no reliable memory disclosure or code execution shown. This issue is fixed in version 0.16.0.

Is CVE-2026-44235 actively exploited?

A proof-of-concept exploit exists for CVE-2026-44235, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-44235?

CVE-2026-44235 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

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