CVE-2026-44235

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

September 17, 2026

Last Modified

September 17, 2026

Advisory Details (4)

Auto-updated Sep 17, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

rabbitmq-c v0.16.0

Patch available: alanxz/rabbitmq-c v0.16.0

https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0
github_commit Patch Available

commit 1d3afbb056fe (alanxz/rabbitmq-c)

Patch available: alanxz/rabbitmq-c v0.16.0 (contains commit 1d3afbb056fe)

https://github.com/alanxz/rabbitmq-c/commit/1d3afbb056fee5cc9ea05680bf32288715d0d802
github_pr Patch Available

amqp_connection: reject undersized frames in amqp_handle_input (GHSA-9mmv-r8g3-qp46)

Patch available: alanxz/rabbitmq-c v0.16.0 (PR #878 merged 2026-06-08)

https://github.com/alanxz/rabbitmq-c/pull/878
github Patch Available🟡 PoC Available

size_t underflow in AMQP frame length computation leads to out-of-bounds read in rabbitmq-c · Advisory · alanxz/rabbitmq-c · GitHub

https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-9mmv-r8g3-qp46

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibrabbitmq4 (0.15.0-1ubuntu0.26.04.1) @ resolute2026-09-19ubuntu
ubuntulibrabbitmq4 (0.10.0-1ubuntu2.2) @ jammy2026-09-19ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 19:10 UTCEG score recompute
  2. 2026-09-19 19:10 UTCVendor advisory
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 18:47 UTCVendor advisory
  5. 2026-09-17 18:26 UTCEG score recompute
  6. 2026-09-17 18:26 UTCVendor advisory
  7. 2026-09-17 17:20 UTCEG score recompute
  8. 2026-09-17 17:19 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-44235?
CVE-2026-44235 is a medium vulnerability published on September 17, 2026. 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 sizet underflow in amqphandleinput() in librabbitmq/amqpconnection.c. The parser subtracts HEADERSIZE, fixed…
When was CVE-2026-44235 disclosed?
CVE-2026-44235 was first published in the National Vulnerability Database on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44235 actively exploited?
CVE-2026-44235 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.2% of all scored CVEs.
What is the CVSS score of CVE-2026-44235?
CVE-2026-44235 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-44235?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44235, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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