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Vulnerabilities

Vulnerability · AZL-90162

CVE-2026-43966 affecting package rabbitmq-server for versions less than 3.13.7-8

Published Jun 8, 2026 · catalog updated Nov 10, 2026 · affecting package rabbitmq-server for

Last checked Nov 11, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for AZL-90162. A missing EPSS score is not a low risk. Compare affecting package rabbitmq-server for with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (affecting package rabbitmq-server for).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Not established
Affected products
Azure Linux:3 rabbitmq-server

Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in ninenines cowlib allows HTTP response splitting via non-VCHAR bytes in structured-fields string values. cow_http_struct_hd:escape_string/2 in cowlib only escapes \ and ", passing all other bytes through verbatim. This creates an encoder/decoder asymmetry: the matching parser accepts only printable ASCII (0x20–0x7E, excluding " and \), but the encoder emits any byte including CR and LF. An application that builds a structured HTTP header via cow_http_struct_hd:item/1 (or a higher-level wrapper such as cow_http_hd:wt_protocol/1) from attacker-controlled input can have \r\n injected into the serialized header value. Once on the wire, the injected CRLF terminates the current header and any following bytes are interpreted as a new header, enabling HTTP response splitting. This issue affects cowlib: from 2.9.0 before 2.22.0.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Azure Linux:3 rabbitmq-server0 → 3.13.7-8

How to fix AZL-90162

  • Upgrade

    AZL-90162 lists a fix boundary at 3.13.7-8. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 3.13.7-8

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for AZL-90162. A missing EPSS score is not a low risk. Compare affecting package rabbitmq-server for with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0 → 3.13.7-8. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

RabbitMQ security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 8, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in ninenines cowlib allows HTTP response splitting via non-VCHAR bytes in structured-fields string values. cow_http_struct_hd:escape_string/2 in cowlib only escapes \ and ", passing all other bytes through verbatim. This creates an encoder/decoder asymmetry: the matching parser accepts only

  2. Nov 10, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    rabbitmq-server fixed in 3.13.7-8

  3. Nov 10, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    rabbitmq-server fixed in 3.13.7-8

  4. Nov 10, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in ninenines cowlib allows HTTP response splitting via non-VCHAR bytes in structured-fields string values. cow_http_struct_hd:escape_string/2 in cowlib only escapes \ and ", passing all other bytes through verbatim. This creates an encoder/decoder asymmetry: the matching parser accepts only

Sources

References

Freshness

Last verified in this catalog Nov 10, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • OpenSSF OSV / OSV ScannerNov 11, 2026