vulnerability / NVI-00013858 / Revision 2
RabbitMQ amqp091-go: Protocol Desynchronization and Frame Injection via Integer Overflow in readLongstr
GitHub lists this reviewed advisory for github.com/rabbitmq/amqp091-go. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
0.524%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.44421. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
github.com/rabbitmq/amqp091-go
source listed< 1.13.0
**Summary** A critical stream desynchronization vulnerability has been identified in the AMQP wire-protocol parser. When parsing a long string (`readLongstr`) within a table field, providing a length that exceeds the maximum signed 32-bit integer (`2^31 - 1`, or roughly `2.1` GiB) triggers an improper error-handling condition. The parser abruptly aborts the read and returns a success status (`"",nil`) without consuming the specified bytes from the underlying network buffer. This causes all subsequent read operations to become misaligned. The parser interprets arbitrary offsets within the remaining payload bytes as valid AMQP frame headers, leading to potential Remote Code Execution (RCE), data injection, or complete connection hijacking. **Vulnerability Details** The vulnerability exists within the bounds-checking logic of the readLongstr function: ```go // read.go:113-114 — silent no-op return, bytes left in stream if length > (^uint32(0) >> 1) { return // returns "", nil, does NOT consume `length` bytes } ``` When `length` evaluates to a value greater than `0x7FFFFFFF`: 1. The function executes a silent `return` statement. 2. Because Go utilizes named or zero-value initi
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-c5pq-fr2g-9jpf ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
- CVE-2026-77411 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.