GHSA-68mj-5wr7-6fgg

Suggest an improvement
Source
https://github.com/advisories/GHSA-68mj-5wr7-6fgg
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-68mj-5wr7-6fgg/GHSA-68mj-5wr7-6fgg.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-68mj-5wr7-6fgg
Aliases
Downstream
CGA (53)
MINI (12)
Published
2026-08-18T16:32:20Z
Modified
2026-09-10T03:51:13Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
RabbitMQ Java client ValueReader: Oversized LongString/bytes length triggers OOM via unchecked allocation
Details

Summary

ValueReader.readBytes() allocates a byte array sized by a wire-declared content length without validating it against actual frame data. A malicious AMQP peer triggers OOM by declaring a ~2GB string/bytes field.

Vulnerable Code

src/main/java/com/rabbitmq/client/impl/ValueReader.java lines 83-95:

private static byte[] readBytes(final DataInputStream in) throws IOException {
    final long contentLength = unsignedExtend(in.readInt());
    if(contentLength < Integer.MAX_VALUE) {
        final byte[] buffer = new byte[(int)contentLength];  // allocates before reading
        in.readFully(buffer);
        return buffer;
    }
}

Attack Scenario

A malicious AMQP server sends a LongString field (type tag 'S') with declared length 0x7FFFFFFE (2,147,483,646). The check contentLength < Integer.MAX_VALUE passes. new byte[2147483646] attempts ~2GB allocation, causing OutOfMemoryError before readFully() attempts to read data.

The allocation size is attacker-controlled and is NOT validated against the frame size or TruncatedInputStream bounds. Exploitable pre-authentication via connection.start server-properties table.

Impact

Denial of service via JVM OutOfMemoryError. Crashes the entire JVM.

CWE

CWE-789: Memory Allocation with Excessive Size Value

Remediation

Validate contentLength against the frame's remaining bytes or the negotiated max frame size (default 131,072) before allocating.

Database specific 
{
    "cwe_ids":  [
        "CWE-789"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-18T16:32:20Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}
References

Affected packages

Maven / com.rabbitmq:amqp-client

Package

Name
com.rabbitmq:amqp-client
View open source insights on deps.dev
Purl
pkg:maven/com.rabbitmq/amqp-client

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.33.1

Affected versions

1.*
1.3.0
1.5.4
1.5.5
1.6.0
1.7.2
1.8.0
1.8.1
2.*
2.0.0
2.1.0
2.1.1
2.2.0
2.3.0
2.3.1
2.4.1
2.5.0
2.5.1
2.6.0
2.6.1
2.7.0
2.7.1
2.8.0
2.8.1
2.8.2
2.8.3
2.8.4
2.8.5
2.8.6
2.8.7
3.*
3.0.0
3.0.1
3.0.2
3.0.3
3.0.4
3.1.0
3.1.1
3.1.2
3.1.3
3.1.4
3.2.0
3.2.1
3.2.2
3.2.3
3.2.4
3.3.0
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.4.0
3.4.1
3.4.2
3.4.3
3.4.4
3.5.0
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.5.6
3.5.7
3.6.0
3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
4.*
4.0.0
4.0.1
4.0.2
4.0.3
4.1.0
4.1.1
4.2.0
4.2.1
4.2.2
4.3.0
4.4.0
4.4.1
4.4.2
4.5.0
4.6.0
4.7.0
4.8.0
4.8.1
4.8.2
4.8.3
4.9.0
4.9.1
4.9.2
4.9.3
4.10.0
4.11.0
4.11.1
4.11.2
4.11.3
4.12.0
5.*
5.0.0
5.1.0
5.1.1
5.1.2
5.2.0
5.3.0
5.4.0
5.4.1
5.4.2
5.4.3
5.5.0
5.5.1
5.5.2
5.5.3
5.6.0
5.7.0
5.7.1
5.7.2
5.7.3
5.8.0
5.9.0
5.10.0
5.11.0
5.12.0
5.13.0
5.13.1
5.14.0
5.14.1
5.14.2
5.14.3
5.15.0
5.16.0
5.16.1
5.17.0
5.17.1
5.18.0
5.19.0
5.20.0
5.21.0
5.22.0
5.23.0
5.24.0
5.25.0
5.26.0
5.27.0
5.27.1
5.28.0
5.29.0
5.30.0
5.31.0
5.32.0
5.33.0

Database specific

last_known_affected_version_range 
"<= 5.33.0"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-68mj-5wr7-6fgg/GHSA-68mj-5wr7-6fgg.json"