An open API service providing security vulnerability metadata for many open source software ecosystems.

Security Advisories: GSA_kwCzR0hTQS1meDJjLTk2dmotOTg1ds4AAwRn

HAProxyMessageDecoder Stack Exhaustion DoS


A StackOverflowError can be raised when parsing a malformed crafted message due to an infinite recursion.


Users should upgrade to 4.1.86.Final.


There is no workaround, except using a custom HaProxyMessageDecoder.


When parsing a TLV with type = PP2_TYPE_SSL, the value can be again a TLV with type = PP2_TYPE_SSL and so on. The only limitation of the recursion is that the TLV length cannot be bigger than 0xffff because it is encoded in an unsigned short type. Providing a TLV with a nesting level that is large enough will lead to raising of a StackOverflowError. The StackOverflowError will be caught if HAProxyMessageDecoder is used as part of Netty’s ChannelPipeline, but using it directly without the ChannelPipeline will lead to a thrown exception / crash.

For more information

If you have any questions or comments about this advisory:

Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 6 months ago
Updated: 4 months ago

CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Identifiers: GHSA-fx2c-96vj-985v, CVE-2022-41881

Affected Packages

Versions: < 4.1.86.Final
Fixed in: 4.1.86.Final