Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [day] [month] [year] [list]
Date: Tue, 5 Dec 2023 12:51:07 -0800
From: Alan Coopersmith <>
Subject: Security fixes in Go 1.21.5 and Go 1.20.12 releases reports:

Hello gophers,

We have just released Go versions 1.21.5 and 1.20.12, minor point releases.

These minor releases include 3 security fixes following the security policy:

   - net/http: limit chunked data overhead

     A malicious HTTP sender can use chunk extensions to cause a receiver reading
     from a request or response body to read many more bytes from the network
     than are in the body.

     A malicious HTTP client can further exploit this to cause a server to
     automatically read a large amount of data (up to about 1GiB) when a handler
     fails to read the entire body of a request.

     Chunk extensions are a little-used HTTP feature which permit including
     additional metadata in a request or response body sent using the chunked
     encoding. The net/http chunked encoding reader discards this metadata.
     A sender can exploit this by inserting a large metadata segment with each
     byte transferred. The chunk reader now produces an error if the ratio of
     real body to encoded bytes grows too small.

     Thanks to Bartek Nowotarski for reporting this issue.

     This is CVE-2023-39326 and Go issue

   - cmd/go: go get may unexpectedly fallback to insecure git

     Using go get to fetch a module with the ".git" suffix may unexpectedly
     fallback to the insecure "git://" protocol if the module is unavailable via
     the secure "https://" and "git+ssh://" protocols, even if GOINSECURE is not
     set for said module. This only affects users who are not using the module
     proxy and are fetching modules directly (i.e. GOPROXY=off).

     Thanks to David Leadbeater for reporting this issue.

     This is CVE-2023-45285 and Go issue

   - path/filepath: retain trailing \ when cleaning paths like \\?\c:\

     Go 1.20.11 and Go 1.21.4 inadvertently changed the definition of the volume
     name in Windows paths starting with \\?\, resulting in
     filepath.Clean(\\?\c:\) returning \\?\c: rather than \\?\c:\ (among other
     effects). The previous behavior has been restored.

     This is an update to CVE-2023-45283 and Go issue

View the release notes for more information:

You can download binary and source distributions from the Go website:

To compile from source using a Git clone, update to the release with
git checkout go1.21.5 and build as usual.

Thanks to everyone who contributed to the releases.

Carlos and Dmitri for the Go team

         -Alan Coopersmith-       
          Oracle Solaris Engineering -

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.