Bug#995926: Error validating Let's Encrypt cert chains

[Andreas Metzler]

X-Debbugs-Cc: Andre Heider <a.heider at gmail.com>, lftp at packages.debian.org

On 2021-10-08 Andre Heider <a.heider at gmail.com> wrote:
> Source: gnutls28
> Version: 3.7.2-2

> Apps using gnutls fail to connect to servers using a Let's Encrypt
> certificate which are cross-signed by the now expired DST Root CA X3, see
> [0].

> Examples:

> $ lftp https://shop.bbc.com
> cd: Fatal error: Certificate verification: Not trusted
> (93:3C:6D:DE:E9:5C:9C:41:A4:0F:9F:50:49:3D:82:BE:03:AD:87:BF)
[...]
> [0] https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/

Hello,

given that 
gnutls-cli --port https shop.bbc.com
works I suspect that it is not necessarily a GnuTLS problem.

cu Andreas
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