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CVE-2021-21238 · cross-distro fix matrix

CVE-2021-21238: PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping beca

Affects 8 Linux releases across 8 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-21238 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • python-pysaml2→ fixed in6.5.1-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y python-pysaml2

Debian bookworm

Source: Debian Security Tracker

  • python-pysaml2→ fixed in6.5.1-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y python-pysaml2

Debian trixie

Source: Debian Security Tracker

  • python-pysaml2→ fixed in6.5.1-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y python-pysaml2

Alpine v3.20

Source: Alpine secdb

  • py3-saml2→ fixed in6.5.0-r0
    apk update && apk add --upgrade py3-saml2

Alpine v3.21

Source: Alpine secdb

  • py3-saml2→ fixed in6.5.0-r0
    apk update && apk add --upgrade py3-saml2

Alpine edge

Source: Alpine secdb

  • py3-saml2→ fixed in6.5.0-r0
    apk update && apk add --upgrade py3-saml2

Alpine v3.18

Source: Alpine secdb

  • py3-saml2→ fixed in6.5.0-r0
    apk update && apk add --upgrade py3-saml2

Alpine v3.19

Source: Alpine secdb

  • py3-saml2→ fixed in6.5.0-r0
    apk update && apk add --upgrade py3-saml2
Are YOU affected by CVE-2021-21238?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash
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