CVE-2026-40991: When using spring-restdocs-webtestclient or spring-restdocs-restassured to document a remote API accessed over

Routine

MEDIUM 5.9UPGRADE

CVE-2026-40991 is a medium-severity flaw (CVSS 5.9) affecting spring rest docs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

When using spring-restdocs-webtestclient or spring-restdocs-restassured to document a remote API accessed over HTTP, an attacker who compromises the API or tricks the user into documenting a malicious API can perform an XXE injection attack when the documentation-generating tests are next executed. Affected versions: Spring REST Docs 4.0.0; 3.0.0 through 3.0.5; 2.0.0.RELEASE through 2.0.8.RELEASE.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-611
Published	2026-06-10
Last modified	2026-07-23

Publisher (CNA): VMware · Vendor: broadcom

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-10 00:16 UTCPublished CVE record published
2026-07-23 09:10 UTCUpdated Record last modified

broadcom spring rest docs UPGRADE

Affected: >= 2.0.0 and < 2.0.9 · >= 3.0.0 and < 3.0.5.1 · 4.0.0

Fixed in: 2.0.9, 3.0.5.1

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy spring-rest-docs || rpm -q spring-rest-docs || spring-rest-docs --version

2. UPGRADE to 2.0.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade spring-rest-docs

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spring-rest-docs

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison spring-rest-docs sudo apt install spring-rest-docs=<VERSION_BEFORE_2.0.0> sudo apt-mark hold spring-rest-docs

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list spring-rest-docs sudo dnf downgrade spring-rest-docs-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add spring-rest-docs

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40991?

spring rest docs: upgrade to 2.0.9, 3.0.5.1. Exact commands for each OS are on this page.

Is CVE-2026-40991 being exploited?

CVE-2026-40991 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40991 affect?

CVE-2026-40991 affects spring rest docs. Severity is medium (CVSS 5.9). When using spring-restdocs-webtestclient or spring-restdocs-restassured to document a remote API accessed over HTTP, an attacker who compromises the API or tricks the user into documenting a malicious API can perform an XXE injection attack

How urgent is CVE-2026-40991?

Priority 24/100. No elevated risk signals yet.

References

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