fix(deps): update module github.com/gofiber/fiber/v2 to v2.52.11 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/gofiber/fiber/v2	v2.52.10 → v2.52.11

GitHub Vulnerability Alerts

CVE-2025-66630

Fiber v2 contains an internal vendored copy of gofiber/utils, and its functions UUIDv4() and UUID() inherit the same critical weakness described in the upstream advisory. On Go versions prior to 1.24, the underlying crypto/rand implementation can return an error if secure randomness cannot be obtained. In such cases, these Fiber v2 UUID functions silently fall back to generating predictable values — the all-zero UUID 00000000-0000-0000-0000-000000000000.

On Go 1.24+, the language guarantees that crypto/rand no longer returns an error (it will block or panic instead), so this vulnerability primarily affects Fiber v2 users running Go 1.23 or earlier, which Fiber v2 officially supports.

Because no error is returned by the Fiber v2 UUID functions, application code may unknowingly rely on predictable, repeated, or low-entropy identifiers in security-critical pathways. This is especially impactful because many Fiber v2 middleware components (session middleware, CSRF, rate limiting, request-ID generation, etc.) default to using utils.UUIDv4().

Impact includes, but is not limited to:

• Session fixation or hijacking (predictable session IDs)
• CSRF token forgery or bypass
• Authentication replay / token prediction
• Potential denial-of-service (DoS): if the zero UUID is generated, key-based structures (sessions, rate-limits, caches, CSRF stores) may collapse into a single shared key, causing overwrites, lock contention, or state corruption
• Request-ID collisions, undermining logging and trace integrity
• General compromise of confidentiality, integrity, and authorization logic relying on UUIDs for uniqueness or secrecy

All Fiber v2 versions containing the internal utils.UUIDv4() / utils.UUID() implementation are affected when running on Go <1.24. No patched Fiber v2 release currently exists.

---

Suggested Mitigations / Workarounds

Update to the latest version of Fiber v2.

---

Likelihood / Environmental Factors

It’s important to note that entropy exhaustion on modern Linux systems is extremely rare, as the kernel’s CSPRNG is resilient and non-blocking. However, entropy-source failures — where crypto/rand cannot read from its underlying provider — are significantly more likely in certain environments.

This includes containerized deployments, restricted sandboxes, misconfigured systems lacking read access to /dev/urandom or platform-equivalent sources, chrooted or jailed environments, embedded devices, or systems with non-standard or degraded randomness providers. On Go <1.24, such failures cause crypto/rand to return an error, which the Fiber v2 UUID functions currently treat as a signal to silently generate predictable UUIDs, including the zero UUID. This silent fallback is the root cause of the vulnerability.

---

References

• Upstream advisory for gofiber/utils: GHSA-m98w-cqp3-qcqr

• Source repositories:

  • github.com/gofiber/fiber
  • github.com/gofiber/utils

---

Credits / Reporter

Reported by @​sixcolors (Fiber Maintainer / Security Team)

---

Release Notes

gofiber/fiber (github.com/gofiber/fiber/v2)

v2.52.11

Compare Source

What's Changed

🧹 Updates

• Improve mount functionality by @​gaby in #​3900

🐛 Bug Fixes

• Backport defensive copying fixes from #​3828 and #​3829 to v2 by @​sixcolors in #​3888
• Fixes and improvements for limiter middleware by @​gaby in #​3899

Full Changelog: gofiber/fiber@v2.52.10...v2.52.11

---

Configuration

📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.