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CVE-2026-45045

Fiber is an Express inspired web framework written in Go. Prior to 3.3.0 and 2.52.14, the BalancerForward proxy helper in middleware/proxy/proxy.go uses Header.Add() instead of Header.Set() when injecting X-Real-IP, allowing an attacker-supplied first X-Real-IP value to be forwarded to upstream servers for logging, rate limiting, and access control. This issue is fixed in version 3.3.0 and 2.52.14.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8365579f21ddd72a602058edc4f6e4b5bcecd2345c425489abb782a9d5a7e8aa
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"fiber","vendor":"gofiber","versions":[{"status":"affected","version":">= 3.0.0-beta.2, < 3.3.0"},{"status":"affected","version":"< 2.52.14"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"name":"https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396","tags":["x_refsource_MISC"],"url":"https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/references/3
{"name":"https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d","tags":["x_refsource_MISC"],"url":"https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/references/4
{"name":"https://github.com/gofiber/fiber/pull/4260","tags":["x_refsource_MISC"],"url":"https://github.com/gofiber/fiber/pull/4260"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/references/1
{"name":"https://github.com/gofiber/fiber/pull/4495","tags":["x_refsource_MISC"],"url":"https://github.com/gofiber/fiber/pull/4495"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/references/2
{"name":"https://github.com/gofiber/fiber/releases/tag/v2.52.14","tags":["x_refsource_MISC"],"url":"https://github.com/gofiber/fiber/releases/tag/v2.52.14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/references/5
{"name":"https://github.com/gofiber/fiber/releases/tag/v3.3.0","tags":["x_refsource_MISC"],"url":"https://github.com/gofiber/fiber/releases/tag/v3.3.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/references/6
{"name":"https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876","tags":["x_refsource_CONFIRM"],"url":"https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a7948f05d4a5d124bbf334cb71a8681a887249c04909270bda0d082f9bcaa53b · sha256:a815f1aff2676c2d… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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