CVE Explorer
CVE-2026-25899
Fiber is an Express inspired web framework written in Go. In versions on the v3 branch prior to 3.1.0, the use of the `fiber_flash` cookie can force an unbounded allocation on any server. A crafted 10-character cookie value triggers an attempt to allocate up to 85GB of memory via unvalidated msgpack deserialization. No authentication is required. Every GoFiber v3 endpoint is affected regardless of whether the application uses flash messages. Version 3.1.0 fixes the issue.
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, < 3.1.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:d33d2d348af59565418cd8a7b318dcb360983cf7c5c35e4ca2d07bdd49ed58f1 · sha256:68684717075f386b… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:d33d2d348af59565418cd8a7b318dcb360983cf7c5c35e4ca2d07bdd49ed58f1 · sha256:68684717075f386b… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-789","description":"CWE-789: Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:d33d2d348af59565418cd8a7b318dcb360983cf7c5c35e4ca2d07bdd49ed58f1 · sha256:68684717075f386b… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"name":"https://github.com/gofiber/fiber/releases/tag/v3.1.0","tags":["x_refsource_MISC"],"url":"https://github.com/gofiber/fiber/releases/tag/v3.1.0"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:d33d2d348af59565418cd8a7b318dcb360983cf7c5c35e4ca2d07bdd49ed58f1 · sha256:68684717075f386b… · /containers/cna/references/1
{"name":"https://github.com/gofiber/fiber/security/advisories/GHSA-2mr3-m5q5-wgp6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/gofiber/fiber/security/advisories/GHSA-2mr3-m5q5-wgp6"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:d33d2d348af59565418cd8a7b318dcb360983cf7c5c35e4ca2d07bdd49ed58f1 · sha256:68684717075f386b… · /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.