{"answers":{"affected":"3 open source packages ship an affected version, including github.com/gofiber/fiber/v3. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-25899 in the wild and no public exploit code.","fix":"Upgrade github.com/gofiber/fiber/v3 to 3.1.0 or later.","what":"CVE-2026-25899 is a high-severity denial of service vulnerability in gofiber fiber, published on 24 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-25899 and fix it if it is affected.\n\nWhat it is: CVE-2026-25899 is a high-severity denial of service vulnerability in gofiber fiber, published on 24 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-25899 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/gofiber/fiber/v3 (Go): affected all versions; fixed in 3.1.0\n- github.com/gofiber/fiber/v3 (Go): affected all versions; fixed in 3.1.0\n- github.com/gofiber/fiber/v3 (Go): affected all versions; fixed in 3.1.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-25899/ (Markdown: https://insights.sbomify.com/CVE-2026-25899/index.md)","id":"CVE-2026-25899","markdown":"https://insights.sbomify.com/CVE-2026-25899/index.md","name":"CVE-2026-25899","record":{"aliases":["GHSA-2mr3-m5q5-wgp6","GO-2026-4534"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Go web framework","requires_auth":"none","summary":"An attacker can cause a denial of service by sending a crafted cookie that triggers unbounded memory allocation in the Fiber web framework.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"fiber","vendor":"gofiber"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-789","name":"Memory Allocation with Excessive Size Value"}],"description":"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.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Fiber is Vulnerable to Denial of Service via Flash Cookie Unbounded Allocation","id":"CVE-2026-25899","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"Joomla! Core - [20260501] - XSS in feed modules","id":"CVE-2026-25900"},"packages":[{"ecosystem":"Go","fixed":["3.1.0"],"introduced":["0"],"last_affected":[],"package":"github.com/gofiber/fiber/v3","purl":null,"source":"GHSA-2mr3-m5q5-wgp6"},{"ecosystem":"Go","fixed":["3.1.0"],"introduced":["0"],"last_affected":[],"package":"github.com/gofiber/fiber/v3","purl":"pkg:golang/github.com/gofiber/fiber/v3","source":"GHSA-2mr3-m5q5-wgp6"},{"ecosystem":"Go","fixed":["3.1.0"],"introduced":["0"],"last_affected":[],"package":"github.com/gofiber/fiber/v3","purl":"pkg:golang/github.com/gofiber/fiber/v3","source":"GO-2026-4534"}],"prev":{"headline":"Imagemagick Has Global Buffer Overflow (OOB Read) via Negative Pixel Index in UIL and XPM Writer","id":"CVE-2026-25898"},"products":["fiber"],"published":"2026-02-24","related":[{"cvss_score":10,"headline":"Fiber Session Middleware Token Injection Vulnerability","id":"CVE-2024-38513","kev_date_added":null,"published":"2024-07-01"},{"cvss_score":10,"headline":"CSRF Token Reuse Vulnerability in fiber","id":"CVE-2023-45128","kev_date_added":null,"published":"2023-10-16"},{"cvss_score":9.4,"headline":"Fiber has Insecure CORS Configuration, Allowing Wildcard Origin with Credentials","id":"CVE-2024-25124","kev_date_added":null,"published":"2024-02-21"},{"cvss_score":9.2,"headline":"Fiber insecurely fallsback in utils.UUIDv4() / utils.UUID() — predictable / zero‑UUID on crypto/rand failure","id":"CVE-2025-66630","kev_date_added":null,"published":"2026-02-09"},{"cvss_score":8.7,"headline":"Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder","id":"CVE-2025-54801","kev_date_added":null,"published":"2025-08-05"},{"cvss_score":8.6,"headline":"CSRF Token Validation Vulnerability in fiber","id":"CVE-2023-45141","kev_date_added":null,"published":"2023-10-16"},{"cvss_score":7.7,"headline":"Fiber has an Arbitrary File Read in Static Middleware on Windows","id":"CVE-2026-25891","kev_date_added":null,"published":"2026-02-24"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-02-24","vendors":["gofiber"]},"summary":"An attacker can cause a denial of service by sending a crafted cookie that triggers unbounded memory allocation in the Fiber web framework.","url":"https://insights.sbomify.com/CVE-2026-25899/"}