CVE Explorer
CVE-2026-47736
Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, when PROXY protocol v1 support is enabled, Puma reads incoming bytes into an internal buffer while waiting for CRLF to determine whether a PROXY v1 line is present, allowing an attacker that continuously sends bytes without CRLF to cause unbounded in-process memory growth and additional CPU cost from repeatedly scanning the growing buffer. This issue is fixed in versions 7.2.1 and 8.0.2.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"puma","vendor":"puma","versions":[{"status":"affected","version":">= 5.5.0, < 7.2.1"},{"status":"affected","version":">= 8.0.0, < 8.0.2"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:7ca3ca1e359a2d252c697e289aeb65d131cddf94683ec7da0863bea336a3c5a0 · sha256:1762981bbb2cccfe… · /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:v2:7ca3ca1e359a2d252c697e289aeb65d131cddf94683ec7da0863bea336a3c5a0 · sha256:1762981bbb2cccfe… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:7ca3ca1e359a2d252c697e289aeb65d131cddf94683ec7da0863bea336a3c5a0 · sha256:1762981bbb2cccfe… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"name":"https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f","tags":["x_refsource_MISC"],"url":"https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7ca3ca1e359a2d252c697e289aeb65d131cddf94683ec7da0863bea336a3c5a0 · sha256:1762981bbb2cccfe… · /containers/cna/references/1
{"name":"https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58","tags":["x_refsource_MISC"],"url":"https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7ca3ca1e359a2d252c697e289aeb65d131cddf94683ec7da0863bea336a3c5a0 · sha256:1762981bbb2cccfe… · /containers/cna/references/2
{"name":"https://github.com/puma/puma/releases/tag/v7.2.1","tags":["x_refsource_MISC"],"url":"https://github.com/puma/puma/releases/tag/v7.2.1"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7ca3ca1e359a2d252c697e289aeb65d131cddf94683ec7da0863bea336a3c5a0 · sha256:1762981bbb2cccfe… · /containers/cna/references/3
{"name":"https://github.com/puma/puma/releases/tag/v8.0.2","tags":["x_refsource_MISC"],"url":"https://github.com/puma/puma/releases/tag/v8.0.2"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7ca3ca1e359a2d252c697e289aeb65d131cddf94683ec7da0863bea336a3c5a0 · sha256:1762981bbb2cccfe… · /containers/cna/references/4
{"name":"https://github.com/puma/puma/security/advisories/GHSA-qpgp-93vx-g8v8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/puma/puma/security/advisories/GHSA-qpgp-93vx-g8v8"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7ca3ca1e359a2d252c697e289aeb65d131cddf94683ec7da0863bea336a3c5a0 · sha256:1762981bbb2cccfe… · /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.