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CVE-2026-56813

Improper Neutralization of Parameter/Argument Delimiters vulnerability in elixir-plug plug allows an attacker to inject or override HTTP cookie attributes. The Plug.Conn.Cookies.encode/2 function in lib/plug/conn/cookies.ex builds the Set-Cookie response header by interpolating the cookie value and its path, domain, same_site, and extra attributes directly into the header without neutralizing the ';' delimiter that separates cookie attributes. An application that places attacker-controlled dat
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1dd92c02669074924c560492650336b5381f89a74f8df328466c00ca30775b39
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Plug.Conn.Cookies'","'Elixir.Plug.Conn'"],"packageName":"elixir-plug/plug","packageURL":"pkg:github/elixir-plug/plug","product":"plug","programFiles":["lib/plug/conn/cookies.ex"],"programRoutines":[{"name":"'Elixir.Plug.Conn.Cookies':encode/2"},{"name":"'Elixir.Plug.Conn':put_resp_cookie/4"}],"repo":"https://github.com/elixir-plug/plug","vendor":"elixir-plug","versions":[{"changes":[{"at":"3f00dfad4e20ba88472e315c90a25742bf178f8e","status":"unaffected"},{…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/affected/1

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Plug.Conn.Cookies'","'Elixir.Plug.Conn'"],"packageName":"plug","packageURL":"pkg:hex/plug","product":"plug","programFiles":["lib/plug/conn/cookies.ex"],"programRoutines":[{"name":"'Elixir.Plug.Conn.Cookies':encode/2"},{"name":"'Elixir.Plug.Conn':put_resp_cookie/4"}],"repo":"https://github.com/elixir-plug/plug","vendor":"elixir-plug","versions":[{"lessThan":"1.16.6","status":"affected","version":"0.1.0","versionType":"semver"},{"lessThan":"1.17.4","status…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Plug.Conn.Cookies'","'Elixir.Plug.Conn'"],"packageName":"elixir-plug/plug","packageURL":"pkg:github/elixir-plug/plug","product":"plug","programFiles":["lib/plug/conn/cookies.ex"],"programRoutines":[{"name":"'Elixir.Plug.Conn.Cookies':encode/2"},{"name":"'Elixir.Plug.Conn':put_resp_cookie/4"}],"repo":"https://github.com/elixir-plug/plug","vendor":"elixir-plug","versions":[{"changes":[{"at":"3f00dfad4e20ba88472e315c90a25742bf178f8e","status":"unaffected"},{…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/affected/1
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Plug.Conn.Cookies'","'Elixir.Plug.Conn'"],"packageName":"plug","packageURL":"pkg:hex/plug","product":"plug","programFiles":["lib/plug/conn/cookies.ex"],"programRoutines":[{"name":"'Elixir.Plug.Conn.Cookies':encode/2"},{"name":"'Elixir.Plug.Conn':put_resp_cookie/4"}],"repo":"https://github.com/elixir-plug/plug","vendor":"elixir-plug","versions":[{"lessThan":"1.16.6","status":"affected","version":"0.1.0","versionType":"semver"},{"lessThan":"1.17.4","status…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":2.1,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-141","description":"CWE-141 Improper Neutralization of Parameter/Argument Delimiters","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-56813.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/elixir-plug/plug/commit/c6575800b2c4e15af1904df87522ca8a23da020c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/references/3
{"tags":["vendor-advisory","related"],"url":"https://github.com/elixir-plug/plug/security/advisories/GHSA-wpmj-jh88-rpgm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-56813"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2b2eb3ea85fc6c7e2e58cc92fe870cfda3008b24f10c5795f99870ccb017d88c · sha256:70b4a47e8db7400f… · /containers/cna/references/2

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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