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CVE-2026-18588

A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ef792f749f625b92aad275f66ee8566cfbd00d0c2d695392b73d7a4da7df3fdb
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 4 assertions

{"metric":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C","version":"3.0"},"metric_type":"cvssV3_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/metrics/2/cvssV3_0

{"metric":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"baseScore":10,"vectorString":"AV:N/AC:L/Au:N/C:C/I:C/A:C/E:ND/RL:OF/RC:C","version":"2.0"},"metric_type":"cvssV2_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/metrics/3/cvssV2_0

{"metric":{"baseScore":9.3,"baseSeverity":"CRITICAL","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X","version":"4.0"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/metrics/0/cvssV4_0
cwe · 2 assertions

{"cweId":"CWE-121","description":"Stack-based Buffer Overflow","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-119","description":"Memory Corruption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"cpes":["cpe:2.3:o:wavlink:wl-nu516u1_firmware:*:*:*:*:*:*:*:*"],"product":"WL-NU516U1","vendor":"Wavlink","versions":[{"status":"affected","version":"708c073-mt7628"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/affected/0

Provider-owned CVSS observations

4 source assertions
{"metric":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/metrics/2/cvssV3_0
{"metric":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"baseScore":10,"vectorString":"AV:N/AC:L/Au:N/C:C/I:C/A:C/E:ND/RL:OF/RC:C","version":"2.0"},"metric_type":"cvssV2_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/metrics/3/cvssV2_0
{"metric":{"baseScore":9.3,"baseSeverity":"CRITICAL","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-121","description":"Stack-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-119","description":"Memory Corruption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/problemTypes/1/descriptions/0

Source references

7 source assertions
{"tags":["broken-link","patch"],"url":"https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/references/5
{"tags":["broken-link"],"url":"https://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.md"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/references/4
{"name":"CVE-2026-18588 | CVE Analysis and Report","tags":["third-party-advisory"],"url":"https://vuldb.com/cve/CVE-2026-18588"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/references/2
{"name":"Submit #850500 | WAVLINK WL-NU516U1 2026-05-15 (build 708c073-mt7628) Command Injection","tags":["third-party-advisory"],"url":"https://vuldb.com/submit/850500"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/references/3
{"tags":["exploit"],"url":"https://vuldb.com/submit/850500"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/adp/0/references/0
{"name":"VDB-385416 | Wavlink WL-NU516U1 nas.cgi fgets stack-based overflow","tags":["vdb-entry","technical-description"],"url":"https://vuldb.com/vuln/385416"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/references/0
{"name":"VDB-385416 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"],"url":"https://vuldb.com/vuln/385416/cti"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:674ffa19b4e55f90037ee13f5bf4e5ac72b125a410d39df1df36e17ea81b391a · sha256:6bc6d61180ea9005… · /containers/cna/references/1

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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