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CVE-2026-2016

A security vulnerability has been detected in happyfish100 libfastcommon up to 1.0.84. Affected by this vulnerability is the function base64_decode of the file src/base64.c. The manipulation leads to stack-based buffer overflow. Local access is required to approach this attack. The exploit has been disclosed publicly and may be used. The identifier of the patch is 82f66af3e252e3e137dba0c3891570f085e79adf. Applying a patch is the recommended action to fix this issue.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f8be3f5ad9a0b4141e687b4ae80352e559b21c82e512e0d0aa1b23b73fa9e014
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":4.8,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","version":"3.0"},"metric_type":"cvssV3_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/metrics/2/cvssV3_0

{"metric":{"baseScore":4.3,"vectorString":"AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C","version":"2.0"},"metric_type":"cvssV2_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/metrics/3/cvssV2_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:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /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:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"libfastcommon","vendor":"happyfish100","versions":[{"status":"affected","version":"1.0.0"},{"status":"affected","version":"1.0.1"},{"status":"affected","version":"1.0.2"},{"status":"affected","version":"1.0.3"},{"status":"affected","version":"1.0.4"},{"status":"affected","version":"1.0.5"},{"status":"affected","version":"1.0.6"},{"status":"affected","version":"1.0.7"},{"status":"affected","version":"1.0.8"},{"status":"affected","version":"1.0.9"},{"status":"affected","version":"1.0.10"},{"status":"affected","version":"1.0.11"},{"status":"affected","version":"1.0.12"},{"status":"aff…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/affected/0

Provider-owned CVSS observations

4 source assertions
{"metric":{"baseScore":4.8,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/metrics/2/cvssV3_0
{"metric":{"baseScore":4.3,"vectorString":"AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C","version":"2.0"},"metric_type":"cvssV2_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/metrics/3/cvssV2_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:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /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:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/problemTypes/1/descriptions/0

Source references

8 source assertions
{"tags":["product"],"url":"https://github.com/happyfish100/libfastcommon/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/references/7
{"tags":["patch"],"url":"https://github.com/happyfish100/libfastcommon/commit/82f66af3e252e3e137dba0c3891570f085e79adf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/references/6
{"tags":["issue-tracking"],"url":"https://github.com/happyfish100/libfastcommon/issues/55"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/references/3
{"tags":["exploit","issue-tracking"],"url":"https://github.com/happyfish100/libfastcommon/issues/55#issue-3836362577"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/references/5
{"tags":["issue-tracking"],"url":"https://github.com/happyfish100/libfastcommon/issues/55#issuecomment-3776757848"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/references/4
{"name":"VDB-344598 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"],"url":"https://vuldb.com/?ctiid.344598"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/references/1
{"name":"VDB-344598 | happyfish100 libfastcommon base64.c base64_decode stack-based overflow","tags":["vdb-entry","technical-description"],"url":"https://vuldb.com/?id.344598"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /containers/cna/references/0
{"name":"Submit #743873 | happyfish100 libfastcommon V1.0.84 and earlier Heap-based Buffer Overflow","tags":["third-party-advisory"],"url":"https://vuldb.com/?submit.743873"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d5ff750d2cf2fd8ee19cfbfa956ec211b9a08166ffc0b8bdf2163945a38c33e9 · sha256:fb0e2c07f652ca15… · /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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