CVE-2026-90771Low· 3.7▾ TwilightPoC availablejoi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilation function that accepts __proto__ as an error code. Attackers can supply __proto__ keys in custom messages to replace the retur…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 20.4 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
3.7 → 5.9
low → medium
0.3%
Exploit / PoC code exists
5.9 → 3.7
medium → low
Last analysed / modified upstream
0.3% → 0.4%
joi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilation function that accepts proto as an error code. Attackers can supply proto keys in custom messages to replace the returned object's prototype, breaking downstream code relying on Object.prototype methods.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
joi < 17.13.8joi >= 18.0.0, < 18.2.9Patched in:
joi 17.13.8joi 18.2.9Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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