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CVE-2020-1900
When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before…
Critical9.8EPSS 1.4%
- Published
- Updated
- Reserved
- Assigned by
Description
When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before inserting anything into it. Otherwise the array might resize, invalidating previously stored references. This pre-reservation was not occurring in HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.4% · top 28% of all CVEs (4 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
Affected products
- unaffected 4.62.1 – < unspecified
- affected 4.62.0
- unaffected 4.61.1 – < unspecified
- affected 4.61.0
- unaffected 4.60.1 – < unspecified
- affected 4.60.0
- unaffected 4.59.1 – < unspecified
- affected 4.59.0
- unaffected 4.58.2 – < unspecified
- affected 4.58.0 – < unspecified
- unaffected 4.57.1 – < unspecified
- affected 4.57.0
- unaffected 4.56.1 – < unspecified
- affected 4.33.0 – < unspecified
- unaffected 4.32.3 – < unspecified
- affected unspecified – < 4.32.3
References (2)
- https://hhvm.com/blog/2020/06/30/security-update.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2020-1900)Record last updated .