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
Published Mar 11, 2021
9.8
CRITICALCVSS 3.1
EPSS 1.38%
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.
Affected products
-
- Version 4.33.0StatusaffectedConstraints<unspecified
- Version 4.57.0StatusaffectedConstraints-
- Version 4.58.0StatusaffectedConstraints<unspecified
- Version 4.59.0StatusaffectedConstraints-
- Version 4.60.0StatusaffectedConstraints-
- Version 4.61.0StatusaffectedConstraints-
- Version 4.62.0StatusaffectedConstraints-
- Version unspecifiedStatusaffectedConstraints<4.32.3
- Version 4.32.3StatusunaffectedConstraints<unspecified
- Version 4.56.1StatusunaffectedConstraints<unspecified
- Version 4.57.1StatusunaffectedConstraints<unspecified
- Version 4.58.2StatusunaffectedConstraints<unspecified
- Version 4.59.1StatusunaffectedConstraints<unspecified
- Version 4.60.1StatusunaffectedConstraints<unspecified
- Version 4.61.1StatusunaffectedConstraints<unspecified
- Version 4.62.1StatusunaffectedConstraints<unspecified
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HHVM | n/a |
|
- < 4.32.3
- ≥ 4.33.0 · < 4.56.1
- 4.57.0
- 4.58.0
- 4.58.1
- 4.59.0
- 4.60.0
- 4.61.0
- 4.62.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.38% (0.01384) | 71.19th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.38% (0.01384) | 68.54th | v5 (v2026.06.15) |
| Mar 29, 2025 | 1.63% (0.01626) | 70.34th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.24% (0.00244) | 64.91th | v3 (v2023.03.01) |
| May 7, 2024 | 0.24% (0.00244) | 64.31th | v3 (v2023.03.01) |
| Nov 24, 2023 | 0.24% (0.00244) | 62.31th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.22% (0.00221) | 58.47th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 9.03% (0.09029) | 86.86th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.74% (0.02742) | 63.06th | v1 |
| Jan 6, 2022 | 2.74% (0.02742) | 62.72th | v1 |
| Jan 5, 2022 | 0.62% (0.00624) | 46.35th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
References (2)
- https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3 x_refsource_MISCPatchThird Party Advisory
- https://hhvm.com/blog/2020/06/30/security-update.html x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3 | x_refsource_MISCPatchThird Party Advisory | |
| https://hhvm.com/blog/2020/06/30/security-update.html | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.