CVE-2022-35289Network attack vector

Arbitrary code execution via write-what-where overflow

Published Oct 11, 2022 · Updated Aug 3, 2024

Integer overflow in Meta Platforms, Inc. Hermes before 0.12.0 allows remote attackers to execute arbitrary code via crafted JavaScript. IdentifierHashTable::growAndRehash used an overflowed capacity calculation, creating a write-what-where condition that enables memory corruption. Exploitation requires an application to evaluate attacker-controlled JavaScript; applications that never process untrusted scripts are not exposed.

CVSS severity9.8
Critical
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Meta Platforms, Inc. Hermes before 0.12.0 allows remote attackers to execute arbitrary code via crafted JavaScript. IdentifierHashTable::growAndRehash used an overflowed capacity calculation, creating a write-what-where condition that enables memory corruption. Exploitation requires an application to evaluate attacker-controlled JavaScript; applications that never process untrusted scripts are not exposed.

The record

CVE
CVE-2022-35289
Published
Oct 11, 2022
Updated
Aug 3, 2024
Vendor
Meta Platforms, Inc.
Product
Hermes
Classifications
CWE-190, CWE-680, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <prior to commit 5b6255ae049fa4641791e47fad994e8e8c4da374

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meta Platforms, Inc. · Hermesversion=unspecified <prior to commit 5b6255ae049fa4641791e47fad994e8e8c4da374

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CWE-680Integer Overflow to Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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