CVE-2026-92842 PHP Group CVE debrief

Who should care

Defenders responsible for systems using the affected product should assess exposure and implement compensating controls. They should prioritize verifying the affected product and versions, assessing exposure, and implementing compensating controls due to the potential for adjacent heap bytes to be placed into the filter output. This includes operators, platform administrators, vulnerability managers, and security teams who need to verify affected scope,

Why it matters

Defenders should prioritize verifying the affected product and versions, assessing exposure, and implementing compensating controls due to the potential for adjacent heap bytes to be placed into the filter output.

• Verify affected product and versions to assess exposure
• Implement compensating controls to prevent potential exploitation
• Monitor for potential exploitation attempts

Technical summary

The convert.base64-encode, convert.quoted-printable-encode, and convert.quoted-printable-decode stream filters have a vulnerability related to the line-break-chars option. The filter constructors duplicate the value with pestrdup(), which stops at the first NUL byte, while keeping the original length. When the filter later emits a line break, it copies the recorded length out of the truncated allocation, reading past its end and placing adjacent heap bytes into the filter output.

Defensive priority

Defenders should prioritize verifying the affected product and versions, assessing exposure, and implementing compensating controls.

Recommended defensive actions

• Verify the affected product and versions
• Assess exposure and implement compensating controls
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD vulnerability detail page provide information about the vulnerability. However, the affected product and versions are not specified, requiring further verification by defenders. They should verify the affected product and versions, assess exposure, and implement compensating controls. The vulnerability exists in the convert.base64-encode, convert.quoted-printable-encode, and convert.quoted-printable-decode stream filters. The filter constructors duplicate the value with pestrdup(), which stops at the first NUL,

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.